Showing papers in "International Journal of Heat and Mass Transfer in 2009"

TL;DR: In this paper, the authors summarized the important published articles on the enhancement of the forced convection heat transfer with nanofluids, including simulations, simulations, and experimental results.

TL;DR: In this article, the Cheng-Minkowycz problem of natural convection past a vertical plate, in a porous medium saturated by a nanofluid, is studied analytically.

TL;DR: In this paper, a model was developed to account for the thermal conductivity of nanofluids as a function of temperature, particle volumetric concentration, the properties of nanoparticles, and the base fluid, which agrees well with the experimental data.

TL;DR: In this article, the authors measured the pressure drop and convective heat transfer coefficient of water-based Al2O3 nanofluids flowing through a uniformly heated circular tube in the fully developed laminar flow regime.

TL;DR: In this paper, the effect of particle size on convective heat transfer in laminar developing region was evaluated with alumina-water nanofluids in tube flow with constant heat flux.

TL;DR: In this paper, heat transfer and viscous pressure loss were investigated for alumina-water and zirconia-water nanofluids in a flow loop with a vertical heated tube.

TL;DR: In this article, the effect of dispersing energy (ultrasonication) on viscosity, thermal conductivity, and the laminar convective heat transfer was studied.

TL;DR: In this paper, an experimental study on the forced convective heat transfer and flow characteristics of a nanofluid consisting of water and 0.2 vol.% TiO2 nanoparticles was performed.

TL;DR: In this article, the onset of convection in a horizontal layer of a porous medium saturated by a nanofluid is studied analytically, and it is found that the critical thermal Rayleigh number can be reduced or increased by a substantial amount depending on whether the basic nanoparticle distribution is top-heavy or bottom-heavy, by the presence of the nanoparticles.

TL;DR: In this paper, the influence of surface wettability on nucleate boiling heat transfer was investigated and a new approach of nucleation mechanism was established to clarify the nexus between the surface wetability and the nucleate heating transfer.

TL;DR: The main features of the problems addressed with GAs including the modeling, number of variables, and GA settings are presented, useful for future use of GAs in heat transfer.

TL;DR: In this article, an experimental and computational investigation directed at understanding the role of buoyancy-driven convection during constrained melting of phase change materials (PCM) inside a spherical capsule is reported.

TL;DR: In this article, an integrated microsystem consisting of a single microchannel on one side, and two localized heaters and five polysilicon temperature sensors along the channel on the other side were fabricated.

TL;DR: In this article, a composite correlation is developed from a database of 3899 data points from 14 studies in the literature covering 12 different wetting and non-wetting fluids, hydraulic diameters ranging from 016 to 292mm, and confinement numbers from 03 to 40.

TL;DR: In this paper, the nucleate pool boiling heat transfer of a refrigerant-based nanofluid was investigated at different nanoparticle concentrations and pressures, and the results indicated that the boiling temperature of nucleate pools deteriorated with increasing particle concentrations, especially at high heat flux.

TL;DR: In this article, a model for morphology of liquid phase across multiple porous layers by use of both continuum and breakthrough (percolation) treatments was developed, and the results of this model showed the liquid morphologies deteriorate the efficiency of electrochemical reactions in CL and increase the water saturation in GDL.

TL;DR: In this article, the authors presented the dynamic modeling of a single effect two-bed adaption chiller utilizing the composite adsorbent "CaCl 2 confined to KSK silica gel" as an adsorbant and water as adsorbate, which is based on the experimentally confirmed adsorption isotherms and kinetics data.

TL;DR: In this article, a performance evaluation plot has been proposed, which takes the ratios of heat transfer enhancement and friction factor increase as its two coordinates, where the quadrant of the coordinate where both (Nue/Nu0), (fe/f0) are greater than 1.

TL;DR: In this paper, the bottom wall of a shallow rectangular micro-channel with carbon nanotubes (CNTs) was tested with a bare copper surface and three separate identical CNT-coated surfaces.

TL;DR: In this article, a novel photovoltaic/thermal solar-assisted heat pump (PV/T-SAHP) system is described, which is a specially designed directexpansion evaporator, which was laminated with PV cells on the front surface of the thermal absorber, has been adopted in our system to acquire simultaneously thermal energy and electricity from solar radiation.

TL;DR: In this paper, 13 prediction methods for flow boiling heat transfer in mini-channels were compared against a new database including 2505 data for 11 liquids covering diameter from 0.21 to 6.05mm.

TL;DR: In this article, experimentally determined pressure drop and heat transfer characteristics of flow of water in a 75-start spirally grooved tube with twisted tape insert are presented, and it is found that the direction of twist (clockwise and anticlockwise) influences the thermohydraulic characteristics.

TL;DR: In this article, the thermal and fluid-dynamic behavior of a single-pass and double-pass solar parabolic trough collector is analyzed in the presence of recycle at the ends.

TL;DR: In this paper, the thermal and fluid flow characteristics of five heat sinks that have been fabricated by a rapid manufacturing technique known as Selective Laser Melting are presented, and the experimental results for the rectangular fin were compared with data from the literature and were found to be consistent.

TL;DR: In this paper, the authors proposed a dual-phase model for bioheat equations with blood or tissue temperature as sole unknown temperature by eliminating the tissue or blood temperature from the nonequilibrium model and showed that the phase lag times for heat flux and temperature gradient are very close to each other.

TL;DR: In this paper, a numerical investigation of the steady magnetohydrodynamics free convection in a rectangular cavity filled with a fluid-saturated porous medium and with internal heat generation has been performed.

TL;DR: In this paper, the effects of thermal radiation on unsteady boundary layer mixed convection heat transfer problem from a vertical porous stretching surface embedded in porous medium was investigated and the analysis of the results obtained showed that the flow field is influenced appreciably by the unsteadiness parameter, mixed convective parameter, parameter of the porous medium and thermal radiation and suction at wall surface.

TL;DR: In this article, heat transfer coefficients for the nanofluid are presented for Reynolds numbers ranging from 3300 to 13,000 and are compared to the base fluid water on the bases of constant Reynolds number, constant velocity, and constant pumping power.

TL;DR: Wen et al. as discussed by the authors showed that the surface conditions are responsible for varying results of pool boiling and suggested that experiments can be fit to the traditional Rohsenow correlation by changing the surface constant, Csf.

TL;DR: In this paper, the influence of heat convection and internal heat generation on structural designs is investigated. But the authors focus on the influence on the heat transfer coefficient and heat conduction on the structure surface.