Showing papers in "International Journal of Heat and Mass Transfer in 1990"

TL;DR: The thermal dispersion conductivity tensor for convection in a porous medium is derived based on the method of volume averaging of the velocity and temperature deviations in the pores.

TL;DR: In this article, Radiative exchanges are calculated with the assumption of diffuse surfaces and with use of a viewed and hidden part algorithm together with a Galerkin discretization.

TL;DR: In this paper, the authors investigated the heat transfer coefficients on interior building surfaces (such as vertical walls, ceilings and glazing) using a real-sized indoor test cell which measures 2.95 × 2.08 m (length × width × height) and a total of 142 tests, each one lasting about 24 hours, were conducted under controlled steady-state conditions to cover nine of the most widely used heating configurations in buildings.

TL;DR: In this paper, new models for deposition and entrainment in annular flow are applied to a variety of conditions, such as steady adiabatic flow, flow with evaporation and flow with dryout and post-dryout regions.

TL;DR: In this paper, the authors investigated flow patterns and mass transfer characteristics in symmetrical two-dimensional wavy-walled channels at moderate Reynolds numbers : 20-300 for the sinusoidal wall and arc-shaped wall.

TL;DR: In this paper, a code bidimensionnel de calcul des transferts couples de chaleur, de masse and de quantite de mouvement en milieu poreux is presented.

TL;DR: In this article, the transient forced convective condensing flow of a gas through a packed bed is analyzed and the model developed for this analysis does not employ any local thermal equilibrium assumption between the solid and the fluid phases.

TL;DR: In this article, a numerical study of combustion and multimode heat transfer in porous radiant burners is performed using a one-dimensional conduction, convection, radiation, and premixed flame model.

TL;DR: In this article, the authors examined the influence of the dynamic solid/liquid contact angle and contact angle hysteresis on the incipience superheat of highly-wetting liquids and found that variations in contact angle induced by changes in the direction and magnitude of the liquid/vapor interface velocity can substantially affect the formation of bubble embryos.

TL;DR: In this paper, heat and mass transfer in a metal hydride bed is modeled and the effect of augmenting heat conduction and hydrogen flow governed by Darcy's law modified for the transitional flow regime is demonstrated.

TL;DR: In this paper, the critical heat flux (CHF) of subcooled flow boiling is analyzed based on the liquid sublayer dryout mechanism, assuming that it is a similar phenomenon to CHF in pool boiling except for apparent differences between forced and natural convection.

TL;DR: In this article, two important aspects of fluid-particulate interaction in dilute gas-particle turbulent flows (the turbulent particle dispersion and the turbulence modulation effects) are addressed, using the Eulerian and Lagrangian modeling approaches to describe the particulate phase.

TL;DR: In this paper, the Reynolds shear stress and heat flux distributions at a number of streamwise stations in a heated circular jet into still air indicate that the flow is approximately self-preserving at x d = 15.

TL;DR: In this paper, experiments were performed to determine the convective heat transfer coefficients for water cooling of inline and staggered arrays of 30 heated protruding elements arranged in six rows, and the data for all spacings were correlated using an array Reynolds number which accounts for a partitioning of the flow into bypass and array flows.

TL;DR: In this paper, a numerical analysis of the overall performance of a heat pipe with single or multiple heat sources is presented, which includes the heat conduction in the wall and liquid-wick regions as well as the compressibility effect of the vapor inside the heat pipe.

TL;DR: In this paper, a model satisfying the near-wall balance between viscous diffusion, viscous dissipation and pressure diffusion, and also having the characteristics of approaching their respective conventional high-Reynolds-number models far away from the wall is proposed.

TL;DR: In this paper, the Launder and Sharma low-Reynolds-number k ~ ϵ turbulence model is used for developing flow in a tube and the results show that the model is in agreement with a range of experimental heat transfer data and flow profile measurements for air, except for strongly buoyancy-influenced descending flow.

TL;DR: In this article, mixed convective heat transfer results for laminar, buoyancy-assisting, two-dimensional flow in a vertical duct with a backward-facing step are reported.

TL;DR: In this paper, experiments on pool boiling heat transfer in saturated R-113 at 1 atm pressure were conducted to investigate anomalies associated with the initiation of boiling using horizontal, 0.13 mm diameter chromel wires and a 0.51 mm diameter, platinum thin-film heater.

TL;DR: In this article, a numerical study is made of double-diffusive convection in a rectangular cavity with combined horizontal temperature and concentration gradients, where boundary conditions at the vertical side walls are imposed in such a way that the thermal and solutal buoyancy effects are counteracting, resulting in an opposing gradient flow configuration.

TL;DR: In this paper, a numerical analysis is carried out to investigate the effects of latent heat transfer, in association with the evaporation of a finite liquid film on the channel wall, on the natural convection heat and mass transfer.

TL;DR: In this article, the authors provided comprehensive numerical solutions to the full, time-dependent Navier-Stokes equations at large thermal (Rt) and solutal (Rs) Rayleigh numbers.

TL;DR: In this article, an interferometric technique was used to determine local heat transfer coefficients for surfaces with repeated ribs and steps, and the effects of parameters such as protuberance height-to-spacing ratio, conductivity of ribs, and angle of inclination were studied.

TL;DR: In this article, the boiling process in a tube bundle is divided into mechanisms due to liquid forced convection, sliding bubbles and nucleation, and a novel experimental analysis of heat transfer from a tube in a bundle indicates the predominance of the sliding bubble part.

TL;DR: In this article, an experiment was carried out on free convective and radiative heat transfer from dense pin-fin arrays with a vertical isothermal base plate, and the experimental formula for the average heat transfer coefficient was derived.

TL;DR: In this article, a new correlation of the velocity coefficient k is derived based on CHF data of various kinds of fluids, presenting a generalized method to predict CHF of sub-cooled flow boiling within the range of subcooling Tsat−TL⩾0 K, void fraction α < 0.7, and vapor/liquid density ratio ϱv/g9L ⪢ 0.01.

TL;DR: In this paper, a new turbulence model which is a hybrid of the k-e model and an algebraic Reynolds stress model (ASM) is developed, which takes from an ASM that part of the non-isotropic Reynolds stress which is due to buoyancy, and the remaining part from the k -e model.

TL;DR: In this article, the authors measured the local forced convective heat transfer characteristics of an array of two-dimensional discrete heat sources and found that protruding heat sources yield higher heat transfer than flush-mounted heat sources at the same channel Reynolds number.

TL;DR: In this article, heat transfer enhancement in mixed convection flow between parallel plates heated uniformly from below is investigated, and the onset of secondary flow is found to precede appreciable heat transfer enhancements.