Showing papers in "Numerical Heat Transfer Part A-applications in 2009"
TL;DR: In this article, the authors present the results of a numerical study on natural convection heat transfer in an inclined enclosure filled with a water-CuO nanofluid, where two opposite walls of the enclosure are insulated and the other two walls are kept at different temperatures.
Abstract: This article presents the results of a numerical study on natural convection heat transfer in an inclined enclosure filled with a water-CuO nanofluid. Two opposite walls of the enclosure are insulated and the other two walls are kept at different temperatures. The transport equations for a Newtonian fluid are solved numerically with a finite volume approach using the SIMPLE algorithm. The influence of pertinent parameters such as Rayleigh number, inclination angle, and solid volume fraction on the heat transfer characteristics of natural convection is studied. The results indicate that adding nanoparticles into pure water improves its heat transfer performance; however, there is an optimum solid volume fraction which maximises the heat transfer rate. The results also show that the inclination angle has a significant impact on the flow and temperature fields and the heat transfer performance at high Rayleigh numbers. In fact, the heat transfer rate is maximised at a specific inclination angle depending on ...
282 citations
TL;DR: In this paper, the authors describe the implementation and validation of a nucleate boiling model in the volume-of-fluid solver OpenFOAM and demonstrate the growth of a bubble from a heated steel foil.
Abstract: This article describes the implementation and validation of a nucleate boiling model in the volume-of-fluid solver of OpenFOAM. Emphasis is put on the implementation of the contact line evaporation, which can typically not be resolved by the numerical grid, and on the conjugate heat transfer between solid and fluid. For validation, the sucking interface problem and the growth of a spherical bubble have been simulated successfully. In order to validate the contact line model and the conjugate heat transfer, the growth of a bubble from a heated steel foil has been calculated.
223 citations
TL;DR: In this article, a novel sister hole cooling technique using large inclination angle cylindrical holes simulated numerically was proposed to reduce the primary kidney vortex pair with significant improvements in effectiveness at all blowing ratios.
Abstract: The present study evaluates a novel sister hole cooling technique using large inclination angle cylindrical holes simulated numerically. Here, a 55° inclination angle has been applied to simulate more realistic turbine conditions. Two sister holes bound the primary injection hole and are shifted slightly downstream to promote flow adhesion. As a means of determining the validity of the technique, adiabatic effectiveness and vortex flow structures were evaluated at four blowing ratios: 0.2, 0.5, 1.0, and 1.5. The results indicate that the sister hole technique dramatically reduces the primary kidney vortex pair offering significant improvements in effectiveness at all blowing ratios.
56 citations
SIDI1
TL;DR: In this article, the Boubaker polynomial expansion scheme has been applied to the main system solution expressed in cylindrical coordinates and which is solved using the Householder-QR/QL algorithm.
Abstract: In this study, we are concerned with the temperature distribution inside the central nugget during a particular sequence of resistance spot welding (RSW). Numerical calculations are issued from an attempt to solve heat transfer equation inside the heated device. Boubaker polynomial expansion scheme has been applied to the main system solution expressed in cylindrical coordinates and which is solved using the Householder-QR/QL algorithm. The melting point maximal front spatial evolution has been monitored in order to make comparison with precedent results.
53 citations
TL;DR: Bao, K., Wu, E. H., Zhang, H. L., Zheng, L. L. as mentioned in this paper, and Wei, J. A., Zhang and H.L.
Abstract: Bao, K.; Wu, E. H. Chinese Acad Sci, Inst Software, State Key Lab Comp Sci, Beijing, Peoples R China. Fang, H. S.; Wei, J. A.; Zhang, H.; Zheng, L. L. SUNY Stony Brook, Dept Mech Engn, Stony Brook, NY 11794 USA. Zheng, L. L. Tsinghua Univ, Sch Aerosp, Beijing 100084, Peoples R China. Bao, K. Chinese Acad Sci, Grad Univ, Beijing, Peoples R China. Zhang, H. Tsinghua Univ, Dept Engn Phys, Ctr Publ Safety Res, Beijing 100084, Peoples R China. Wu, E. H. Univ Macau, Fac Sci & Technol, Macao, Peoples R China.
44 citations
TL;DR: In this paper, a cylindrical film-cooling hole was optimized by surrogate modeling approach using three-dimensional Reynolds-averaged Navier-Stokes analysis, where SST model has been employed as a turbulence closure model for the analysis of turbulent convective heat transfer.
