Showing papers in "Letters in Heat and Mass Transfer in 1981"

TL;DR: In this paper, the effects of Gr (Grashof number), Gm (modified Grashof numbers) and permeability K of the porous medium on the velocity and rate of heat transfer are discussed when the surface is subjected to a constant suction velocity.

TL;DR: In this article, the importance of thermal dispersion on non-Darcian convective flow in a saturated porous medium is discussed and a new theoretical model taking into consideration thermal convective effects is proposed.

TL;DR: In this paper, the determination of shapefactors between two plane rectangular surfaces of arbitrary position and size with parallel boundaries is described for three different cases: the planes carrying the two surfaces are inclined at an arbitrary angle α or are perpendicular or parallel.

TL;DR: In this article, forced convection evaporation of binary mixtures of refrigerants 12 and 22 in a horizontal tube under uniform heat flux conditions is reported for pure R-22 and mixtures with about 25 and 45 per cent R -22 by mass.

TL;DR: In this article, an analysis of the thermal boundary layer in a gas subject to time dependent pressure variations has been made for the case in which the thermal conductivity is proportional to the temperature, and explicit expressions for the time dependent boundary layer profile, the displacement thickness and the heat transfer rate are presented.

TL;DR: In this article, the effects of a uniform transverse magnetic field on the free-convection flow of a viscous incompressible and electrically conductive fluid past an accelerated vertical infinite plate with variable suction or injection and heat flux are analyzed.

TL;DR: In this article, an exact method of analysis is presented for solving the low Peclet number thermal entry region problem for laminar flow inside a circular tube, including the effects of axial conduction in both the upstream and downstream directions.

TL;DR: In this article, thermal conductivity measurements of five non-Newtonian aqueous solutions (Polyethylene Oxide, Polyacrylamide, Carboxymethyl Cellulose, Carbopol-960 and Attagel-40) are in good agreement with the corresponding values for water up to concentrations of 10,000 wppm.

TL;DR: In this paper, preliminary experimental results for the investigation of non-Darcy effects in free convection in a porous medium are reported in comparison with experimental results, it is found that the Plumb and Huenefeld theory overestimates the heat transfer rate while underestimating the temperature distribution by a substantial amount.

TL;DR: In this paper, it was shown that straight inviscid jet columns possess the property of sinusoidal infinitesimal buckling and the buckling wavelength scales with the transversal dimension of the jet.

TL;DR: In this article, the theoretical and experimental study of heat conduction loss for a platinum wire used as a temperature sensor when the influence of Wollaston wire is taken into account.

TL;DR: In this article, the general problem of coupled heat and mass transfer in n component mixtures is formulated using a generalization of the Maxwell-Stefan equations and approximate and rigorous methods for obtaining the mass and energy fluxes are developed under the assumptions of steady one dimensional transfer.

TL;DR: In this article, an array of PCM cylinders subject to a transfer fluid crossflow was used to predict the thermal behavior of such an array, making use of a relation derived in a previous study, as well as certain assumptions on the behavior of a PCM body.

TL;DR: In this paper, a numerical study of the frequency response of electrochemical probes to fluctuations of wall shear stress or concentration is presented, by using double probes, to a flat response over a wide domain of frequency.

TL;DR: In this article, the influence of conduction between a wire used as a sensor of temperature and its prongs on measurements of temperature variances and spectra was investigated. But the experimental study of the influence on conduction was limited to static conditions (calibration) and dynamical conditions (measurements in turbulent temperature).

TL;DR: The dependence of heat transfer coefficient on temperature in the range investigated here is found to be weak as mentioned in this paper, and the results are interpreted to infer the dependence of Heat Transfer coefficient on gas velocity, bed temperature and particle diameter.

TL;DR: In this article, a film model for flooding and flow reversal has been explored for two cases of coupling (circulation) or decoupling (split) between the upflow and downflow.

TL;DR: In this article, the Stefan number St is described as the ratio of sensible to latent heat in a phase change process and it is shown that St does indeed approximate twice that ratio, and that the ratio is independent of time.

TL;DR: In this article, formal analytic solutions for three dimensional, transient heat conduction in an anisotropic solid of arbitrary shape subjected to general linear boundary conditions are presented for three dimensions.

TL;DR: In this article, the authors measured the heat transfer coefficient for a vertical smooth coaxial heat transfer tube in a cylindrical air fluidized bed as a function of fluidizing velocity, temperature and particle size.

TL;DR: In this paper, a solution of the coupled equations of steady state unidirectional diffusion in multicomponent mixtures in turbulent flow is obtained in explicit matrix from using the properties of the matrizant.

TL;DR: In this paper, the turbulent round free jet characteristics, including fluctuating velocities tangential and normal correlations, are predicted by means of a (K-ϵ)-model plus a simplified algebraic second-order closure scheme.

TL;DR: In this paper, the numerical solution of the heat transfer problem in a convergent channel with uniform and non-uniform wall temperatures under boundary-layer approximations has been presented.

TL;DR: In this paper, a trasient heat conduction in a cylinder of infinite length, an infinite flat plate, and a sphere are presented for a range of Biot numbers (1 100 to 1 1000 ) relevant to problems which involve cooling by natural convection.

TL;DR: In this paper, an experimental investigation of natural convection mass transfer within horizontal cylindrical annuli was performed using the electro-chemical technique, where physical properties of the solution and outer tube diameter were studied.

TL;DR: In this paper, high speed motion pictures of the vapor-liquid interface in film boiling have been obtained and all tests have been conducted at atmospheric pressure over a range of heat flux between 9000 and 37000 BTU/hr ft(2).

TL;DR: In this paper, steady-state mass transfer between a wall, or interface, and a turbulently flowing fluid phase is analyzed, and proper account is taken of the diffusional coupling between the species transfers.