Showing papers in "International Journal of Heat and Mass Transfer in 1983"

TL;DR: In this article, the critical heat flux (CHF) was introduced for columnar vapor stems distributed in a liquid layer wetting a heated surface, and a new hydrodynamic model was developed for pool boiling and forced convection boiling.

TL;DR: In this article, a constitutive relation for active nucleation site density is developed in pool boiling and extended to forced convective nucleate boiling, which is in relatively good agreement with direct measurements available in the literature.

TL;DR: In this article, a theoretically based prediction of CHF has been developed for high velocity flow in tubes, and good agreement was obtained between predictions and experimental data for water flowing in uniformly and nonuniformly heated tubes.

TL;DR: In this article, a theoretical analysis of the combined heat and mass transfer process taking place in the absorption of a gas or vapor into a laminar liquid film is presented, where the energy and diffusion equations are solved simultaneously to give the temperature and concentration variations at the liquid-gas interface and at the wall.

TL;DR: In this paper, an experimental study was made of critical heat flux in a closed two-phase thermosyphon and the effects of inside diameter, heated length, working liquid, fill charge and inside temperature on the critical heat flow were investigated.

TL;DR: In this article, the authors studied the process of energy separation in a vortex tube with air as a working medium and showed that the Gortler vortex produced by the tangential velocity on the inside wall of the vortex tube is a major driving force for the energy separation.

TL;DR: In this article, the macroscopic behavior of periodic composites is analyzed using the homogenization method, which can lead to different descriptions: single classical PDEs, single integral PDE with memory effect, systems of partial differential equations, etc.

TL;DR: In this article, a theoretical analysis was made of the different phenomena encountered and the assumptions involved in the calculation of the heat transfer rate to a single sphere under plasma conditions, and it was shown that if the integral mean thermal conductivity of the plasma is used in the evaluation of heat transfer coefficient, the Nusselt number for the conduction heat transfer between the plasma and the particle is equal to 2.0.

TL;DR: In this paper, the efficiency of a radiative cooling panel is defined for horizontal surfaces with infrared-transparent covers, and plots of efficiency versus a dimensionless temperature difference are shown to be insensitive to variations in air temperature, wind speed and sky radiance.

TL;DR: In this article, the evaporation of water into a laminar stream of air, humid air, and superheated steam was investigated using the one-third rule.

TL;DR: In this article, a 25 mm I.D. copper tube, tightly fitted with helical-wire-coil inserts of varying pitch (p), helix angle (x), and wire diameter (e), was used for heat transfer.

TL;DR: In this paper, an experimental study on the heat transfer performance of an inclined two-phase closed thermosyphon is described, where water and ethanol have been used as the working fluids.

TL;DR: In this article, the authors investigate the heat transfer and fluid flow characteristics of arrays of heat-generating, block-like modules affixed to one wall of a parallel-plate channel and cooled by forced convection airflow.

TL;DR: In this article, an investigation of heat transfer from round jets, impinging normally on three instrumented flat plates, for various nozzle-to-target plate distances, with Reynolds numbers ranging from 14 000 to 67 000, and nozzle diameters from 3.18 to 12.7 mm, has been carried out.

TL;DR: In this paper, the authors studied the pool boiling heat transfer in a confined space for vertical narrow annuli with closed bottoms and identified three boiling regimes through visual observation: the isolated deformed bubble regime, the coalesced deformed bubbles regime and the boiling regime at high heat flux.

TL;DR: In this paper, the problem of laminar mixed convection from a horizontal isothermal cylinder is considered and the free stream direction is assumed to be horizontal and perpendicular to the cylinder axis.

TL;DR: In this paper, an analytical solution of one transient heat conduction problem in one-dimensional multilayered slabs, cylinders and spheres is presented, which implements a safe algorithm for the automatic computation of the eigenvalues and eigenfunctions of the resulting Sturm-Liouville type system.

TL;DR: In this paper, the effects of varying the spacing between the corrugated walls and of different fluid flow inlet conditions were determined experimentally for water flowing in a corrugation-wall duct.

TL;DR: In this article, a new method for predicting the variation of nucleate pool boiling heat transfer coefficients with composition for binary liquid mixtures is presented, where the rise in the local boiling point of the liquid adjacent to the heated surface caused by preferential evaporation of the volatile component has a limit at the peak nucleate heat flux.

TL;DR: In this article, Fourier transforms are used to obtain expressions for the heat flux from a surface region at a given temperature into a 2 or 3 dim semi-infinite solid, with all quantities assumed to be periodic in time.

TL;DR: In this article, an experimental and analytical study of the phenomenon of heat transfer by natural convection in a rectangular enclosure fitted with an incomplete internal partition is presented. But the authors do not consider the effect of the aperture ratio h/H on both the heat transfer rate and flow pattern.

TL;DR: In this article, an analytical solution and a numerical study of natural convection in a rectangular porous layer heated and cooled with uniform heat flux along the vertical side walls was presented. But it was not shown analytically that in the boundary layer regime the vertical boundary layer thickness is constant and the core region is motionless.

TL;DR: In this article, a more general melting and solidification model is proposed to account for an interesting phenomenon, namely, the existence of a two-phase zone in which partial phase change can occur.

TL;DR: In this paper, an analysis of solute redistribution in binary aqueous salt solutions during unidirectional freezing with a planar solid-liquid interface is presented, and the results agree well with amathematical model describing pure mass diffusion at constant ice front velocity.

TL;DR: In this article, the response of a two-dimensional, multi-layer composite conducting slab, to a sudden change in the temperature of the surrounding fluid, has been analyzed and the solution is of the form of a coupled infinite series in the two space dimensions with an exponential time dependency.

TL;DR: Bubble dynamics for saturated nucleate boiling of water on an electrically heated platinum wire at atmospheric pressure have been photographed using a high-speed movie camera as mentioned in this paper, and the average number density of active nucleation sites has been found to increase linearly with the boiling heat flux.

TL;DR: In this paper, an analytical solution for the fluid flow and heat transfer in the entry region of a heated vertical channel is presented, and the conditions of constant wall temperature and constant wall heat flux are studied.

TL;DR: In this article, it was shown that the flow is confined to a thin layer about the forward hemisphere when the Peclet number is much greater than a known function of the Stefan number.