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Showing papers in "International Journal of Heat and Mass Transfer in 2003"


Journal ArticleDOI
TL;DR: In this article, a model is developed to analyze heat transfer performance of nanofluids inside an enclosure taking into account the solid particle dispersion, where the transport equations are solved numerically using the finite-volume approach along with the alternating direct implicit procedure.

2,560 citations


Journal ArticleDOI
TL;DR: In this paper, the authors investigated the role of transient conduction in pool boiling and concluded that the change of surface characteristics during boiling due to trapped particles on the surface is the cause for the shift of the boiling characteristics in the negative direction.

954 citations


Journal ArticleDOI
TL;DR: In this paper, the formation and distribution of condensed water in diffusion medium of proton exchange membrane fuel cells, and its tendency to reduce the local effective mass diffusivity and to influence cell performance, are studied.

922 citations


Journal ArticleDOI
TL;DR: In this article, the kinematic constitutive equation for the drift velocity has been studied for various two-phase flow regimes, and a comparison of the model with various experimental data over various flow regimes and a wide range of flow parameters shows a satisfactory agreement.

799 citations


Journal ArticleDOI
TL;DR: Based on the effective medium approximation and the fractal theory for the description of nanoparticle cluster and its radial distribution, a method for modeling the effective thermal conductivity of "nanofluid" is established as discussed by the authors.

762 citations


Journal ArticleDOI
TL;DR: The main concepts studied in this review are transport in porous media using mass diffusion and different convective flow models such as Darcy and the Brinkman models as mentioned in this paper, and energy transport in tissues is also analyzed.

637 citations


Journal ArticleDOI
TL;DR: In this paper, the authors measured and predicted saturated flow boiling heat transfer in a water-cooled micro-channel heat sink and found that the dominant heat transfer mechanism is forced convective boiling corresponding to annular flow.

556 citations


Journal ArticleDOI
TL;DR: In this paper, a flow pattern/flow structure based heat transfer model for condensation inside horizontal, plain tubes is proposed based on simplified flow structures of the flow regimes, and also includes the effect of liquid-vapor interfacial roughness on heat transfer.

474 citations


Journal ArticleDOI
TL;DR: In this article, the authors explored hydrodynamic instability and pressure drop in a water-cooled two-phase micro-channel heat sink containing 21 parallel 231 × 713 μm micro-channels.

472 citations


Journal ArticleDOI
TL;DR: In this paper, a new flow pattern map and flow pattern based heat transfer model for condensation inside horizontal plain tubes are proposed, which incorporates a newly defined logarithmic mean void fraction (LM e ) method for calculation of vapor void fractions spanning from low pressures up to pressures near the critical point.

448 citations


Journal ArticleDOI
TL;DR: In this paper, an experimental investigation has been performed on the laminar convective heat transfer and pressure drop of water in 13 different trapezoidal silicon microchannels, and dimensionless correlations for the Nusselt number and the apparent friction constant are obtained for the flow of water.

Journal ArticleDOI
TL;DR: In this paper, a new quasi-three-dimensional model for vertical ground heat exchanger (GHE) is established, taking the fluid axial convective heat transfer and thermal short-circuiting among U-tube legs into account.

Journal ArticleDOI
TL;DR: In this paper, the size effect induced by the variation of dominant factors and phenomena in the flow and heat transfer as the device scale decreases is discussed, and the relative importance of viscous force modifies the correlation between Nu and Ra for natural convection in a microenclosure.

Journal ArticleDOI
TL;DR: In this article, a closed loop spray cooling test setup is established for the cooling of high heat flux heat sources, where eight miniature nozzles in a multi-nozzle plate are used to generate a spray array targeting at a 1 × 2 cm2 cooling surface.

Journal ArticleDOI
TL;DR: In this paper, the Navier-Stokes equations are still valid for the laminar flow of deionized water in smooth silicon microchannels having hydraulic diameter as small as 25.9 μm.

Journal ArticleDOI
TL;DR: In this article, the momentum balance at the interface between a liquid and a porous substrate is investigated for a configuration with forced flow parallel to the interface, where an heterogeneous continuously varying transition layer between the two outer bulk regions is introduced.

Journal ArticleDOI
TL;DR: In this article, an experimental study of low-level turbulence natural convection in an air filled vertical square cavity was conducted, where both mean and fluctuation quantities are presented, i.e., local velocity and temperature were simultaneously measured at different locations in the cavity and both mean or fluctuation quantity are presented.

Journal ArticleDOI
TL;DR: In this article, the authors proposed a two-fluid model to predict the active nucleation site density, which is a function of the critical cavity size and the contact angle.

Journal ArticleDOI
TL;DR: This paper proposes a simple method that allows the implementation of the full spectrum of TVD schemes in unstructured grids, while recovering their exact formulation on structured grids.

Journal ArticleDOI
TL;DR: In this article, a simultaneous visualization and measurement investigation has been carried out on flow boiling of water in parallel silicon microchannels of trapezoidal cross-section, and large-amplitude/long-period fluctuations with time in wall temperatures, fluid temperatures and fluid pressures, were measured for the first time during flow boiling in the micro-channels.

Journal ArticleDOI
TL;DR: In this paper, a generalized polynomial chaos algorithm for the solution of transient heat conduction subject to uncertain inputs is presented, where the stochastic input and solution are represented spectrally by the orthogonal polynomials from the Askey scheme.

Journal ArticleDOI
TL;DR: In this paper, an annular flow model is developed to predict the saturated flow boiling heat transfer coefficient in water-cooled micro-channel heat sinks and good agreement is achieved between the model predictions and heat transfer coefficients data over broad ranges of flow rate and heat flux.

Journal ArticleDOI
TL;DR: In this article, the effects of the height and thickness of square micro-pin-fin on boiling heat transfer from silicon chips immersed in a pool of degassed or gas-dissolved FC-72 were investigated.

Journal ArticleDOI
TL;DR: In this paper, the entropy generation due to heat transfer and friction has been determined in transient state for laminar natural convection by solving numerically the mass, momentum and energy balance equations, using a control volume finite-element method.

Journal ArticleDOI
TL;DR: In this article, the influence of viscous dissipation and radiation on the problem of unsteady magnetohydrodynamic free-convection flow past an infinite vertical heated plate in an optically thin environment with time-dependent suction was investigated.

Journal ArticleDOI
TL;DR: In this paper, an experimental set-up has been elaborated to investigate heat and mass transfer and to analyze two-phase flow instabilities in rectangular microchannels with a hydraulic diameter of 889 μm.

Journal ArticleDOI
TL;DR: Theoretical analysis of the nucleation process for frost formation on a cold surface shows that the air at the cold surface should be supersaturated in order for frost nucleation to occur.

Journal ArticleDOI
TL;DR: In this paper, the authors developed a simple experimental and numerical method to study the temperature transition of freezing droplets, which was used to predict the freezing time of the droplet.

Journal ArticleDOI
Junil Ryu1, Do Hyung Choi1, Sung Jin Kim1
TL;DR: In this paper, a three-dimensional analysis procedure for the thermal performance of a manifold microchannel heat sink has been developed and applied to optimize the heat-sink design, and the optimal dimensions and corresponding thermal resistance have a power-law dependence on the pumping power.

Journal ArticleDOI
TL;DR: In this paper, a water-ethanol binary drop of few millimetres size is shown to have a monotonous evolution in the evaporation rate and drop profile with time.