Abstract: Optimization of a cylindrical film-cooling hole has been performed by surrogate modeling approach using three-dimensional Reynolds-averaged Navier-Stokes analysis. SST model has been employed as a turbulence closure model for the analysis of turbulent convective heat transfer. Spatially-averaged film-cooling effectiveness has been maximized for optimization. For two design variables, the ratio of length to the diameter of the hole and ejection angle, 12 experimental points are selected by Latin hypercube sampling. Performances of three basic surrogate models and three weighted average surrogate models have been evaluated. Among the surrogate models tested, the Kriging model predicts the optimum point with the highest objective function value calculated by Reynolds-averaged Navier-Stokes analysis, which gives a 3.6% improvement of the spatially-averaged film-cooling effectiveness in comparison to the reference geometry. The objective function is more sensitive to the ejection angle than the ratio of length...
44 citations
TL;DR: In this article, the authors studied the dependence of the local and average Nusselt number on the Reynolds number, Prandtl number, and power law index for convection heat transfer to incompressible power law type non-Newtonian fluids.
Abstract: Forced convection heat transfer to incompressible power law type non-Newtonian fluids from a heated square cylinder in the unsteady cross-flow regime has been studied numerically by solving the relevant momentum and thermal energy equations using a finite-volume method for the range of conditions 0.7 ≤ Pr ≤ 50, 60 ≤ Re ≤ 160, and 0.5 ≤ n ≤ 1.8. Over this range of Reynolds numbers, the flow is truly periodic for Newtonian and shear-thickening fluids, while in the case of shear-thinning fluids it becomes pseudo-periodic at high values of Re (≥140) and low values of n(≤ 0.6). This work is concerned only with the truly periodic regime and therefore the range of Reynolds number studied varies with the value of the power law index. The dependence of the local and average Nusselt number on the Reynolds number, Prandtl number, and power law index has been studied in detail. Broadly, shear-thinning (n 1) impedes it. Further insights into the...
43 citations
TL;DR: In this paper, the authors investigated the performance of two models, namely the Brinkman-Forchheimer Darcy model (BFDM) and the BRINKMAN-Extended Darcy Model (BDM), in a problem involving mixed convection in a square cavity filled with a porous medium using the multigrid method.
Abstract: This article investigates the performance of two models; namely the Brinkman-Forchheimer Darcy model (BFDM) and the Brinkman-extended Darcy model (BDM), in a problem involving mixed convection in a square cavity filled with a porous medium using the multigrid method. The left and right walls, moving in opposite directions, are maintained at different constant temperatures, while the top and bottom walls are thermally insulated. The transport equations were solved numerically by the finite-volume method on a colocated grid arrangement using a quadratic upwind interpolation for convective kinematics (QUICK) scheme. The influence of the key parameters, namely the Darcy number (Da) and Grashof number (Gr) on the flow and heat transfer pattern is examined. Further, the issue of reliability of the results is addressed. The results demonstrate that BDM over-predicts the momentum and heat transfer rates compared with BFDM, which is in conformity with the fact that the additional term present in the BFDM hinders c...
42 citations
TL;DR: In this article, the fluid flow and heat transfer characteristics of round jet arrays impinging orthogonally on a flat-plate with confined walls at different crossflow orientations were investigated.
Abstract: This study investigates the fluid flow and heat transfer characteristics of round jet arrays impinging orthogonally on a flat-plate with confined walls at different crossflow orientations A computational fluid dynamic technique based on a control volume method is used to compute the detailed Nusselt number distributions on the flat plate This is achieved by solving the steady-state three-dimensional incompressible Reynolds-averaged Navier-Stoke's equations The Reynolds stress turbulence quantities are determined by a realizable κ-e turbulence model with an enhancement near-wall treatment Numerical computations are performed for two types of arrangements in round jet arrays, both inline and staggered, and three different crossflow directions, parallel, hybrid, and counter The jet Reynolds numbers ranging from 2,440 to 14,640 and three different jet-to-plate spacing ratios (Zn/dj) of 1, 3, and 6 are investigated in this study Results show that the flow exit crossflow direction would significantly affe
42 citations
TL;DR: In this paper, the lattice Boltzmann method (LBM) was applied to solve the energy equation of a transient conduction-radiation heat transfer problem in a 1-D concentric cylindrical participating medium.
