Showing papers in "International Journal of Heat and Mass Transfer in 2001"

TL;DR: In this article, a geometrical effective thermal conductivity model of a saturated porous metal foam was developed, based on the idealized three-dimensional basic cell geometry of a foam, the tetrakaidecahedron.

TL;DR: In this article, a supported phase change material (PCM) made of paraffin impregnated by capillary forces in a compressed expansed natural graphite (CENG) matrix is presented.

TL;DR: In this paper, the evaporation and condensation coefficients of water are extensively analyzed considering also data hitherto not taken into account, and a decline of both coefficients with increasing temperature and pressure is derived.

TL;DR: In this article, the Zuber hydrodynamic theory is modified to account for the effect of the coating modulation-wavelength on the development of the stable vapor layer above the coated surface, which effectively chokes the liquid down-flow towards the surface (above the coating).

TL;DR: In this paper, a systematic analysis of the variances among diAerent boundary conditions establishes the convergence or divergence among competing models, and a set of correlations are given for interchanging the interface velocity and temperature as well as the average Nusselt number among various models.

TL;DR: In this article, a numerical model was developed to predict the mass flow between channels in a polymer electrolyte membrane (PEM) fuel cell with a serpentine flow path, and the results indicated that flow distribution in both anode and cathode channels are significantly affected by the mass consumption patterns on the Membrane Electrode Assembly (MEA).

TL;DR: In this article, a mathematical model for turbulent flow in porous media following the second path, or say, space-integrating the equations for turbulent flows in clear fluid is presented.

TL;DR: In this article, a numerical experiment was conducted to determine the interfacial convective heat transfer coefficient in the two-energy equation model for convection in porous media, which is needed when the local thermal equilibrium between the fluid and solid phases breaks down.

TL;DR: In this paper, an inverse heat conduction problem in a system is solved using a non-integer identified model as the direct model for the estimation procedure, which is efficient when some governing parameters of the heat transfer equations, such as thermal conductivity or thermal resistance are not known precisely.

TL;DR: In this article, the influence of the dimensions of the micro-channels on the heat transfer performance was analyzed numerically, based on these computations, deep micro-channel were used for the experimental studies reported here.

TL;DR: In this article, the authors consider the problem of accuracy in heat rate estimations from artificial neural network (ANN) models of heat exchangers used for refrigeration applications and present a methodology based on the cross-validation technique to find regions where not enough data are available to construct a reliable neural network.

TL;DR: In this article, a modified generalized integral transform technique was used to solve the energy equation for Laminar slip-flow forced convection in rectangular microchannels, assuming hydrodynamically fully developed flow.

TL;DR: In this article, the effect of higher-than-zero phase angle between consecutive tape elements has been studied, and the results showed that tape width and rod diameter were both varied.

TL;DR: In this article, the authors used the double-sensor probe and the hotfilm probe to measure local hydrodynamic parameters of vertical upward air-water flows in a round tube with an inner diameter of 50.8 mm.

TL;DR: In this paper, the authors investigated the effect of cell shape and cell arrangement on the heat transfer performance of lightweight panels with two-dimensional metal cores, with emphasis on the effects of varying cell morphologies and cell arrangements.

TL;DR: In this paper, the integral transform technique is used for convective heat transfer for steady state, laminar, hydrodynamically developed flow in microtubes with uniform temperature and uniform heat flux boundary conditions.

TL;DR: In this paper, a computational study of the effects of buoyancy-driven convection on constrained melting of phase change materials within spherical containers is presented, based on an iterative finite-volume numerical procedure using primitive-dependent variables, whereby the time-dependent continuity, momentum and energy equations in the spherical coordinate system are solved.

TL;DR: In this article, the effect of jet-to-jet spacing on the local Nusselt number for confined circular air jets vertically impinging on a flat plate has been investigated, and the existence of the (s/d)opt is attributed to jet interference before impingement and/or formation of jet fountain between two adjacent jets.

TL;DR: In this article, a study of pool boiling behavior using flat, microporous-enhanced square heater surfaces immersed in saturated FC-72 was conducted and the results showed that the nucleate boiling curves of the microporus coated surfaces were found to collapse to one curve showing insensitivity to heater orientation.

TL;DR: In this paper, the authors presented flow structure characteristics for a channel with a dimpled surface on one wall, both with and without protrusions (with the same shapes as the dimples) on the opposite wall.

TL;DR: In this article, the melting of an organic phase change material (PCM) n-triacontane (C30H62) in a side heated tall enclosure of aspect ratio 10, by a uniformly dissipating heat source was studied computationally and experimentally.

TL;DR: In this article, the presence of the electrical double layer near a solid-liquid interface results in the electro-viscous effect on pressure-driven liquid flow through micro-channels.

TL;DR: The artificial neural network (ANN) technique is extended to the simulation of the time-dependent behavior of a heat exchanger (HX) and used to control the temperature of air passing over it, which allows the system to reach steady-state operating conditions in regions where the PI and PID controllers are not able to perform as well.

TL;DR: In this paper, temperature-dependent phase-lags are incorporated in the dual-phase-lag model to fully describe the experimental data of femtosecond (fs) laser heating on gold films of various thicknesses in the sub-micron range.

TL;DR: In this article, the motion of bubbles and the temperature of the heated surface were recorded by a high-speed video camera and an infrared radiometer during nucleate pool boiling of pure water and water with cationic surfactant.

TL;DR: In this article, an experimental study on the airside performance of compact slit fin-and-tube heat exchangers was carried out, and the results indicated that the air-side performance for compact slotted fin geometry is relatively independent of the number of tube row and fin pitch.

TL;DR: In this paper, fractional pressure drops of single-phase water and steam-water two-phase flows were studied in a pressure range of 3.0-3.5 Mpa.

TL;DR: In this article, a three-start spirally corrugated tubes combined with five twisted tape inserts with different relative pitches in the range of Reynolds number 3×103-6×104.