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Showing papers in "International Journal of Heat and Mass Transfer in 2012"


Journal ArticleDOI
TL;DR: In this paper, a detailed review on theoretical models/correlations of conventional models related to nanofluid viscosity is presented, and the existing experimental results about the Nanofluids viscoities show clearly that viscoity augmented accordingly with an increase of volume concentration and decreased with the temperature rise.

527 citations


Journal ArticleDOI
TL;DR: In this paper, the state-of-the-art knowledge and research results of thermal transport in open celled cellular metal foams, which covers the effective thermal conductivity, forced convection, natural convection and thermal radiation, pool boiling and flow boiling heat transfer, solid/liquid phase change heat transfer and catalytic reactor were provided.

374 citations


Journal ArticleDOI
TL;DR: In this article, a comprehensive analysis has been performed to evaluate the effects on the performance of nanofluids due to variations of density, specific heat, thermal conductivity and viscosity, which are functions of nanoparticle volume concentration and temperature.

308 citations


Journal ArticleDOI
Rahman Saidur1, T.C. Meng1, Zafar Said1, Md. Hasanuzzaman1, A. Kamyar1 
TL;DR: In this paper, the extinction coefficient of water-based aluminum nanofluid has been investigated and evaluated by varying nanoparticle size and volume fraction and the improvement is promising within 1.0% volume fraction.

275 citations


Journal ArticleDOI
TL;DR: In this paper, a review of the numerical studies performed in this area including conventional numerical methods as well as the new Lattice Boltzmann Method (LBM) is presented.

250 citations


Journal ArticleDOI
TL;DR: In this article, a lattice Boltzmann model for the liquid-vapor phase change heat transfer is proposed and the problem of bubble growth and departure from a horizontal surface is solved numerically based on the proposed model.

242 citations


Journal ArticleDOI
TL;DR: In this article, the phase change material (PCM) used in this study is n-eicosane and is placed inside a heat sink made of aluminium, which acts as thermal conductivity enhancer.

231 citations


Journal ArticleDOI
TL;DR: In this paper, a set of model scale experiments were carried out, to investigate the influence of different transverse fire locations on maximum smoke temperature under the tunnel ceiling, and the results showed that the restriction effect of the sidewalls of tunnels cause the maximum smoke temperatures under the ceiling to increase compared with the unconfined space, even fires occurs at the longitudinal centerline.

227 citations


Journal ArticleDOI
TL;DR: In this article, a new consolidated database of 7115 frictional pressure gradient data points for both adiabatic and condensing mini/micro-channel flows is amassed from 36 sources.

224 citations


Journal ArticleDOI
TL;DR: In this article, simulated copper chips were used in a pool boiling setup with water boiling at atmospheric pressure, and the results showed that the mechanism at work for the bubble dynamics was the ability of the surface to pull liquid through the channels to induce heat transfer.

210 citations


Journal ArticleDOI
TL;DR: In this article, five different structures, namely SWNT, DWNT, FWNT, and two different multiwalls were applied in order to investigate the dependence of carbon nanotube (CNT) structures in water-based nanofluid, as well as their dependence to temperature and time variation.

Journal ArticleDOI
TL;DR: In this article, the Nusselt number and the drag coefficient for cuboid, spherical and ellipsoidal particles in steady-state regimes corresponding to Reynolds numbers (Re ) from 10 up to 250 were investigated.

Journal ArticleDOI
TL;DR: In this article, the effects of thermal radiation on the flow of micropolar fluid and heat transfer past a porous shrinking sheet is investigated and self-similar ODEs are obtained using similarity transformations from the governing PDEs and are then solved numerically by very efficient shooting method.

Journal ArticleDOI
TL;DR: In this paper, a statistical narrow-band (SNB) model for H2O, CO2, CH4 and CO, and correlated-k (CK) parameters for H 2O and CO2 are generated from line by line calculations and recently improved spectroscopic databases in wide temperature and spectral ranges.

