Showing papers in "International Journal of Heat and Mass Transfer in 1972"

TL;DR: In this article, a general, numerical, marching procedure is presented for the calculation of the transport processes in three-dimensional flows characterised by the presence of one coordinate in which physical influences are exerted in only one direction.

TL;DR: In this article, the local turbulent viscosity is determined from the solution of transport equations for the turbulence kinetic energy and the energy dissipation rate, and the predicted hydrodynamic and heat-transfer development of the boundary layers is in close agreement with the measured behaviour.

TL;DR: In this article, a comprehensive set of data was obtained for pressures from 226 to 294 bar, bulk temperatures from 230 to 540°C, heat fluxes from 116 to 930 kW/m 2 and mass velocities from 310 to 1830 kg/m2s.

TL;DR: In this article, an experimental study is described concerning natural-convection heat transfer from a plate with arbitrary inclination, and the results of heat transfer coefficients are represented in the relation of average Nu number vs. Ra number.

TL;DR: In this paper, the transport processes occurring in an evaporating two-dimensional meniscus and adsorbed thin film formed on a superheated flat glass plate (0.272°C superheat) immersed in a pool of saturated carbon tetrachloride are modeled and analyzed.

TL;DR: In this paper, the performance advantage of roughened tubes in heat exchanger design, relative to smooth tubes of equal diameter, is defined and the graphical results of example solutions are presented for the repeated-rib roughness.

TL;DR: In this paper, a numerical and experimental investigation of the developing laminar free convection heat transfer in vertical parallel plate channels with asymmetric heating is presented, where the Nusselt number characterizing the total heat transfer to the fluid is found to be related to the Rayleigh number very nearly by a universal curve for all ratios of wall temperature differences.

TL;DR: In this article, the Nusselt number was used for the analysis of turbulent heat and mass transfer in pipes, channels, and boundary layers, where the dimensionless coefficients of the universal logarithmic equations for the velocity and temperature profiles were derived.

TL;DR: In this article, the authors define mean speed of a molecule as function defined by equation (8): spatial increment and mean free path as a modified Bessel Function of the order of the mean speed.

TL;DR: In this article, a point successive-overrelaxation method was used to solve the thermal energy equation in curved tubes of circular cross section, where the curvature ratio was considered as an additional parameter.

TL;DR: In this paper, mass transfer rates between solid nickel surfaces and the ferro-ferri-cyanide electrolyte flowing in a 1 in.square duct have been measured for smooth and six similar rough surfaces, the latter having V-shaped grooves of 2-14 mil depth normal to the flow direction.

TL;DR: In this paper, the authors proposed a non-linear coupled hyperbolic simultaneous partial differential equations (SDPE) model for regenerative heat and mass exchanger, where heat and one or more adsorbates are transferred cyclically from one fluid stream to a porous matrix and then from the porous matrix to the other fluid streams.

TL;DR: In this article, a numerical simulation of dropwise condensation heat transfer was performed with an active site density as high as 109 sites/cm2, and heat transfer to the drop was determined by considering the effects of curvature of the drop surface, interfacial mass transfer between liquid and vapor phases, and conduction through the drop.

TL;DR: In this article, a finite difference solution of the equations describing transient natural convection in porous media is presented, and the linearized equations are solved to provide an estimate of the number of possible convective modes as a function of the Rayleigh number.

TL;DR: In this article, two-phase boundary layer equations of filmwise condensation on a horizontal cylinder are solved with an approximate method due to Jacobs, and numerical results for average coefficients of heat transfer are expressed as; Nu=χ 1+ 0·276 χ 4 FrH 1 4 Re 1 2 especially for large vapour velocity, namely for gD U ∞ 2 H ⪡ χ4 0·275 Nu =χ Re 12 where χ=0·9 1+ 1 RH 1 3

TL;DR: In this article, a summarization of five years work on heat transfer to the transpired turbulent boundary layer with transpiration is presented, experimental data are presented and discussed, and theoretical models for solution of the momentum equation under these conditions are presented.

TL;DR: In this paper, a numerical study of the transient laminar two-dimentional motion of a fluid between two heated vertical plates, the motion being generated by a temperature gradient perpendicular to the direction of the body force, is described.

TL;DR: In this article, the heat transfer properties of a vertical array of heated cylinders are obtained in steady state natural convection, showing that the surface temperature increases with elevation in the array for closely spaced arrays, but decreases with elevation when the spacing is sufficiently large.

TL;DR: In this paper, the initiation of natural convection in a fluid confined above and below by rigid perfectly conducting surfaces and laterally by rigid, perfectly insulating vertical walls that form a rectangular shape is examined.

TL;DR: In this paper, a theory for droplet evaporation has been developed which accounts for the transient character of the phenomena, including the effect of the motion of the droplet boundary thus relaxing the quasistationary approximation.

TL;DR: In this article, an experimental study on the heat transfer performance of a two-phase closed thermosyphon together with a simple theoretical analysis for its maximum heat transfer capacity has been made.

TL;DR: The importance of an accurate knowledge of thermal accommodation coefficient at larger values of Kn is discussed in this article, where hot wires have been calibrated in the regime 0 400, 0.02 < Re < 20 and with property values taken for the mean gas temperature.

TL;DR: In this paper, the results of measurements of the pressure drop over a range of Reynolds numbers Re = 6 × 102 − 2 × 105 in 25 test sections are communicated and compared with our results.

TL;DR: In this paper, an analysis of viscous dissipative heat on the two-dimensional unsteady free convective flow past an infinite, vertical, porous plate is carried out when the plate temperature oscillates in time and there is constant suction at the plate.

TL;DR: In this article, a modified interpretation of the boiling curve is used to explain the conduction of heat along the heating surface, for which a critical size is found beyond which dry areas keep growing.

TL;DR: In this article, the diffusion equation for the temperature distribution in each of k sections of a composite with internal heat generation and either heating, cooling or perfect thermal contact at the k − 1 interfaces is solved.

TL;DR: In this article, the effects of uniform blowing and suction on the free convection boundary layer on a vertical plate are considered, and a numerical solution of the full boundary layer equations is obtained in both cases.

TL;DR: In this article, the authors deal with natural convection heat transfer from a non-isothermal vertical flat plate immersed in a temperature stratified environment and show that approximations based on the local temperature difference can introduce large errors into the prediction of surface heat transfer rates.

TL;DR: In this article, a two-dimensional laminar jet issuing from a nozzle of half width which terminates at height above a flat plate normal to the jet is analyzed theoretically, and the available potential flow solution obtained by conformal mapping is used for the distribution of main-stream velocity over the flat plate.