Abstract: The lattice Boltzmann method (LBM) is applied to solve the energy equation of a transient conduction-radiation heat transfer problem in a 1-D concentric cylindrical participating medium. The finite-volume method (FVM) is used to obtain the radiative information. To study the effectiveness of the LBM-FVM combination to conduction-radiation problems in cylindrical media, the energy equation of the problem is also solved using the finite-difference method (FDM) in which the FVM is used to compute radiative information. The effects of different parameters, such as the conduction-radiation parameter, the scattering albedo, the extinction coefficient, and the radius ratio on temperature distributions in the medium are studied. Results of the present work are benchmarked against those available in the literature. LBM-FVM results are also compared with those obtained by the FDM-FVM combination. In all cases, excellent agreement has been obtained.
40 citations
TL;DR: In this paper, a numerical transient analysis of natural convection in air between two vertical parallel plates, heated at uniform heat flux, is carried out, and the problem is two-dimensional and laminar and the full Navier-Stokes and energy equations are employed.
Abstract: A numerical transient analysis of natural convection in air between two vertical parallel plates, heated at uniform heat flux, is carried out. The problem is two-dimensional and laminar and the full Navier-Stokes and energy equations are employed. The control volume method is used to discretize the equations on a uniform grid. Results are given at different aspect ratio values and Rayleigh number values. The simulation allows detection of complex structures of the flow inside and outside the channel. Temperature profiles as a function of time show an overshoot and undershoot increase at the lowest aspect ratio and highest Rayleigh number. Inside the channel conductive and convective regimes as well as an inverse fluid motion are observed. Transient average Nusselt number presents oscillations before the steady-state.
TL;DR: In this article, a numerical study of an electronic cooling module using a periodic jet flow at an orifice with net zero mass flux, known as a synthetic jet, is presented.
Abstract: This article presents a numerical study of an electronic cooling module using a periodic jet flow at an orifice with net zero mass flux, known as a synthetic jet. The two-dimensional time-dependant numerical simulation models the unsteady synthetic jet behavior, the flow within the cavity and the diaphragm movement while accounting for fluid turbulence using the shear-stress-transport (SST) k-ω turbulence model. Computations are performed for a selected range of parameters and the boundary conditions to obtain the heat and fluid flow characteristics of the entire synthetic jet module. The numerical simulation aptly predicts the sequential formation of the synthetic jet and its intrinsic vortex shedding process while accurately illustrating the flow within the cavity. It is indicated that the thermal performance of the synthetic jet is highly dependant on the oscillating diaphragm amplitude and frequency. At the heated surface, this jet impingement mechanism produces a very intense localized periodic cooli...
TL;DR: In this article, the effects of Brownian and thermophoretic diffusions on nonequilibrium heat conduction in a nanofluid layer with periodic heat flux on one side and specified temperature on the other side are investigated numerically.
Abstract: Effects of Brownian and thermophoretic diffusions on nonequilibrium heat conduction in a nanofluid layer with periodic heat flux on one side and specified temperature on the other side are investigated numerically. The problem is described by eight dimensionless parameters: density ratio, heat capacity ratio, Lewis number, Soret coefficient, initial volume fraction of nanoparticles, initial temperature, Sparrow number, and period of the surface heat flux. Effects of Brownian and thermophoretic diffusions of nanoparticles on nonequilibrium heat conduction in nanofluid obtained by dispersing copper nanoparticles into ethylene glycol are investigated. The results show that the Brownian and thermophoretic diffusions only affect the nanoparticle temperature, but their effect on the heat transfer enhancement is negligible.
TL;DR: In this paper, the uncertainties in the estimation of the Fanning friction and Colburn factors in a compact offset plate fin heat exchanger, and the generation of flow friction and heat transfer correlations in the form of f and j for compact wavy plate-fin heat exchangers are addressed.
Abstract: The objective of this work is to address the uncertainties in the estimation of the Fanning friction (f) and Colburn (j) factors in a compact offset plate fin heat exchanger, and the generation of flow friction and heat transfer correlations in the form of f and j for compact wavy plate fin heat exchangers. A typical offset fin has been analyzed using FLUENT software (a general purpose computational fluid dynamics (CFD) simulation tool) for estimation of f and j data. These results are compared with the results of the available correlations in the literature and in-house experimental results. Uncertainties in estimation of f and j data are reviewed and the variations in the results are highlighted. In the case of wavy fin configuration, very limited correlations are available in the literature. Hence, with the objective of developing correlations, 18 different types of wavy fins geometries have been analyzed using a CFD tool to find out the f and j data in the laminar and turbulent regions. Multiple regre...
TL;DR: In this article, a numerical study on heat distribution and thermal mixing during steady laminar natural convective flow within fluid-saturated porous square cavities has been carried out based on Bejan's heatlines.
