Showing papers in "International Communications in Heat and Mass Transfer in 2009"

TL;DR: In this article, an improved functionality of phase change materials (PCM) through dispersion of nanoparticles is described, which exhibit enhanced thermal conductivity in comparison to the base material.

TL;DR: In this article, phase change material embedded by nanoparticles was prepared by emulsifying alumina (Al 2 O 3 ) nanoparticles in paraffin (n-octadecane) by means of a non-ionic surfactant.

TL;DR: In this article, the authors present an experimental study on the mean Nusselt number, friction factor and enhancement efficiency characteristics in a round tube with short-length twisted tape insert under uniform wall heat flux boundary conditions.

TL;DR: In this paper, a regression equation is developed to estimate the Nusselt number valid for both water and nanofluid flowing in the transition flow Reynolds number range in circular plain tube and with tape inserts.

TL;DR: In this paper, it was shown that for a given inclination angle (φ), as the value of Hartmann number (Ha) increases, the convection heat transfer reduces.

TL;DR: In this article, the authors used a simulation method called the Differential Transformation Method (DTM) to solve the fin efficiency of convective straight fins with temperature-dependent thermal conductivity.

TL;DR: In this article, the authors applied a mathematical model for simulation of the swirling flow in a tube induced by loose-fit twisted tape insertion and found that the results were in better agreement with Manglik and Bergles than other turbulence models.

TL;DR: In this article, the authors discussed the calculation methods of the lighting's heat transfer and demonstrated an example of cooling of LEDs lighting in this paper, showing that the operation package heat transfer enhancement is required by most package manufacturers with a decrease of 20% ~ 30% of the thermal resistance over conventional package geometries.

TL;DR: In this paper, the effects of the pitch and twist ratio on the average heat transfer coefficient and the pressure loss are determined in a circular tube with the fully developed flow for the Reynolds number in the range of 12,000 to 44,000.

TL;DR: In this article, three dimensional numerical simulations are performed on laminar heat transfer and fluid flow characteristics of a flat-plate channel with longitudinal vortex generators (LVGs), and the effects of two different shaped LVGs, rectangular winglet pair (RWP) and delta winglet pairs (DWP) with two different configurations, common-flow-down (CFD) and commonflow-up (CFU), are studied.

TL;DR: In this paper, the effect of radiation on the heat and fluid flow over an unsteady stretching surface is analyzed using a similarity transformation, where the governing time dependent boundary layer equations for momentum and thermal energy are reduced to a set of ordinary differential equations.

TL;DR: In this paper, the effects of different baffle tip angles on heat transfer and pressure loss in a two dimensional horizontal channel with isothermal walls and with staggered diamond-shaped baffles are investigated numerically.

TL;DR: In this paper, a three-dimensional model of heat transfer and fluid flow in noncircular microchannel heat sinks is developed and analyzed numerically, and the results indicate that the triangular microchannel has the highest thermal efficiency.

TL;DR: In this paper, the authors presented a numerical study on laminar forced convection of water in offset strip-fin microchannels network heat sinks for microelectronic cooling.

TL;DR: In this paper, the liquid cooling in the mini-rectangular fin heat sink with and without thermoelectric for CPU is studied and the results of this study are expected to lead to guidelines that will allow the design of the cooling system with improved heat transfer performance of the electronic equipments.

TL;DR: In this article, the authors presented results of an experimental study of heat transfer and friction in a rectangular section duct with fully perforated baffles (Open area ratio of 46.8%) or half perforations (Open Area Ratio of 26%) at relative roughness pitch of 7.2-28.8 affixed to one of the broader walls.

TL;DR: In this paper, the authors developed an improved model of the human thermal system using 15 cylindrical elements, which includes heat transfer between large arteries and veins, and the results of thermal neutrality and transient simulations are in excellent agreement with experimental data.

TL;DR: In this article, the hydrodynamic characteristics and distribution of flow in two cross-corrugated channels of plate heat exchangers have been investigated, and the velocity, pressure and flow distribution of the fluid among the two channels of the plate heat exchange has also been presented.

TL;DR: In this paper, the combined effects of rib-grooved turbulators on the turbulent forced convection heat transfer and friction characteristics in a rectangular duct under a uniform heat flux boundary condition were examined.

TL;DR: In this paper, the authors investigated the enhancement of the heat and mass transfer characteristics for a NH 3 /H 2 O bubble absorption process using the CNTs-ammonia binary nanofluid as a working medium.

TL;DR: In this article, two rib arrangements, namely, in-line and staggered arrays, were introduced, and the experimental results show a significant effect of the presence of the ribs on the heat transfer rate and friction loss over the smooth wall channel.

TL;DR: In this paper, a numerical study was conducted to investigate the fluid flow and heat transfer of an air-cooled metal foam heat exchanger under the high speed laminar jet confined by two parallel walls for which the range of the Reynolds number is 600-1000.

TL;DR: In this article, a heat exchanger tube equipped with propeller type swirl generators at several pitch ratios (PR) was investigated for the Reynolds number ranging from 4000 to 21,000 under a uniform heat flux condition, and the experiments were also undertaken for several blade numbers of the propeller (N = 4, 6, and 8 blades) and for different blade angles (θ,= 30°, 45°, and 60°).

TL;DR: In this article, an experimental study on turbulent convective heat transfer with molten salt in a circular tube was conducted, where the flow rates and temperatures of molten salt and mineral oil at the inlet and outlet in the test section were measured.

TL;DR: In this paper, the authors investigated the fluid flow and heat transfer in the mini-rectangular fin heat sink for CPU of PC using de-ionized water as working fluid, and the results of this study are expected to lead to guidelines that will allow the design of the cooling system with improved cooling performance of electronic equipments increasing reliable operation of these devices.

TL;DR: In this article, a numerical study is conducted to investigate the steady free convection flow in a two-dimensional right-angle trapezoidal enclosure filled with a fluid-saturated porous medium.

TL;DR: In this paper, the Soret and Dufour effects on the boundary layer flow due to natural convection heat and mass transfer over a downward-pointing vertical cone in a porous medium saturated with Newtonian fluids with constant wall temperature and concentration were studied.

TL;DR: In this paper, an incompressible laminar flow of a couple stress fluid in a porous channel with expanding or contracting walls is considered, and the governing equations are reduced to nonlinear ordinary differential equations.

TL;DR: In this article, the effects of different geometrical configurations parameters of the micro-channel and heat flux on the heat transfer characteristics and pressure drop were investigated for constant heat flux conditions.

TL;DR: In this paper, the free convective flow of heat generating/absorbing fluid between vertical parallel porous plates due to periodic heating of the porous plates was investigated by considering fully developed flow and steady-periodic regime.