Showing papers in "International Journal of Heat and Mass Transfer in 2006"

TL;DR: In this paper, the authors studied the heat transfer behavior of aqueous suspensions of multi-walled carbon nanotubes (CNT nanofluids) flowing through a horizontal tube.

TL;DR: In this paper, a unifying equation for five fundamental effective thermal conductivity structural models (Series, Parallel, two forms of Maxwell-Eucken, Effective Medium Theory) is derived.

TL;DR: In this article, the authors describe an experimental study of thermal contact conductance enhancement enabled by carbon nanotube (CNT) arrays synthesized directly on silicon wafers using plasma-enhanced chemical vapor deposition.

TL;DR: In this paper, three-dimensional numerical simulations were performed for laminar thermally developing flow in microchannels of different aspect ratios, based on the temperature and heat flux distributions obtained, both the local and average Nusselt numbers were presented graphically as a function of the dimensionless axial distance and channel aspect ratio.

TL;DR: In this article, the enhancement of the thermal conductivity of water in the presence of copper (Cu) using the chemical reduction method is presented, which is the first time that chemical reduction for synthesis of nanofluids containing Cu nanoparticles in water is reported.

TL;DR: In this article, the interpolation supplemented lattice Boltzmann method has been used to simulate high Rayleigh number natural convection in a square cavity and the results were shown to be in very good agreement with the benchmark results available in the literature.

TL;DR: In this paper, a semiclassical two-step heating model is proposed to investigate thermal transport in metals caused by ultrashort laser heating, based on the Boltzmann transport equation, three equations of the conservation of number density, momentum and energy are derived for the electron subsystem.

TL;DR: In this paper, an analytical study of the forced convection heat transfer characteristics in high porosity open-cell metal-foam filled pipes is presented. And the results show that the pore size and porosity of metal foams play important roles on overall heat transfer performance.

TL;DR: In this paper, a numerical study to investigate the steady laminar natural convection flow in a square cavity with uniformly and non-uniformly heated bottom wall, and adiabatic top wall maintaining constant temperature of cold vertical walls has been performed.

TL;DR: In this paper, a comprehensive investigation of the radiation energy transfer between two semi-infinite parallel plates at different temperatures, involving silicon with varying dopant concentrations, when the distance of separation is from 10μm down to 1nm, is presented.

TL;DR: In this paper, the Darcy-Forchheimer model is used to simulate the momentum transfer in the porous medium and numerical results are presented in terms of stream functions, temperature profiles and Nusselt numbers.

TL;DR: In this article, the capabilities of three volume-of-fluid methods for the calculation of surface tension-dominant two-phase flows are tested, and the analytical solutions for each problem serve to examine the accuracy and the convergence behavior of each approach.

TL;DR: A genetic algorithm is used to find the geometry most favorable to simultaneously maximize heat exchange while obtaining a minimum pressure loss, and a nearly optimal speed-up is obtained for the present configuration.

TL;DR: In this paper, the melting of a moderate-Prandtl-number material (n-eicosane) in a cylindrical enclosure heated from the side is described.

TL;DR: In this article, the authors investigated the role of the nanoparticle surface coating on CHF enhancement of nano-fluids and found that the nanoparticles significantly enhanced CHF compared to pure water.

TL;DR: In this article, the authors present major findings in the literature on fundamentals of flow physics in microchannels and provide an extensive overview on the available knowledge base as well as the areas that require intensive investigation.

TL;DR: In this paper, the effects of enhanced surfaces and spray inclination angle (the angle between the surface normal and the axis of symmetry of the spray) on heat transfer during spray cooling were studied.

TL;DR: In this article, the effectiveness of thermal conductivity enhancers (TCEs) in improving the overall thermal conductance of phase change materials (PCMs) used in cooling of electronics is investigated numerically.

TL;DR: In this article, the relationship between the emissivity of aluminum alloy surfaces and surface roughness is explored, and two methods are discussed which yield good overall predictions of rough surfaces.

TL;DR: In this paper, two approaches for determining the optimal geometric parameters of the microchannels in micro heat exchangers are described. And the second approach involves the usage of multi-objective genetic algorithms in combination with CFD.

TL;DR: In this article, a robust four-layer model is presented to describe the LDL transport in the arterial wall coupled with the transport in lumen, where the endothelium, intima, internal elastic lamina and media are all treated as macroscopically homogeneous porous media and the volume-averaged porous media equations are employed to model various layers, with Staverman filtration and osmotic reflection coefficients introduced to account for selective permeability of each porous layer to certain solutes.

TL;DR: In this article, an integral method of boundary layer analysis is employed to derive closed form expressions for the calculation of average heat transfer from the tubes of a bank, that can be used for a wide range of parameters including longitudinal pitch, transverse pitch, Reynolds and Prandtl numbers.

TL;DR: In this article, a tilted heated square cylinder kept in an enclosure has been studied in the range of 10 3 ǫ⩽ Ra ⩽ 10 6, where the stream function-vorticity formulation of the Navier-Stokes equation is solved numerically using finite-difference method in non-orthogonal body-fitted coordinate system.

TL;DR: In this article, an interdigitated cathode flow field has been tested in situ with neutron radiography to measure the water transport through the porous gas diffusion layer in a PEM fuel cell, and the resulting liquid water accumulation and dissipation rates with in-plane water distributions are correlated to measured pressure differential between inlet and outlet gas streams.

TL;DR: In this article, the authors investigated flow boiling flow patterns in four circular tubes with internal diameters of 1.10, 2.88 and 4.26mm in vertical upward two-phase flow using R134a as the working fluid.

TL;DR: In this paper, a mathematical model is developed for the coupled analysis of the transport of macromolecules, such as low-density lipoproteins (LDL), in the blood stream and in the arterial walls.

TL;DR: In this paper, the cooling characteristics of PF-5052 spray nozzles impacting a square heated test surface in an upward orientation were investigated, and the results showed no measurable influence on any spray cooling regimes examined.

TL;DR: In this paper, the authors compare two different mathematical hyperbolic models in dual-phase-lag heat conduction, and they ask for the parameter regions where stability can be expected, while they conclude that one model should be considered only in a restricted parameter region.

TL;DR: In this article, a new correlation to predict the two-phase flow pressure drop in microtubes was developed in the form of the Lockhart-Martinelli correlation, which includes the tube diameter, surface tension effect, and the effect of the Reynolds number.

TL;DR: In this article, the application of neutron radiography to measurements of water content within the flow field channels of an operating 50 cm2 PEM fuel cell is described. And the effects of both the current density and cathode stoichiometric ratio on the quantity of accumulated water are discussed.