Abstract: A numerical study on heat distribution and thermal mixing during steady laminar natural convective flow within fluid-saturated porous square cavities has been carried out based on Bejan's heatlines. Three different cases have been considered: (1) uniformly heated bottom wall, (2) discrete heat sources on walls, and (3) uniformly heated left and bottom walls. Studies illustrate that enhanced thermal mixing occurs at higher Da. It is also found that distributed heating enhances heat distribution and thermal mixing compared to uniform heating case. Overall, heatline approach has been found to be a very useful numerical tool to analyze heating strategies in porous media.
TL;DR: In this paper, heat and mass transfer from a porous body subject to convective drying is investigated numerically based on Luikov's equations, where air flow is assumed incompressible, two-dimensional, laminar, confined in a channel, and parallel to the rectangular-shaped solid, and the computed temporal and spatial variations of moisture content, temperature, concentration, and flow parameters for two different flow rates are analyzed.
Abstract: Heat and mass transfer from a porous body subject to convective drying is investigated numerically based on Luikov's equations The air flow is assumed incompressible, two-dimensional, laminar, confined in a channel, and parallel to the rectangular-shaped solid The finite-volume method is used and the computed temporal and spatial variations of moisture content, temperature, concentration, and flow parameters for two different flow rates are analyzed Two flow configurations are studied: with and without a flow divider upstream of the cylinder in an attempt to eliminate the presence of separation zones and study their effect on drying It was found that such effects may greatly affect the drying process, along with frontal area stagnation and the thickness of the body
TL;DR: In this paper, a lattice Boltzmann multiphase model with a large density ratio was extended to describe phase change with mass and heat transferring through the interface, and the phase change was considered as a change of phase order parameter and is disposed as a source term of the Cahn-Hilliard equation.
Abstract: Combining with a lattice Boltzmann thermal model, a lattice Boltzmann multiphase model with a large density ratio can be extended to describe phase change with mass and heat transferring through the interface. Based on the Stefan boundary condition, the phase change is considered as a change of phase order parameter and is disposed as a source term of the Cahn-Hilliard equation. This hybrid model is applied to simulate the motion and growth of a rising vapor bubble through a uniformly superheated liquid. Meanwhile, the parametric effect on the bubble growth, deformation and rising in the different surface tension forces and kinetic viscosities are also presented.
TL;DR: In this paper, a fluid-flow model which automatically determines the flow regime was used to analyze a timewise-periodic pipe flow, and numerical simulation was employed to implement the model.
Abstract: A fluid-flow model which automatically determines the flow regime was used to analyze a timewise-periodic pipe flow. Numerical simulation was employed to implement the model. The range of the instantaneous Reynolds number gave rise to four distinct flow regimes: laminarizing, fully laminar, turbulentizing, and fully turbulent. The period of the imposed harmonic oscillations was varied over a very wide range, and the magnitude of the oscillations was of the same order as that of the steady flow on which the oscillations were superimposed. A large-period limit at which the flow is quasi-steady was identified. The predicted quasi-steady fully developed friction factor for each regime was found to be in excellent agreement with steady-state results applied instantaneously. A metric in the form of the ratio of the turbulence production to turbulence destruction was used to exhibit the turbulence characteristics of each of the four flow regimes. The value of this metric was somewhat different in the laminarizat...
TL;DR: In this paper, a numerical investigation of forced convective cooling of an array of obstacles was performed to synthesize the effects of various pertinent parameters on the cooling performance Reynolds number, channel clearance height-to-element length ratio, spacing to channel height ratio, geometric ratio of the blocks, and total number of obstacles were varied to estimate their influence on cooling process.
Abstract: A numerical investigation of forced convective cooling of an array of obstacles was performed to synthesize the effects of various pertinent parameters on the cooling performance Reynolds number, channel clearance height-to-element length ratio, spacing-to-channel height ratio, geometric ratio of the blocks, and total number of obstacles were varied to estimate their influence on the cooling process Two generalized sets of Nusselt number correlations were developed for the obstacles in the channel based on a very large number of computational simulations The numerical data match the correlation equations quite well
TL;DR: In this article, the results of an investigation into aspects of the simulation and modeling of turbulent jets that impinge orthogonally on a target surface are presented. The focus is on the case of a jet which issues from a circular pipe into a stagnant surrounding at the relatively high value of Reynolds number of 23,000 (based on nozzle diameter and bulk velocity) for which experimental data are available.
