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Showing papers in "International Communications in Heat and Mass Transfer in 2008"


Journal ArticleDOI
TL;DR: In this paper, the authors investigated the effect of different types and volume fractions of nanoparticles on heat transfer in horizontal annuli using nanofluids and found that nanoparticles with high thermal conductivity caused significant enhancement of heat transfer characteristics.

474 citations


Journal ArticleDOI
TL;DR: In this paper, the Optimal Homotopy Asymptotic Method (OHAM) is used to solve nonlinear equations arising in heat transfer, which provides a convenient way to control the convergence of approximation series and adjust convergence regions when necessary.

375 citations


Journal ArticleDOI
TL;DR: In this paper, the effect of radiation on the boundary layer flow and heat transfer of a viscous fluid over an exponentially stretching sheet is studied and the homotopy analysis method (HAM) is employed to determine the convergent series expressions of velocity and temperature.

357 citations


Journal ArticleDOI
TL;DR: In this article, the entropy generation in rectangular cavities with the same area but different aspect ratios is numerically investigated and the variation of the total entropy generation and average Bejan number for the whole cavity volume at different aspects ratios for different values of the Rayleigh number and irreversibility distribution ratio are also evaluated.

291 citations


Journal ArticleDOI
TL;DR: In this paper, a two-dimensional asymmetric channel with peristaltic wave train on the walls to have different amplitudes and phase was investigated. And the effect of Hartmann number, Eckert number, width of the channel and phase angle on temperature and coefficient of heat transfer were discussed numerically and explained graphically.

275 citations


Journal ArticleDOI
TL;DR: In this article, the authors summarize the various models for predicting the thermophysical properties of nanofluids which have been commonly cited by a number of researchers and use them to calculate the experimental convective heat transfer coefficient of the nanoparticles flowing in a double-tube counter flow heat exchanger.

231 citations


Journal ArticleDOI
TL;DR: In this paper, a heat pipe with de-ionic water, alcohol, and nanofluids (alcohol and nanoparticles) was fabricated from the straight copper tube with the outer diameter and length of 15, 600 mm, respectively.

230 citations


Journal ArticleDOI
TL;DR: In this article, two rib arrangements, namely, in-line and staggered arrays, are introduced to assess turbulent forced convection heat transfer and friction loss behaviors for air flow through a constant heat flux channel fitted with different shaped ribs.

196 citations


Journal ArticleDOI
TL;DR: In this paper, the phase change material (PCM) inside a sphere using n-Octadecane was investigated for both constrained and unconstrained melting, in which the solid PCM was restrained from sinking to the bottom of the sphere.

181 citations


Journal ArticleDOI
TL;DR: In this article, a numerical investigation of turbulent forced convection in a two-dimensional channel with periodic transverse grooves on the lower channel wall is conducted, where the lower wall is subjected to a uniform heat flux condition while the upper wall is insulated.

168 citations


Journal ArticleDOI
TL;DR: In this article, the authors investigated the effect of inserting a louvered strip into a concentric tube heat exchanger to generate turbulent flow which helped to increase the heat transfer rate of the tube.

Journal ArticleDOI
TL;DR: In this paper, the authors studied the entropy generation for natural convection in a partitioned cavity, with adiabatic horizontal and isothermally cooled vertical walls, by both a FORTRAN code and the commercially available CFD-ACE software.

Journal ArticleDOI
TL;DR: In this article, a gas-solid fluidized bed reactor has been simulated applying CFD techniques in order to investigate hydrodynamic and heat transfer phenomena in a bimodal particle mixture.

Journal ArticleDOI
TL;DR: In this article, a computer code has been developed to study the turbulent heat transfer and friction in a square duct with various-shaped ribs mounted on one wall, and simulations were performed for four rib shapes, i.e., square, triangular, trapezoidal with decreasing height in the flow direction, and trapezoid with increasing height in flow direction.

Journal ArticleDOI
TL;DR: In this paper, the non-uniform heat source/sink effect on the flow and heat transfer from an unsteady stretching sheet through a quiescent fluid medium extending to infinity is studied.

Journal ArticleDOI
TL;DR: In this paper, an experimental investigation was performed to study the shell and helically coiled tube heat exchangers with different coil pitches and curvature ratios for both parallel-flow and counter-flow configurations.

Journal ArticleDOI
TL;DR: A theoretical approach based on molecular dynamics modeling, for the estimation of the enhancement of the thermal conductivity of liquids by the introduction of suspended metallic nanoparticles is proposed in this article, where algorithms are developed for simulating the nanofluid abiding the procedural steps of the molecular dynamics method.

Journal ArticleDOI
TL;DR: In this article, the problem of steady natural convection flow through a fluid-saturated porous medium in a rectangular enclosure with a sinusoidal varying temperature profile on the bottom wall was conducted.

Journal ArticleDOI
TL;DR: In this article, a simultaneous visualization and measurement study has been carried out to investigate stable and unstable flow boiling phenomena of deionized water in a single microchannel having a hydraulic diameter of 155 µm with a bottom Pyrex glass wall.

Journal ArticleDOI
TL;DR: In this paper, the effects of the insertion of coiled wires in conjunction with a snail-type swirl generator mounted at the tube entrance on heat transfer and turbulent flow friction characteristics in a uniform heat-flux, circular tube are experimentally investigated.

Journal ArticleDOI
TL;DR: In this paper, two new analytical methods to solve nonlinear heat transfer equations are homotopy perturbation method and homotropic analysis method and analytical results are compared with those of HPM and numerical results.

Journal ArticleDOI
TL;DR: In this paper, a three-dimensional numerical model of the microchannel heat sink is presented to study the effects of heat transfer characteristics due to various channel heights and widths, based on the theory of a fully developed flow.

Journal ArticleDOI
TL;DR: In this article, the authors studied the entropy generation due to conjugate natural convection heat transfer and fluid flow inside an enclosure with bounded by two solid massive walls from vertical sides at different thicknesses.

Journal ArticleDOI
TL;DR: In this article, the authors investigated and improved thermal performance of evacuated compound parabolic concentration (CPC) solar collector with a cylindrical absorber, and concluded that the numerical model can accurately estimate the performance of solar collectors.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the effect of turbulence model applications on two-phase flow simulation in a structured packing using CFD application, and the mean absolute relative error (MARE) between CFD prediction of k-ω model and experimental data for dry pressure drop, irrigated pressure drop and heat transfer were 16.9, 10.7, 8.1, 0.9%, respectively.

Journal ArticleDOI
TL;DR: In this article, an exact solution for the steady state Navier-Stokes equations in cylindrical coordinates is presented by similarity transformation technique, which involves the flow between two stretchable infinite disks with accelerated stretching velocity.

Journal ArticleDOI
TL;DR: In this paper, the partial differential equations governing the problem under consideration have been transformed by a similarity transformation into a system of ordinary differential equations which are solved numerically by applying the shooting method.

Journal ArticleDOI
TL;DR: In this paper, the authors compared numerical and experimental results of moisture transfer in drying process for apple and potato slices are compared in comparison with a cyclone type dryer and showed that there is a considerably high agreement between experimentally measured data and predicted values.

Journal ArticleDOI
TL;DR: In this article, the effects of cross-buoyancy and of Prandtl number on the flow and heat transfer characteristics of an isothermal square cylinder confined in a channel has been investigated.

Journal ArticleDOI
TL;DR: In this paper, low cost coaxial surface junction thermocouples (CSJTs) have been fabricated in-house and calibrated to measure the transient surface temperature rise within a UNITEN's shock tube wall facility, consisting of K-type coaxial thermocouple elements.