Showing papers in "International Journal of Heat and Mass Transfer in 2013"

TL;DR: In this article, the authors investigated the effects of nanofluids on the performance of solar collectors and solar water heaters from the efficiency, economic and environmental considerations viewpoints, and made some suggestions to use the nanoparticles in different solar thermal systems such as photovoltaic/thermal systems, solar ponds, solar thermoelectric cells, and so on.

TL;DR: In this article, the analysis of the second law of thermodynamics applied to an electrically conducting incompressible nanofluid fluid flowing over a porous rotating disk in the presence of an externally applied uniform vertical magnetic field is considered.

TL;DR: In this article, the authors characterized pool boiling on surfaces with wettabilities varied from superhydrophobic to super-hydrophilic, and provided nucleation measurements, and developed an analytical model that describes how biphilic surfaces effectively manage the vapor and liquid transport, delaying critical heat flux and maximizing the heat transfer coefficient.

TL;DR: In this article, a review of the literature on entropy generation due to flow and heat transfer of nanofluids in different geometries and flow regimes is presented, and some suggestions for future work are presented.

TL;DR: In this article, the combined effects of buoyancy force, convective heating, Brownian motion, thermophoresis and magnetic field on stagnation point flow and heat transfer due to nanofluid flow towards a stretching sheet were analyzed.

TL;DR: In this article, a linear interpolation between the Nusselt numbers at Re −2300 and Re −4000 is presented, based on the results of a paper published recently.

TL;DR: In this paper, a consolidated database for flow boiling in mini/micro-channels is amassed from 31 sources, of which 10,805 data points are designated as pre-dryout.

TL;DR: In this article, the authors revisited their previous model and extended it to the case when the nanofluid particle fraction on the boundary is passively rather than actively controlled, which makes the model physically more realistic than their previous models.

TL;DR: In this article, the effect of magnetic field on stagnation point flow and heat transfer due to nanofluid towards a stretching sheet was analyzed using Runge-Kutta fourth order method with shooting technique.

TL;DR: In this article, the solidification of a phase change material (PCM) in a triplex tube heat exchanger with and without internal and external fins was investigated using a 2D numerical model developed with the Fluent 6.3.26 software.

TL;DR: In this paper, a second-order slip flow model is used to predict the flow characteristics accurately, and the effects of the two mass suction and mixed convection parameters on the reduced skin friction coefficient, heat transfer from the surface of the sheet, dimensionless velocity and temperature distributions are presented graphically and discussed.

TL;DR: In this article, the effects of homogeneous-heterogeneous reactions in nanofluid flow over a stretching or shrinking sheet placed in a porous medium saturated with a nanoflide are investigated.

TL;DR: In this article, four different sized silicon-dioxide nanoparticles (5, 10, 30, and 60 nm in diameter) were dispersed in a molten salt eutectic to obtain high temperature operating fluids (nanomaterials).

TL;DR: In this article, a phase-change lattice Boltzmann method (LBM) was used for simulation of liquid-vapor phase change heat transfer, which is determined by thermodynamic relation given by the equation of state.

TL;DR: In this article, the relationship between the structure of paraffin in solid and liquid states and its thermal conductivity was investigated using molecular dynamics simulations, and the results indicated that introducing carbon nanotubes and graphene into long-chain paraffins leads to a considerable enhancement in thermal conductivities.

TL;DR: In this paper, the heat and mass transfer characteristics of some nanofluid flows past a vertical infinite flat plate were considered and the radiation effect for two distinct types of thermal boundary conditions was also taken into account.

TL;DR: In this paper, the lattice Boltzmann method was used to solve the phase change problem in solid-liquid phase change problems and the phase interface was traced by updating the total enthalpy, and the moving interface was treated by the immersed moving boundary scheme for simulation of particulate suspensions.

TL;DR: In this paper, the authors investigated the heat transfer enhancement of micro-channel heat sinks with periodic expansion-constriction cross-sections both experimentally and numerically, and found that the numerical predictions of apparent friction factor and Nusselt number are in good agreement with experimental data.

TL;DR: Entransy theory is compared with entropy theory in several aspects, including the heat transfer purpose, irreversibility and optimization principle for energy savings or weight reductions of thermal facilities.

TL;DR: In this article, a two-dimensional grating/thin-film nanostructure is proposed as an efficient emitter, whose performance is enhanced by the excitations of both surface plasmon polaritons (SPPs) and magnetic polariton (MPs).

TL;DR: In this paper, a new universal approach to predicting the condensation heat transfer coefficient for mini/micro-channel flows is proposed that is capable of tackling many fluids with drastically different thermophysical properties and very broad ranges of all geometrical and flow parameters of practical interest.

TL;DR: In this paper, the thermal performance of porous media receiver was investigated by combining the Monte Carlo Ray Tracing (MCRT) method and FLUENT software with user defined functions (UDFs).

TL;DR: In this article, a fractal-intersecting sphere model was proposed for the nano-porous silica aerogel in which the scale effect on gas conduction and solid-matrix conduction were both considered.

TL;DR: This work proposes to present the complete cycle development of an optimized heat sink designed by using Topology Optimization Method (TOM) for best performance, including minimization of pressure drop in fluid flow and maximization of heat dissipation effects, aiming small scale applications.

TL;DR: In this paper, the effect of nanoparticle loading on the thermal conductivity of PCM/nanoparticle composite was investigated in a square enclosure with a constant heat flux on one side, while the other sides are thermally insulated.

TL;DR: In this article, the most important parameters both geometrical (porosity, pore density, and foam core height) and operative (air mass flow rate, imposed heat flux) affecting the heat transfer and fluid flow behavior of these enhanced surfaces are analyzed and discussed.

TL;DR: In this article, numerical simulations of single elongated bubbles in flow boiling conditions within circular microchannels were performed, where thin-film evaporation was proved to be the dominant heat transfer mechanism in the liquid film region between the wall and the elongated bubble.

TL;DR: In this paper, the authors investigated the flow and heat transfer of Jeffrey fluid near the stagnation point on a stretching/shrinking sheet with a parallel external flow and found that the structure of the solutions strongly depends on a parameter measuring the ratio of strength of the external flow to surface stretching and shrinking.

TL;DR: In this article, the authors investigated the thermophysical properties, pressure drop and heat transfer performance of Al2O3 nanoparticles suspended in R-134a, and they used a model from existing studies to determine the thermal conductivity and viscosity of the nanorefrigerants for the nanoparticle concentrations of 1 to 5 vol%.

TL;DR: In this article, the effect of nano-enhanced phase change materials (NePCM) inside an annular cavity formed between two circular cylinders is investigated experimentally and numerically, where the inner cylindrical tube is subjected to a constant heat flux, while the outer shell is thermally insulated.