Showing papers in "International Journal of Heat and Mass Transfer in 2010"

TL;DR: In this article, a similarity solution is presented which depends on the Prandtl number Pr, Lewis number Le, Brownian motion number Nb and thermophoresis number Nt.

TL;DR: In this paper, the heat transfer coefficient and friction factor of the TiO 2 -water nanofluids flowing in a horizontal double tube counter-flow heat exchanger under turbulent flow conditions, experimentally.

TL;DR: In this paper, Wang et al. used the Poincare section to analyze the fluid mixing in three-dimensional wavy microchannels with rectangular cross-sections and found that the quantity and the location of the vortices may change along the flow direction, leading to chaotic advection.

TL;DR: In this paper, the authors present new correlations for the convective heat transfer and the friction factor developed from the experiments of nanoparticles comprised of aluminum oxide, copper oxide and silicon dioxide dispersed in 60% ethylene glycol and 40% water by mass.

TL;DR: In this paper, the effects of Peclet number, volume concentration of suspended nanoparticles, and particle type on the heat characteristics of two different optimum nanoparticle concentrations exist in a shell and tube heat exchanger under turbulent flow condition.

TL;DR: In this article, the melting of a phase-change material (PCM) in a vertical cylindrical tube is investigated by means of a numerical simulation which is compared to the previous experimental results.

TL;DR: In this paper, the authors considered the problem of thermal convection in a horizontal layer of incompressible Newtonian fluid with gravity acting downward and found that the thermal relaxation effect is significant if the Cattaneo number is sufficiently large, and the convection mechanism switches from stationary convection to oscillatory convection with narrower cells.

TL;DR: In this article, a peridynamic model for transient heat and mass transfer in fracture-prone bodies is proposed, which is valid when the body undergoes damage or evolving cracks.

TL;DR: In this article, the pool boiling behavior of low concentration nanofluids (⩽ 1 g/l) was experimentally studied over a flat heater at 1 m, and the authors investigated possible causes responsible for the deposition of nanoparticle on the heater surface.

TL;DR: In this article, three different schemes of adding force term to LBM with BGK method were evaluated and compared with results predicted by using finite volume method (FVM) for Ra = 10 6 and Pr = 0.71.

TL;DR: In this paper, a new 1D and 2D solid cylindrical source model for ground-coupled heat pump (GCHP) systems is presented to consider both the radial dimension and the heat capacity of the borehole or pile.

TL;DR: In this paper, high-speed video and infrared thermometry were used to obtain time and space-resolved information on bubble nucleation and heat transfer in pool boiling of water.

TL;DR: In this article, phase change materials (PCMs) are used to simulate the heat source of a battery cell and two different PCM designs are investigated: one with a PCM cylinder surrounding the heater, and the other with PCM jackets wrapping the heater.

TL;DR: In this article, thin-film coatings applied to boiling surfaces using a layer-by-layer assembly method demonstrated significant enhancement in the pool boiling critical heat flux (CHF) and nucleate boiling heat transfer coefficient.

TL;DR: In this article, the authors measured the dependence of thermal resistance on the thickness and particle size of sintered copper powder wick surfaces, both under evaporation and boiling conditions, and demonstrated that for a given wick thickness, an optimum particle size exists which maximizes the boiling heat transfer coefficient.

TL;DR: In this paper, the thermophysical properties of Al2O3 nanofluid have been determined through experiments at different volume concentrations and temperatures and validated through experiments in the Reynolds number range of 10,000-22,000 with tapes of different twist ratios.

TL;DR: In this article, experimental results of saturated-flow boiling heat transfer in micro/mini-channels for both multi-and single-channel configurations were obtained from the literature and the collected database contains more than 3700 data points, covering a wide range of working fluids, operational conditions and different micro-channel dimensions.

TL;DR: In this paper, a two-dimensional analysis is used to study the thermal performance of a cylindrical heat pipe utilizing nanofluids, and the existence of an optimum mass concentration for nanoparticles in maximizing the heat transfer limit is established.

TL;DR: In this paper, the authors defined the equivalent thermal resistance of a heat exchanger, which measures the irreversibility of heat transfer for the purpose of object heating or cooling, rather than from the heat to work conversion.

TL;DR: A coupled volume-of-fluid and level set (VOSET) method, which combines the advantages and overcomes the disadvantages of VOF and LS methods, is presented for computing incompressible two-phase flows.

TL;DR: In this article, a thermal network model is developed and used to analyze heat transfer in a high temperature latent heat thermal energy storage unit for solar thermal electricity generation, where the benefits of inserting multiple heat pipes between a heat transfer fluid and a phase change material (PCM) are of interest.

TL;DR: In this paper, the authors provided a theoretical investigation of the entropy generation analysis due to flow and heat transfer in nanofluids, and two different models were used to represent theoretical and experimental values.

TL;DR: In this paper, the impingement heat transfer characteristics of a synthetic jet are studied and the behavior of the average heat transfer coefficient of the impinged heated surface with variation in the axial distance between the jet and the heated surface is measured.

TL;DR: In this article, the authors explored alternative correlations of two-phase friction pressure drop and void fraction for mini-channels based on the separated flow model and drift-flux model.

TL;DR: In this paper, a 3D numerical simulation methodology for the flow and heat transfer at the pore scale level of high porosity open cell metal foam is presented, which is discretised using a tetrahedral volume mesh for both void and solid phases.

TL;DR: In this paper, the influence of nanoparticles on the flow-boiling of R-134a/polyolester mixtures was quantified for flows of low vapor quality. But the influence was not quantified in the case of low-vapour quality.

TL;DR: In this article, an enhanced pool-boiling critical heat flux (CHF) at reduced wall superheat on nanostructured substrates using a low temperature process, microreactor-assisted-nanomaterial-deposition was reported.

TL;DR: In this paper, the authors present an experimental study of turbulent heat transfer and flow friction characteristics in a circular tube equipped with two types of twisted tapes: (1) typical twisted tapes and (2) alternate clockwise and counterclockwise twisted tapes (C-CC twisted tapes).

TL;DR: In this paper, the authors evaluated the forced convective heat transfer at the surfaces of a cube immersed in a turbulent boundary layer, for applications in atmospheric boundary layer (ABL) wind flow around surface-mounted obstacles such as buildings.

TL;DR: In this paper, a new criterion for physical confinement in microchannel flow boiling, termed the convective confinement number, was proposed, which incorporates the effects of mass flux, as well as channel cross-sectional area and fluid properties.