Showing papers in "International Journal of Heat and Mass Transfer in 1997"

TL;DR: In this paper, the authors developed a solution to the fundamental problem of how to collect and "channel" to one point the heat generated volumetrically in a low conductivity volume of given size.

TL;DR: In this paper, a temperature wall function was derived for variable-density turbulent flows that are commonly found in internal combustion engines, and the results showed that the effects of unsteadiness and heat release due to combustion were insignificant for the cases considered.

TL;DR: In this article, a generalised non-Darcian porous medium model for natural convective flow has been developed taking into account linear and non-linear matrix drag components as well as the inertial and viscous forces within the fluid.

TL;DR: In this paper, a generalized heat transfer correlation for louver fin geometry is developed with the aid of a large data bank consisting of 91 samples of louvered fin heat exchangers with different geometrical parameters.

TL;DR: In this article, the effects of the EDL at the solid-liquid interface on liquid flow and heat transfer through a microchannel between two parallel plates at constant and equal temperatures were investigated.

TL;DR: In this article, still and high-speed photographic techniques were used to record the impact behavior of water droplets on a hot aluminum surface, and heat transfer regimes corresponding to film boiling, transition boiling, nucleate boiling, and film evaporation were identified.

TL;DR: In this article, it was concluded that molecular collision and heat transfer limitations can have a considerable influence on experimental evaporation rates and thus apparent evapore coefficients, however, it now seems unlikely that molecular structure has a major effect on this coefficient.

TL;DR: In this article, the temperature dependence of the quasistatic advancing contact angle of water on an aluminum surface polished in accordance with surface preparation techniques commonly employed in boiling heat transfer studies was investigated.

TL;DR: In this article, the Nusselt number distributions for a two-pass square channel with one ribbed wall are presented for a thermochromic liquid crystals, and detailed measurements are presented in the first pass, before the 180° turn, in the turn region, after the turn and further downstream in the second pass.

TL;DR: In this article, a two-equation turbulence model for incompressible flow within a fluid saturated and rigid porous medium is presented, which consists of time-averaging the general (macroscopic) transport equations and closing the model with the classical eddy diffusivity concept and the Kolmogorov-Prandtl relation.

TL;DR: In this paper, an analytical model is developed for the formulation of a frost layer on a cold flat surface by considering the molecular diffusion of water, and heat generation due to the sublimation of water-vapor in the frost layer.

TL;DR: In this paper, the effect of expanded metal mesh geometry on the heat transfer coefficient and friction factor has been investigated for fully developed turbulent flow in a rectangular duct with large aspect ratio (11: 1).

TL;DR: In this article, the performance of micro-porous enhanced surfaces using five different sizes of diamond particles was studied using one-dimensional transient thermal conduction (TTC) to calculate the superheated liquid layer thickness.

TL;DR: In this article, the boiling performance of micro-porous-enhanced surface is compared with that of the commercial High Flux surface, and two different coating methods are researched and nearly identical boiling performances are obtained with the optimized coating composition.

TL;DR: In this paper, the effect of slip-flow on the convection heat transfer coefficient was investigated and a special technique was developed to evaluate the eigenvalues for the problem, where the authors developed simplified relationships to describe the relationship between slip flow and heat transfer coefficients.

TL;DR: In this paper, the impact and solidification of molten solder droplets on a multi-layer substrate is studied. But the model is based on a Lagrangian formulation, and accounts for a host of thermal-fluid phenomena, including surface tension and heat transfer with solidification.

TL;DR: In this article, the heat transfer conditions that apply at the boundary between a porous medium and a homogeneous fluid are developed as flux jump conditions based on the non-local form of the volume averaged thermal energy equations for both the fluid and the solid.

TL;DR: In this article, a one-dimensional transient formulation is derived to predict frost growth and densification on a cold wall submitted to a moist air flow, based on a local volume averaging technique that allows the computation of temperature and density distributions throughout the entire frost layer according to time.

TL;DR: In this paper, a genetic algorithm is proposed to optimize the thermal performances of finned surfaces by resorting to the finite elements method, and the optimal profile is finally shown for different polynomial orders.

TL;DR: In this article, the velocity and temperature in the stagnation region of an impinging plane jet were simultaneously measured by digital particle image velocimetry and laser-induced fluorescence.

TL;DR: In this article, the authors examined the effects of chaotic advection on heat transfer at low Reynolds numbers, and they showed that chaotic trajectories substantially homogenize and enhances heating and that the homogeneity of heating is almost independent of the Reynolds number.

TL;DR: In this paper, an extended Kays and Crawford (Convective Heat and Mass Transfer, 3rd edn. McGraw-Hill, New York, 1993) turbulent Prandtl number model is used for accurately predicting the heat transfer for liquid metal flows.

TL;DR: In this paper, an empirical approach to determining film boiling heat transfer of a spray from extrapolation of the heat transfer characteristics of an isolated droplet stream is presented, where correlations are presented for film boiling transfer rate and droplet heat transfer efficiency over a wide range of operating conditions.

TL;DR: In this paper, the Merk-Chao series expansion is used to generate ordinary differential equations from the partial differential momentum equation in order to obtain universal velocity functions for non-Newtonian power law fluid.

TL;DR: In this article, the axial void fraction profiles in subcooled flow boiling in a vertical annulus were obtained using gamma attenuation techniques for different levels of mass flux, wall heat flux and inlet subcooling.

TL;DR: In this article, a mixed explicit/implicit discretization of the temperature-solute coupling equations is presented, which can model the solidification of multicomponent alloys for a wide range of local scale behaviors.

TL;DR: In this article, an experimental study on heat transfer behaviors of a confined slot jet impingement has been systematically performed and the parametric effects of jet Reynolds numbers and jet separation distance on the heat transfer characteristics of the heated target surface are explored.

TL;DR: In this paper, an incompressible fluid flow across a bank of circular cylinders is studied and modeled as a non-Darcy flow through a porous medium, where the continuity equation and the momentum equation in pore scale are solved on a Cartesian grid system.

TL;DR: In this article, a measurement of the local Nusselt number of a confined circular air jet vertically impinging on a flat plate is performed, where only part of the impinging surface is maintained at a constant heat flux condition and the rest is adiabatic.