Showing papers in "International Journal of Heat and Mass Transfer in 1989"

TL;DR: In this article, the effects of variable thermophysical properties, non-unitary Lewis number in the gas film, and effect of the Stefan flow on heat and mass transfer between the droplet and the gas, and the effect of internal circulation and transient liquid heating are investigated.

TL;DR: Three limiting cases are identified which result in one-phase models of binary systems of binary alloy solidification and each of these models can be readily implemented in standard single phase flow numerical codes.

TL;DR: In this paper, mixture effects on horizontal flow boiling heat transfer with both azeotropic and non-azeotropic refrigerant mixtures were studied and an analysis was developed to predict a transition quality by using Hsu's onset of nucleate boiling theory.

TL;DR: In this paper, a correlation for the amount of entrained liquid in annular flow has been developed from a simple model and experimental data, which can provide accurate information on entrainment which have not been available previously.

TL;DR: In this paper, three-dimensional conservation equations for natural convection in a cubic enclosure heated from one side wall and cooled from an opposing wall are numerically solved under three different external magnetic fields either in the X-, Y- or Z-directions.

TL;DR: In this paper, a drying model is proposed which may be used to describe drying behavior of hygroscopic and non-hygroscopy materials, where the major internal moisture transfer mechanisms are considered to be capillary flow of free water in the wet region and movement of bound water and vapor transfer in the sorption region.

TL;DR: In this article, the relative importance of inertia and viscous forces on natural convection in porous media is examined via the Darcy-Brinkman-Forchheimer solutions for a differentially heated vertical cavity.

TL;DR: In this article, it was shown that the degree of thennodynamic imperfection (second law efficiency, η11) of the refrigeration and liquefaction plants that have been built does not depend on the load temperature Tl.

TL;DR: In this paper, the effects of the rib angle-of-attack on the distributions of the local heat transfer coefficient and on the friction factors in short rectangular channels of narrow aspect ratios with a pair of opposite rib-roughened walls are determined for Reynolds numbers from 10,000 to 60,000.

TL;DR: In this article, an experimental study on pressure drop during horizontal flow boiling of pure and mixed refrigerants of R22, R114, R12, and R152a is reported, where more than 600 pressure drop data are taken for annular flow under uniform heat flux at reduced pressures of 0.08-0.16 (200-800 kPa).

TL;DR: The existing control-volume finitedifference approach is modified so it can be applied to the numerical performance of Stefan problems, and the model is tested by applying it to a three-dimensional freezing problem and the numerical results are in agreement with those existing in the literature.

TL;DR: In this paper, an experimental study on horizontal flow boiling heat transfer for pure R22, R114 and their mixtures under uniform heat flux condition is reported, which indicates a full suppression of nucleate boiling for pure and mixed refrigerants beyond transition qualities and the majority of the data belongs to the convective evaporation region.

TL;DR: In this article, the authors investigated natural convection of air in square cavities with half-active and half-insulated vertical walls for Rayleigh numbers of 103-107 and found significant conduction effects even at a Rayleigh number of 105.

TL;DR: In this paper, the analysis on film boiling of impacting sprays is separated into two cases: a dilute spray (negligible heat transfer interaction among droplets) and a dense spray (significant interaction).

TL;DR: In this article, an analysis of the photophoretic force and velocity on aerosol particles in both the free molecular and slip-flow regimes is presented under the assumption of unpolarized incident radiation, absorption of radiation with the particle is formulated from Lorenz/Mie theory.

TL;DR: In this article, a diathermal partition on the cold wall of an air-filled, differentially heated, inclined square cavity was studied at Rayleigh numbers of 103-105.

TL;DR: In this paper, a numerical method to determine the thermal conductivity of a homogeneous material from measured temperature profiles is presented, where the problem is formulated as an optimization problem where the heat equation appears as a constraint.

TL;DR: In this article, two distinct CHF regimes were established based on flow visualization and experimental data, and experiments were performed to correlate and model CHF during subcooled flow boiling of dielectric fluorocarbon (FC-72) liquid on a smooth 12.7 × 12. 7 mm2 simulated electronic chip inside a vertical rectangular channel.

TL;DR: In this article, an experimental study of the convective flows engendered within the annular gap between concentric vertical cylinders is presented, where the inner cylinder is rotating and heated, while the outer cylinder is stationary and cooled.

TL;DR: In this paper, a radiation model was developed to evaluate the effect of fiber orientation on the radiative heat transfer through fibrous media between parallel planar diffuse boundaries, and the analysis revealed that the polar orientation of the fibers strongly affects both the backscatter factor and radiative energy transfer.

TL;DR: In this article, the authors analyzed buoyancy-driven fluid flow and heat transfer about a vertical flat plate embedded in a porous medium for two general cases: constant wall temperature and constant wall heat flux.

TL;DR: In this article, a nodal analysis based on Hottel's zonal method extended by the ray tracing method is carried out in order to treat the transient combined radiative-conductive heat transfer one-dimensional problem, in non-grey semi-transparent materials, more especially glasses, submitted to several thermal and radiative boundary conditions.

TL;DR: In this article, the authors considered increasing the heat dissipation of annular fin at a denned magnitude of mass, and four different cross-section shapes were examined, including constant thickness, constant area for heat flow, triangular and parabolic fin shapes.

TL;DR: In this paper, the effects of tube rotation on the velocity and temperature distribution, on the friction coefficient and on the heat transfer to a fluid flowing inside a tube are examined experimentally and by analysis.

TL;DR: In this article, the radiative properties of flyash polydispersions are calculated, allowing for realistic wavelength-dependent optical constants, including absorption, scattering, and extinction efficiencies, along with the spectral scattering asymmetry parameter.

TL;DR: In this paper, heat transfer data have been obtained for saturated flow boiling of water at 160-600 kPa in 9.6 and 14.4 mm bore vertical tubes under conditions dominated by convection or by nucleate boiling.

TL;DR: In this paper, the heat transfer characteristics of two coaxial cylinders, one of which is rotating, are investigated experimentally in the range of Taylor numbers (Ta)m from 103 to 2 × 107 with the axial Reynolds numbers Re from 50 to 1000.

TL;DR: In this paper, the effect of inclination on the steady natural convection local heat transfer characteristics in an air-filled differentially heated enclosure with cross-sectional aspect ratio was studied experimentally and numerically.

TL;DR: In this article, a model is formulated to describe the drying process of a consolidated finite slab of wet porous material by forced convection of hot, dry air past the exposed surface of a slab.