Showing papers in "International Communications in Heat and Mass Transfer in 1990"

TL;DR: In this paper, a hybrid numerical-analytical procedure is described for the accurate and reliable solution of nonlinear diffusion problems due to potential dependent equation coefficients, and formal solutions provided in terms of the related transformed potentials, obtained from the numerical solution of a denumerable system of coupled nonlinear ordinary differential equations.

TL;DR: In this article, a boundary-layer analysis of coupled heat and mass transfer from a line source in saturated porous medium is reported, where boundary layer equations are shown to have solutions of similarity form for power-law variation of center-line temperature and concentration.

TL;DR: In this article, a subcooled void fraction experimental data was presented for upward and downward flow in an annulus for a velocity range of 0.07 to 0.46 m/s, and pressure of 155 kPa.

TL;DR: In this article, a distinction is made between microgravity conditions, where stratification is completely avoided, and finitely reduced gravity systems, which may still demonstrate stratified configuration, and the possibility of extracting some understanding on two-phase flow characteristics in space from "equivalent systems" operating under earth gravity.

TL;DR: In this article, an analytical study of buoyancy induced heat and mass transfer from a slender body of revolution embedded in a saturated porous medium has been reported for two important cases: (1) a paraboloid with constant temperature and concentration, and (2) a cylinder with linear temperature and distribution.

TL;DR: In this paper, the thermal characteristics of a single fin with all possible types of heat transfer are analyzed and the temperature distribution, tip temperature, and fin efficiency are given in implicit forms and solved by iterative procedures.

TL;DR: In this paper, a number of correlations for predicting the turbulent friction factor of purely viscous non-Newtonian fluids flowing in circular and non-circular geometries are presented.

TL;DR: In this paper, the mathematical model for convective drying of a consolidated slab of wet porous material developed by Ilic and Turner [1] is reconsidered and a single system of coupled nonlinear partial differential equations is solved numerically using finite difference techniques and results presented for the drying of wet brick.

TL;DR: In this paper, the effects of pre-boiling history on a regularly microconfigured surface in FC-72 are reported, and the wall-superheat at boiling initiation and the preceeding temperature overshoot are found to be independent of immersion time once the surface is degassed.

TL;DR: Experiments using naphthalene sublimation technique were performed to investigate the heat transfer coefficients and friction factors for corrugated-fin and tube heat exchangers with different fin-spacing.

TL;DR: In this article, the thermal conductivity and diffusivity of soil has been experimentally measured using the line heat source transient method using representative samples of different textures were collected and analyzed from different localities and depths.

TL;DR: In this paper, two-phase two-component jets of nitrogen gas and water droplets were impinged upon simulated micro-chips with high velocity under atmospheric pressure resulting in a super performance of thermal dissipation.

TL;DR: In this paper, a semi-empirical average heat transfer correlation applicable for both laminar and turbulent film-wise condensations has been presented, and the functional form of the present correlation is based on the representative existing correlations for L1 and turbulent L2 flows, whereas the numerical coefficients have been determined by the least squares method using experimental data obtained from the open literature.

TL;DR: In this paper, a numerical study was performed to analyze the natural convection fluid flow and heat transfer in a vertical annular enclosure that is partially filled with a vertically annular layer of a porous medium, and the results obtained in this study are directly applicable to the analysis and design of insulation systems, such as storage tanks and vertical pipes.

TL;DR: The existence of internal circulation in fluid droplets has been demonstrated by a number of investigators as mentioned in this paper, and it is noted that the strength of the internal vortex is not only a highly useful parameter in the modelling of transport to moving drops but is also necessary in the actual evaluation of the extent of transport.

TL;DR: In this paper, the effect of surfactant additive on boiling is attributed to the departure from equilibrium surface tension which is produced by extension of the vapor-liquid interface during growth and coalescence of vapor bubbles in the vicinity of boiling surface.

TL;DR: In this article, a study on the accuracy of thermocouple temperature measurements in a cylindrical combustor is presented, where a conservative procedure to compute maximum radiation errors is described.

TL;DR: In this article, the quasi-steady evaporation of an n-heptane droplet moving in the intermediate Reynolds number regime (Re = O(100)) was examined.

TL;DR: In this article, a boundary-layer analysis of natural convection resulting from a point heat source in saturated porous medium is re-examined and conditions for which the boundary layer approximation is valid are carefully examined.

TL;DR: In this paper, a method is proposed to calculate the time-dependent heat flux arising from natural convection during solidification of a liquid medium, which is incorporated in a solidification model which is then solved numerically using a time-stepping procedure.

TL;DR: In this article, a standard nomenclature for definition of the six different forms of the driving potential and the mass transfer coefficient was proposed, and the Lewis number was defined as the ratio Sc/Pr.

TL;DR: In this paper, transient mass transfer from an isothermal, vertical flat plate embedded in a fluid-saturated porous medium is investigated, and the results show that the local Sherwood number decreases with time and monotonically approaches its steady-state value.

TL;DR: In this article, the authors developed analytical expressions to describe the transient response of a straight fin when changes occur in the temperature of the surrounding fluid and showed that the rate of heat removal is not enhanced by subjecting a fin to a periodically changing fluid temperature as opposed to a steady average temperature.

TL;DR: In this article, smoke flow pattern photographs show that aiding flow has a weaker natural component than cross flow, and that there are various patterns during counter flow to form a heat transfer minimum and maximum.

TL;DR: In this paper, the absorption of CO2 laser beam in AISI 4340 steel under conditions of laser welding was investigated and the influence of the power density, the type of shielding gas, the shielding gas flow rate and the initial temperature of workpiece on absorption of laser beam was considered.

TL;DR: In this article, the authors present a theoretical analysis of forced-convection heat transfer over a flat surface imbedded in a saturated porous medium, considering that the viscosity of the fluid varies with temperature.

TL;DR: In this paper, an exact steady state and transient solution for the temperature distribution in a semi-infinite body with a Gaussian distribution heat source at the body surface is developed and presented.

TL;DR: In this paper, the authors measured the free convection mass transfer at horizontal cylinders with active ends by the electrochemical technique and found that the data were correlated for 2.3 × 108 < SC.Gr < 1.7 × 1011.

TL;DR: In this article, the effect of inclination on the bouyancy-induced flows in a truncated circular sector of porous medium was investigated. Butler et al. showed that the effects of inclined angles on the Bouyancy induced flows in such a geometry are negligible, and the relationship between Nusselt numbers, Rayleigh numbers and inclined angles was analyzed.

TL;DR: In this article, a simple analysis of the steady laminar forced convection film boiling flow over a horizontal flat plate is presented, based on a novel analogy drawn between the mobile liquid-vapor interface in forced convective film boiling and a moving surface in a flowing single-phase fluid.