Showing papers in "International Journal of Thermal Sciences in 2007"

TL;DR: A review on fluid flow and heat transfer characteristics of nanofluids in forced and free convection flows is presented in this article, where the authors identify opportunities for future research.

TL;DR: In this paper, a simple theoretical analysis that indicated more energy and lower MCHS wall temperature could be obtained under the assumption that heat transfer could be enhanced by the presence of nanoparticles was carried out.

TL;DR: In this paper, a lattice Boltzmann algorithm for fluid-solid conjugate heat transfer is developed and a new generalized heat generation implement is presented and a "half lattice division" treatment for the fluid solid interaction and energy transport is proposed, which insures the temperature and heat flux continuities at the interface.

TL;DR: In this paper, the authors investigated the use of CFD in predicting performance of a steam ejector used in refrigeration applications and found that CFD was not only a sufficient tool in predicting ejector performance but also provided a better understanding in the flow and mixing processes within the ejector.

TL;DR: Loop heat pipes (LHPs) are heat transfer devices whose operating principle is based on the evaporation/condensation of a working fluid, and which use the capillary pumping forces to ensure the fluid circulation as discussed by the authors.

TL;DR: In this article, the authors presented an original experimental study on compound heat transfer enhancement in a tube fitted with serrated twisted tape and found that the heat transfer augmentation attributed to the twisted tape falls in the range of 250-480% of the plain-tube level.

TL;DR: The aim of this study is to reveal the complication of the flow and the mixing process of a steam ejector used in a jet refrigeration cycle by using the simulation software package (FLUENT).

TL;DR: The nude body model is integrated to an existing clothing model based on heat and mass diffusion through the clothing layers and takes into consideration the moisture adsorption by the fibers, capable of predicting accurately nude human transient physiological responses such as the body's skin, tympanic, and core temperatures, sweat rates, and the dry and latent heat losses from each body segment.

TL;DR: In this paper, the thermal properties of 1 × 1 rib fabrics knitted by using various yarns of different properties were investigated with all details, the mentioned yarn properties were yarn count, yarn twist and combing process.

TL;DR: In this article, a detailed numerical model is presented to study heat transfer in liquids as they flow continuously in a circular duct that is subjected to microwave heating, and three types of food liquids are investigated: apple sauce, skim milk, and tomato sauce.

TL;DR: In this paper, the authors investigated the natural convection heat transfer of nano-fluids in a laminar external boundary layer from the integral formalism approach and found that the sensitivity to the viscosity model played a key role in the heat transfer behavior.

TL;DR: In this paper, a full set of numerical methods for predicting the effective thermal conductivity of natural fibrous materials accurately, including a random generation-growth method for generating micro morphology based on existing statistical macroscopic geometrical characteristics and a highly efficient lattice Boltzmann algorithm for solving the energy transport equations through the fibrous material with the multiphase conjugate heat transfer effect considered.

TL;DR: In this paper, the exergetic performance of concentrating type solar collector is evaluated and the parametric study is made using hourly solar radiation and the exergy output is optimized with respect to the inlet fluid temperature and the corresponding efficiencies are computed.

TL;DR: The effect of radiation heat transfer on the natural convection heat transfer from a porous fin attached to a vertical isothermal surface has been investigated in this paper, where the governing equations are reduced to a single nonlinear ordinary differential equation.

TL;DR: In this paper, the authors investigated the thermal non-equilibrium model of convection, conduction and radiation in a saturated porous medium enclosed in a square cavity using the finite element method.

TL;DR: In this article, the authors focused on the numerical study of steady, laminar, conjugate natural convection in a square enclosure with an inclined thin fin of arbitrary length.

TL;DR: In this paper, the effect of viscous dissipation and thermal radiation on natural convection in a porous medium embedded within a vertical annular cylinder is investigated, where the inner surface of the cylinder was maintained at an isothermal temperature T w and the outer surface is maintained at ambient temperature T ∞.

TL;DR: In this paper, the authors investigated steady mixed convection in a square lid-driven cavity under the combined buoyancy effects of thermal and mass diffusion and solved the transport equations numerically using the Galerkin weighted residual method.

TL;DR: In this article, a stochastic particle swarm optimizer (SPSO) algorithm is used to estimate the parameters of radiation system, which can guarantee the convergence of the global optimization solution with probability one.

TL;DR: Li et al. as discussed by the authors performed three-dimensional numerical simulations for laminar flow of wavy fin-and-tube heat exchangers by using body-fitted coordinates (BFC) method with fin efficiency effect accounted.

TL;DR: In this paper, a two-stage transcritical carbon dioxide heat pump cycles, incorporating options such as flash gas bypass, flash intercooling, and compressor inter cooling, are presented based on cycle simulation.

TL;DR: In this article, the authors examined laminar forced convective heat transfer of a Newtonian fluid in a microchannel between two parallel plates analytically, including viscous dissipation effect, the velocity slip and the temperature jump at the wall.

TL;DR: In this paper, the authors investigated the characteristics of an air-water isothermal two-phase flow in minichannels, that is, in capillary tubes with inner diameters of 1 mm, 24 mm, and 49 mm.

TL;DR: In this paper, the interaction of free convection with thermal radiation of a viscous incompressible unsteady flow past an impulsively started vertical plate with heat and mass transfer is analyzed.

TL;DR: In this article, a numerical investigation of laminar convective flows in a differentially heated, square enclosure with a heat-conducting cylinder at its center is carried out, where the flow and the temperature are computed using respectively the lattice Boltzmann equation and finite-difference with suitable coupling to take natural convection into account.

TL;DR: Guo et al. as discussed by the authors used the Levenberg-Marquardt method to estimate a Gaussian source term in a two-dimensional heat transfer problem for electron beam welding.

TL;DR: In this article, the mesoscopic models for the ferrofluid were developed to simulate flow and thermal processes of the ferroglobal fluid flowing through a micro channel using the lattice-Boltzmann method.

TL;DR: In this article, the Darcy model is used in the mathematical formulation for the porous layer and finite volume method is used to solve the dimensionless governing equations, and the results including the streamlines and isotherm patterns and the local and average Nusselt number for different values of the governing parameters.

TL;DR: In this paper, a thin-film gold/titanium (Au/Ti) microheater was developed for microthruster ignition, micro explosive boiling, and micro sensor applications.

TL;DR: In this paper, a two-dimensional solution of natural convection in solid adiabatic thin fin attached to porous right triangular enclosures has been analyzed numerically, where the vertical wall of the enclosure is insulated while the bottom and the inclined walls are isothermal.