Showing papers in "International Journal of Heat and Mass Transfer in 1984"

TL;DR: In this paper, new flow-regime transition criteria for upward gas-liquid flow in vertical tubes have been developed considering the mechanisms of flowregime transitions, which can be compared to existing criteria and experimental data under steady-state and fully developed flow conditions by using relative velocity correlations.

TL;DR: In this article, a computational method was used to obtain solutions of the buoyancy-driven laminar and turbulent flow and heat transfer in a square cavity with differentially heated side walls.

TL;DR: In this article, an improved version of the generalized correlation is successfully developed, being accompanied with a very clear-cut structure as compared with the previous correlation, and careful experiments have been attempted with an identical test tube covering all the main characteristic regimes of CHF.

TL;DR: In this article, the authors investigated the effect of surface orientation on nucleate boiling heat transfer and proposed two mechanisms of the sensible heat transport by compulsory removal of the thermal layer by the rising bubble and the latent heat transfer by evaporation from thin liquid film underneath the bubble.

TL;DR: In this article, an analysis of the transient response of a packed bed thermal storage unit is presented in two spatial dimensions and considers the influence of axial and radial thermal dispersion for arbitrary time and radial variations in the inlet fluid temperature.

TL;DR: In this paper, analytical solutions are developed for the hyperbolic heat conduction equation describing the wave nature of thermal energy transport in a finite slab with insulated boundaries subjected to a volumetric energy source in the medium.

TL;DR: In this article, the Brinkman-Forchheimer-extended Darcy model is used as the momentum equation and the effect of porosity variation is taken into consideration.

TL;DR: In this paper, a force balance between pressure forces in a thin liquid layer between the bottom of the sinking solid bulk and the heated tubewall and the gravitational force of the solid bulk was determined by means of a photograph technique.

TL;DR: In this paper, heat transfer characteristics and flow behaviors have been made clear for an elliptic cylinder of axis ratio 1 : 3, where the testing fluid was air and the Reynolds number ranged from about 8000 to 79000.

TL;DR: In this article, the laminar combined convection heat transfer from an isothermal horizontal circular cylinder is studied for the two cases when the forced flow is directed either vertically upward (parallel flow) or vertically downward (contra flow).

TL;DR: In this paper, it was shown that the departure from the Darcy flow model is dictated by the dimensionless number G = (v/K)(bgββΔT) − 1 2, with G → 0 representing the high pore Reynolds number limit, and G → ∞ representing the normal flow limit.

TL;DR: In this article, the authors considered the problem of estimating the condensate film thickness in a horizontal tube with potential flow and showed that the upper part of the tube can be assumed to have no pressure gradient.

TL;DR: In this article, the role of natural convection on solid-liquid interface motion during melting and solidification of Lipowitz metal in a rectangular cavity was studied, and measurements of both temperature distributions and temperature fluctuations were used as a qualitative indication of the natural convective flow regimes and structures of melt during phase transformation.

TL;DR: In this article, a vertical boundary of a horizontal plate-like solid initially at the fusion temperature with adiabatic upper and lower surfaces was subjected to a step-wise temperature increase.

TL;DR: In this paper, a numerical study of the time-dependent, two-dimensional, laminar, convective flow that arises is carried out, where the hot fluid is withdrawn at the top and the cold fluid discharged at the bottom of the storage region to preserve the thermal stratification.

TL;DR: In this paper, two different degrees of corrugation-peak roundedness were used in addition to sharp (i.e. unrounded) corrugations peaks. But the results showed that the Nusselt number was relatively insensitive to whether the peaks were sharp or rounded.

TL;DR: In this article, an asymptotic solution of the Navier-Stokes and energy equations for the problem of free convection from a vertical finite plate is considered, and the effect of the leading edge has been analyzed with the aid of a deformed longitudinal coordinate.

TL;DR: In this paper, the heat transfer and fluid flow in a rectangular enclosure fitted with a vertical adiabatic partition is investigated experimentally, where the partition is oriented parallel to the two vertical isothermal walls, one of which is heated and the other cooled while all other surfaces of the enclosure are insulated.

TL;DR: In this article, the transient natural convection heat transfer problem between two horizontal isothermal cylinders is formed within the Boussinesq approximation and solved numerically through the vorticity-stream function approach.

TL;DR: In this paper, the boundary-layer flow over semi-infinite vertical and horizontal flat plates, heated to a constant temperature in a uniform free stream, is studied when the buoyancy forces either aid or oppose the development of the boundary layer.

TL;DR: In this paper, electropolished silver surfaces were investigated as promoters of dropwise condensation of steam at atmospheric pressure, and two surface plating solutions were used to promote condensation.

TL;DR: Etude experimentale du comportement et des caracteristiques de transfert de chaleur pendant la periode de contact d'une gouttelette d'eau pure de diametre compris entre 2,54 and 4 mm sur des surfaces lisses de cuivre, laiton, acier doux and acier inoxydable as mentioned in this paper.

TL;DR: In this paper, the natural convection motion and heat transfer rate in an inclined rectangular air layer, in which two opposing isothermal rigid-boundaries were kept at different temperatures, were investigated experimentally for various angles of inclination.

TL;DR: In this paper, an accurate and repeatable heat-transfer data have been obtained for filmwise condensation from pure vapours (steam and R113) and vapour-gas mixtures (steam-air, steam-hydrogen, R113-air and R 113 -hydrogen) flowing vertically downwards over a single horizontal tube.

TL;DR: In this article, mass transfer experiments were carried out in packed beds of spheres of low tube-to-particle diameter ratio (3 ε d t p ⩽ 12) to determine, by analogy, the fluid-phase contribution to the heat transfer effective radial Peclet number and the apparent wall Biot number.

TL;DR: In this paper, a theoretical study on steady natural convection inside a rectangular porous enclosure with uniform internal heat generation and cooling from the side walls is performed and the analytical predictions agree well with the numerical solutions based on the power-law difference representation of the full governing equations.

TL;DR: In this article, the thermal and dynamic structures of thermogravitational flows in a horizontal layer heated from the side and having two rigid boundaries were investigated, where the upper surface of the layer is free and the lower is rigid and adiabatic.

TL;DR: A brief description of the nature of flame radiation in gas-turbine combustors is given in this article, followed by a discussion on the methods and models available for estimating nonluminous and luminous emissivity.

TL;DR: Etude experimentale du transfert de chaleur a l'ebullition d'eau contenant 0,1 ou 0,5% de particules d'Al 2 O 3 de diametres 0,05-0,3 et 1 microns.

TL;DR: The Navier-Stokes equations for a two-dimensional liquid film which is drained down a vertical wall in laminar flow are formulated in terms of the Lagrangian velocities and solved by a finite-element method as mentioned in this paper.