Showing papers in "International Journal of Heat and Mass Transfer in 1969"

TL;DR: In this article, the Kolmogorov-Prandtl turbulence energy hypothesis is formulated in a way which is valid for the laminar sublayer as well as the fully turbulent region of a one-dimensional flow.

TL;DR: In this paper, the authors consider the resistance to the flow of heat between two thick solid bodies in contact in a vacuum and compare the performance of single idealized contacts with results of recent electrolytic analog tests to predict the conductance of multiple contacts.

TL;DR: In this paper, it is shown that a thin layer of liquid (the microlayer) forms beneath the vapour bubble, which can also be deduced from a simple theory for the hydrodynamics of the formation of the layer.

TL;DR: In this article, a theoretical technique to predict the thermal conductivity of heterogeneous solid mixtures has been developed, which does not require experimental data on the mean and standard deviations of the one dimensional porosity function describing the distribution of the discontinuous phase as is the case with Tsao's model.

TL;DR: In this article, a theory is presented to determine the rate of growth of a vapour bubble growing from a heated wall in a liquid which is near to saturation temperature, based on approximate assumptions derived from experiments in which thin liquid layers (microlayers) were observed to occur under such bubbles, and in which evaporation of the microlayers contributed significantly to the growth of the bubbles.

TL;DR: In this article, the results of a series of experiments conducted to clarify the space restriction effect on the saturated boiling heat-transfer phenomena are reported, and the main purpose of this study is to detect and prove the heat transfer characteristics of the coalesced bubble region.

TL;DR: In this article, experimental results from constant free-stream velocity boundary layers are reported for a variety of constant and slowly varying injection and suction wall conditions, and a description is given of the flow characteristics of these air experiments.

TL;DR: In this article, an optical technique is described which permits the simultaneous determination of detailed microlayer geometry and macroscopic bubble dynamics in nucleate boiling, and normal bubble growth pictures in profile are obtained.

TL;DR: In this paper, a model of spherically symmetric quiescent droplet undergoing quasi-steady vaporization near thermodynamic critical point is presented, where the model is extended to include a quiescence model.

TL;DR: In this article, the effects of interferograms of the near temperature field and the rising plume on convection flows induced by individual surfaces in a close spaced array are investigated for various arrangements of spacing and orientation.

TL;DR: In this article, the effect of surface thermal properties on dropwise condensation is considered, and the physical explanation for this effect is given by considering constriction phenomena in metalic surfaces caused by a non-uniform heat flux distribution over the condensing surfaces.

TL;DR: In this paper, the mathematical equations describing transient heat transfer between the fluid flowing through a fixed bed of packing are formulated for the situations where there is resistance to heat transfer within the solid phase and there is thermal conduction along the direction of fluid flow Numerical analysis is presented for a computer solution of these equations and a parametric investigation of the models is used to show that the values of certain dimensionless groups arising from the mathematical formulation may be used to define the range of conditions under which the alternative heat transfer mechanisms are important.

TL;DR: In this paper, the authors describe the instantaneous frozen layer thickness and temperature profile in solidified layer obtained by iteration technique using iteration technique and iterative technique, and show that the thickness of the frozen layer can be estimated by iteration.

TL;DR: Two dimensional natural convection boundary layer on finite isothermal horizontal plate, examining upward facing cold plate and downward facing hot plate as mentioned in this paper, examining upward and downward faces of cold and hot plate.

TL;DR: In this paper, an experimental study of splattering and bouncing of water, acetone, and alcohol droplets from a heated plate reveals that the heat transfer per drop exhibits a maximum at a temperature excess of approximately 300°F and that a satisfactory correlation for this maximum Q max \ gr L d 3 λ = 8·44(10 −4 )(ρ 2 L V 2 d \ gr VF σgg c ) 0·341.

TL;DR: In this paper, the process of evaporation and combustion of a liquid droplet in a still air is calculated numerically, treated as an unsteady diffusion-controlling phenomenon with the flame front model.

TL;DR: In this article, a wide range of velocity and density ratios were investigated for a given mass flux of foreign gas and the mainstream boundary layer thickness and slot lip geometry were varied in order to investigate the importance of these parameters.

TL;DR: In this article, extensive experimental data is presented for growth rates of vapor bubbles in water, ethanol, and isopropanol at small uniform superheats up to 4.9°C.

TL;DR: In this paper, the authors present a new and general method of calculating the total effectiveness and intermediate temperatures of assemblies of heat exchangers, which may consist of associations of any types of Heat Exchanger.

TL;DR: In this paper, the effects of the diameter and orientation of electrically heated wires on their critical heat flux, both in saturated pool boiling and in surface boiling, have been investigated.

TL;DR: In this article, the effect of thermal conductivity within heat storing material of the regenerator in a direction perpendicular to the direction of gas flow has been considered and the effect is discussed of the simplifying assumption that the problem can be regarded to be in two dimensions only.

TL;DR: In this article, an experimental investigation of the initial vapor bubble growth on a horizontal, heated wall during saturated pool boiling is reported, where the authors used high-speed framing photography for the observation of bubble growth rates.

TL;DR: In this article, an analysis of forced convection film condensation on a flat plate is performed for the case in which the free stream vapor flow is superheated and the solution method is applicable to free stream flows that are either binary mixtures of a condensable vapor and a noncondensable gas or pure condensable vapors.

TL;DR: Rough metal surfaces thermal constriction resistance for total heat flow through micro-contacts as discussed by the authors was shown to have similar properties to micro-contact microcontacts in the literature.

TL;DR: In this article, a thin film formed over a limited surface area by supplying liquid through a spray nozzle was studied experimentally in a thin-layer liquid boiling setup, and some new correlations have been obtained such as higher critical fluxes in comparison with pool boiling, a single transition point on the boiling curve, q vs. ΔT different behaviour of the dependence of α vs. q and other observations which are discussed in the work.

TL;DR: In this article, the Malkus-Veronis power integral technique was used to predict heat transfer rates in fluids contained in vertical right cylinders heated on a horizontal bottom and cooled on a vertical top end.

TL;DR: In this article, the application of the γ-absorption method to meaurement of vapour volumetric fraction during forced convection boiling in a small annular channel is discussed.