Abstract: This article documents the results of an investigation into aspects of the simulation and modeling of turbulent jets that impinge orthogonally on a target surface. The focus is on the case of a jet which issues from a circular pipe into stagnant surrounding at the relatively high value of Reynolds number of 23,000 (based on nozzle diameter and bulk velocity) for which experimental data are available. Large-eddy simulations were performed to obtain details of the mean flows and the turbulence fields including distributions of all components of the turbulent heat fluxes. The outcome of these simulations were used to assess three alternative models for the turbulent heat fluxes which differ from the conventional Fourier's Law by not being based on the assumption of proportionality between the eddy and thermal diffusivities via a constant Prandtl number. It was found that only one of the models considered succeeds in representing the effects on the heat fluxes of the complex strain field associated with the s...
TL;DR: In this article, the effects of global Lewis number on the behavior of Reynolds heat and mass fluxes in turbulent premixed flames are studied based on three-dimensional direct numerical simulation (DNS) of a number of statistically planar turbulent pre-painted flames with a global Lewis numbers ranging from Le = 0.34 to 1.2.
Abstract: The effects of global Lewis number on the behavior of Reynolds heat and mass fluxes in turbulent premixed flames are studied based on three-dimensional direct numerical simulation (DNS) of a number of statistically planar turbulent premixed flames with a global Lewis number ranging from Le = 0.34 to 1.2. For the same values of initial turbulent flow field parameters and duration of flame-turbulence interaction, it has been found that both Reynolds heat and mass fluxes may exhibit countergradient transport for flames with a Lewis number significantly smaller than unity; whereas predominantly gradient-type transport is obtained for flames with a Lewis number closer to unity. It is demonstrated that strong flame normal acceleration due to greater heat release in the low Lewis number flames acts to promote countergradient transport, and that the magnitude of the flame normal acceleration decreases with increasing Lewis number. Algebraic models for Reynolds heat and mass fluxes are proposed in which the effect...
TL;DR: In this article, the authors presented the application of the multiplerelaxation-time (MRT) lattice Boltzmann equation (LBE) method with nine-velocity model to the numerical prediction of a laminar and convective-heated transfer through a two-dimensional obstructed channel flow.
Abstract: This article presents the application of the multiple-relaxation-time (MRT) lattice Boltzmann equation (LBE) method with nine-velocity model to the numerical prediction of a laminar and convective-heated transfer through a two-dimensional obstructed channel flow. The obstruction is carried out by three obstacles including two located on the upper wall and the other on the lower wall of the channel. The calculations are validated against results available in literature. Various physical arrangements are regarded as the size of the obstacles and the distance between the two upper obstacles to investigate their effects on thermal and flow characteristics. Results, presented for a Prandtl number equal to 0.71 and a Reynolds number ranging from 100 to 1200, showed that the heat transfer and the air flow depend both on the Reynolds number and geometric data of the configuration.
TL;DR: In this paper, a numerical study of the swirl effect on a coaxial jet combustor flame including radiative heat transfer is presented, and the results clearly show that radiation must be taken into account to obtain good accuracy for turbulent diffusion flame in combustor chamber.
Abstract: A numerical study of the swirl effect on a coaxial jet combustor flame including radiative heat transfer is presented. In this work, the standard k-e model is applied to investigate the turbulence effect, and the eddy dissipation model (EDM) is used to model combustion. The radiative heat transfer and the properties of gases and soot are considered using a coupled of the finite-volume method (FVM), and the narrow-band based weighted-sum-of-gray gases (WSGG-SNB) model. The results of this work are validated by experiment data. The results clearly show that radiation must be taken into account to obtain good accuracy for turbulent diffusion flame in combustor chamber. Flame is very influenced by the radiation of gases, soot, and combustor wall. However, swirl is an important controlling variable on the combustion characteristics and pollutant formation.
TL;DR: In this article, the heat transfer behavior of phase change material fluid (PCM) under laminar flow conditions in circular tubes and internally longitudinal finned tubes was studied, and an effective specific heat technique was used to model the phase change process.
Abstract: The heat transfer behavior of phase change material fluid (PCM) under laminar flow conditions in circular tubes and internally longitudinal finned tubes was studied. An effective specific heat technique was used to model the phase change process. Heat transfer results for a smooth circular tube with PCM fluid were obtained under hydrodynamically and thermally fully developed conditions. Results for the finned tube were obtained using the H2 and T boundary conditions. It was determined that the Nusselt number was strongly dependent on the Stefan number, fin thermal conductivity value, and height of the fins.