Journal ArticleDOI
TL;DR: In this article, the effect of micro-pin fin shapes on the performance of small-scale cooling apparatuses is investigated. But, the authors focus on the micro-minichannel.

Journal ArticleDOI
TL;DR: In this paper, the effect of temperature on hydrodynamic size distribution and zeta potential during heating and cooling cycle has been investigated to elucidate its role on dispersion characteristics.

Journal ArticleDOI
TL;DR: In this article, the thermal conductivity of methanol-based nanofluids with Al 2 O 3 and SiO 2 nanoparticles was measured using an ultrasonic equipment.

Journal ArticleDOI
TL;DR: In this article, the authors investigated the convective heat and mass transfer in nanofluid flow over a stretching sheet subject to hydromagnetic, viscous dissipation, chemical reaction and Soret effects.

Journal ArticleDOI
TL;DR: In this paper, the effects of emerging fluid parameters (ϵ, (δ) and Prandtl number (Pr) on the velocity and temperature are illustrated through graphs and tables for different values of λ.

Journal ArticleDOI
TL;DR: In this article, the authors present numerical computation results on turbulent flow and coupled heat transfer enhancement in a novel parabolic trough solar absorber tube, where longitudinal vortex generators (LVGs) are only located on the side of the absorbing tube with concentrated solar radiation.

Journal ArticleDOI
TL;DR: In this article, the Galerkin finite element method has been employed to solve momentum and energy balance as well as post processing streamfunctions and heatfunctions in the presence of hot and cold side walls.

Journal ArticleDOI
TL;DR: In this paper, a 3D microchannel heat sink (MCHS) using nanofluids is investigated by a numerical study, and the authors suggest that the best heat transfer enhancement can be obtained by using a system with an Al 2 O 3 -water-water-nano-cooled MCHS, and that using base fluids with lower dynamic viscosity (such as water) and substrate materials with high thermal conductivity enhance the thermal performance.

Journal ArticleDOI
TL;DR: In this article, the unsteady boundary layer flow of a nanofluid over a permeable stretching/shrinking sheet is theoretically studied, and the governing partial differential equations are transformed into ordinary ones using a similarity transformation, before being solved numerically.

Journal ArticleDOI
TL;DR: In this paper, a fully coupled CFD model (COMSOL Multiphysics) is developed to describe an intermediate temperature SOFC single cell, including governing equations for heat, mass, momentum and charge transport as well as kinetics considering the internal reforming and the electrochemical reactions.

Journal ArticleDOI
TL;DR: In this paper, a double-layered micro-channel heat sink was investigated and the effects of substrate materials, coolants, and geometric parameters such as channel number, channel width ratio, channel aspect ratio, substrate thickness, and pumping power on the temperature distribution, pressure drop, and thermal resistance were discussed.

Journal ArticleDOI
TL;DR: In this paper, nano-silica particle coatings were used to vary the surface wettability of the copper surface from superhydrophilic to super-hydrophobic by modifying surface topography and chemistry.

Journal ArticleDOI
TL;DR: In this paper, the effect of vertical shaft height on natural ventilation in urban road tunnel fires was investigated, and two special phenomena, plug-holing and turbulent boundary-layer separation were observed, both of which will influence the impact of smoke exhaust.

Journal ArticleDOI
TL;DR: In this article, a scale model of an 0.8m cubic fire compartment with six window-like geometries and an attached 3m (wide) × 5m (high) facade wall was used.

Journal ArticleDOI
TL;DR: In this paper, the authors studied flow and heat transfer in periodic wavy channels with rectangular cross sections using direct numerical simulation, for increasing Reynolds numbers spanning from the steady laminar to transitional flow regimes.

Journal ArticleDOI
TL;DR: In this paper, a micro-scale cross-flow heat exchanger is constructed from a hollow nickel micro lattice structure, which is fabricated by conformally electroplating nickel onto a sacrificial polymer micro-lattice formed from self-propagating photopolymer waveguides.