TL;DR: In this article, the interaction between gas radiation and double diffusive convection in cooperating cases was investigated in a differentially-heated cavity filled with nongray air-CO2 or air-H2O mixtures.
Abstract: This study highlights the interaction between gas radiation and double diffusive convection in cooperating cases. We consider a square differentially-heated cavity filled with nongray air-CO2 or air-H2O mixtures. The governing equations are solved by a finite-difference method. The radiative sources are evaluated by the discrete ordinates method associated to the SLW spectral model. Results obtained for two average concentrations of CO2 and H2O (10% and 25%) show that radiation influences the temperature and concentration fields by creating oblique stratifications. The Nusselt numbers are decreased, whereas the Sherwood numbers are only slightly reduced. These effects are accentuated in air-H2O mixtures.
TL;DR: In this article, the problem of fully developed natural convection heat and mass transfer of a micropolar fluid between porous vertical plates with asymmetric wall temperatures and concentrations is solved analytically by the homotopy analysis method (HAM).
Abstract: In this article, we consider the problem of fully developed natural convection heat and mass transfer of a micropolar fluid between porous vertical plates with asymmetric wall temperatures and concentrations. The resulting boundary-value problem is solved analytically by the homotopy analysis method (HAM). Profiles for velocity and microrotation are presented for a range of values of the Reynolds number and the micropolar parameter.
TL;DR: In this article, an improved two-node model of human body is employed to simulate the thermoregulatory behaviors and the thermal responses between the textiles and body skin for accuracy simulation of realistic wearing situations.
Abstract: This article reports on the numerical simulation of the transient heat transfer coupled with multidimensional liquid diffusion in porous textiles with a measurable-parameterized model. This model is developed with the incorporation of measured multidimensional liquid diffusion properties into the parameterization of the liquid transfer model by the investigation of physical mechanisms. An improved two-node model of human body is employed to simulate the thermoregulatory behaviors and the thermal responses between the textiles and body skin are considered through the boundary conditions for accuracy simulation of realistic wearing situations. The predicted results of this model are compared with the experimental data for validating the model accuracy. The influence of the multidimensional liquid diffusion property of porous textiles on the moisture performance of clothing during the wearing period is investigated through a series of computational experiments. This model offers the ability to predict the mu...
TL;DR: In this article, the authors examined the performance of linear and nonlinear eddy-viscosity models when used to predict the turbulent flow in periodically sinusoidal-wave channels.
Abstract: This work examines the performance of linear and nonlinear eddy-viscosity models when used to predict the turbulent flow in periodically sinusoidal-wave channels. Two geometries are investigated, namely a converging-diverging channel and a channel with concave-convex walls. The numerical method employed for the discretization of the equations is the control-volume method in a boundary-fitted nonorthogonal coordinate system. The SIMPLE algorithm is used for correcting the pressure field. The classical wall function and a low Reynolds model are used to describe the flow near the wall. Comparisons between those two approaches using linear and nonlinear turbulence models are done. Here, a new implicit numerical treatment is proposed for the nonlinear diffusion terms of the momentum equations in order to increase the robustness. Results show that by decomposing and treating terms as presented, solutions using nonlinear models and the high Reynolds wall treatment, which combine accuracy and economy, are more st...
TL;DR: In this paper, the authors demonstrate the numerical simulation of the compound heat sink and provide physical insight into the flow and heat transfer characteristics using a power-law scheme on an orthogonal nonuniform staggered grid.
Abstract: The present study demonstrates the numerical simulation of the compound heat sink and provides physical insight into the flow and heat transfer characteristics. The governing equations are discretized by using a control-volume-based finite-difference method with a power-law scheme on an orthogonal nonuniform staggered grid. The coupling of the velocity and the pressure terms of momentum equations are solved by the SIMPLEC algorithm. The well-known RNG k − e two-equations turbulence model is employed to describe the turbulent structure and behavior. The compound heat sink is composed of a plate fin heat sink and some pins between plate fins. The objective of this investigation is to examine the effects of the types and the arrangements of the pins. It is found that the compound heat sink has better synthetical performance than the plate fin heat sink. Moreover, the compound heat sink which is composed of a plate fin heat sink and circular pins performs better than the square ones.
TL;DR: In this paper, a three-dimensional transient numerical analysis was performed inside the automobile cabin during heating period, and a 3D vehicle cabin including glazing surfaces was modelled and analyzed.
Abstract: In this study, a three-dimensional transient numerical analysis was performed inside the automobile cabin during heating period. A three-dimensional vehicle cabin including glazing surfaces was mod...