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Showing papers in "International Journal of Heat and Mass Transfer in 1981"


Journal ArticleDOI
TL;DR: In this article, the effects of a solid boundary and the inertial forces on flow and heat transfer in porous media were analyzed, and a new concept of the momentum boundary layer central to the numerical routine was presented.

1,427 citations



Journal ArticleDOI
TL;DR: In this paper, a broad range of Performance Evaluation Criteria (PEC) applicable to single-phase flow in tubes is presented and detailed procedures are outlined to calculate the performance improvement and to select the optimal surface geometry.

802 citations


Journal ArticleDOI
TL;DR: An implicit scheme for one dimensional problems, based upon the above development, is described which can cope with any size phase change temperature range and the influence of internal heating, simultaneously.

486 citations


Journal ArticleDOI
TL;DR: In this paper, a nonlinear problem of thermal, mass and dynamic interaction between a vapour-gas bubble and a liquid is considered with account for temperature nonuniformity in the bubble and interdiffusion of the vapour gas mixture components.

177 citations


Journal ArticleDOI
TL;DR: In this article, a special solution procedure is developed for the one-dimensional case which replaces the heat conduction equation with an approximating hyperbolic equation, and an initial value problem for the damped wave equation is obtained.

169 citations



Journal ArticleDOI
TL;DR: In this article, an approach to pool film boiling on a horizontal surface on the basis of the Reynolds analogy is suggested, and the influence of vapour film thickness and vapour velocity on Taylor instability of the interface has been investigated.

140 citations


Journal ArticleDOI
TL;DR: In this paper, the lowest surface temperature possible for the existance of spray evaporative cooling is determined experimentally to be a linear function of the impinging spray mass flux, and the initiation of the "Leidenfrost state" provides the upper surface temperature bound for spray evaporation cooling.

137 citations


Journal ArticleDOI
TL;DR: In this article, an off-axis turbulent methane-air free jet was applied to optical tomography to determine the mean methane concentration throughout the mixing region, where absorption measurements were made on methane using the near resonance 3.39 μm line of a He-Ne laser.

135 citations


Journal ArticleDOI
TL;DR: In this paper, an extensive series of measurements of gas bubble diameters on detachment into flowing liquids has been performed and new expressions were proposed for the surface tension and drag forces experienced by a bubble attached to a solid surface.

Journal ArticleDOI
TL;DR: In this article, a finned vertical tube with either conduction in the solid or natural convection in the liquid was used to study freezing on a paraffin phase change medium with a fusion temperature of 36.4°C.

Journal ArticleDOI
TL;DR: In a slightly heated turbulent boundary layer, this paper showed that the extent of these regions, as a proportion of the boundary layer thickness, is approximately constant, independent of the momentum thickness Reynolds number when R m ⪞ 3100.

Journal ArticleDOI
TL;DR: In this article, an analysis of the flow and heat transfer in an interrupted-plate passage, which is an idealization of the offset-fin heat exchanger, is presented, where the plates are considered to be of finite thickness.

Journal ArticleDOI
TL;DR: In this paper, the authors analyzed the effect of condensation on the overall thermal performance of a porous slab exposed to two different humid environments on both sides, and found that both the condensation rate and the resulting increase in heat transfer depend on the Peclet number, the Lewis number, and the Biot number.

Journal ArticleDOI
TL;DR: In this article, an expression for stagnation heat transfer was derived for round, impinging jets on an electrically-heated surface in a small-scale setup characteristic of a typical turbine blade.


Journal ArticleDOI
TL;DR: Improved theoretical results for heat transfer through individual drops and for the mean distribution of drop sizes are used as a basis for assessing the validity of the basic assumption of dropwise condensation theory as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this article, critical heat flux and rate of droplet entrainment due to bubble bursting are made with boiling liquid films flowing downwards on the outside surface of a uniformly heated vertical tube.

Journal ArticleDOI
TL;DR: In this paper, the variable time step method introduced by Douglas and Gallie for solving a one-dimensional Stefan problem with constant heat flux at the fixed end is extended to cover a more general boundary condition.

Journal ArticleDOI
TL;DR: In this article, the boundary element method is used to solve axisymmetric transient heat conduction problems with time-dependent boundary conditions, and several results of numerical analyses are presented.

Journal ArticleDOI
TL;DR: In this paper, an interpolative scaling length is developed empirically, which, when introduced into the Wallis countercurrent flow equation, fits the air-water data for a variety of perforatedplate geometries, as well as full-length tube bundle data with saturated water and steam.

Journal ArticleDOI
TL;DR: In this article, the authors studied the relationship between overall heat transfer and the degrees of thermal stratification on both sides of the partition and showed that the theoretical Nusselt number calculation is in good agreement with experimental measurements.

Journal ArticleDOI
TL;DR: In this article, the authors developed and experimentally verified models for the instantaneous heat transfer in an engine exhaust port and made measurements of the instantaneous cylinder pressure and instantaneous exhaust gas temperature for a range of engine operating conditions.

Journal ArticleDOI
TL;DR: In this paper, the problem of steady film condensation outside a wedge or a cone embedded in a porous medium filled with a dry saturated vapor is investigated, where the condensate and the vapor are separated by a distinct boundary with no two-phase zone in between.

Journal ArticleDOI
TL;DR: In this paper, the exact transient temperature distribution of a semi-infinite cylinder with a uniform disk source centered at the end and uniformly heated is given by infinite series, tables, figures and approximate relations.

Journal ArticleDOI
TL;DR: In this paper, a simplified numerical model based on a quasi-linear, transient, thin fin equation was proposed to predict the fraction of melted phase change materials and the shape of the liquid-solid interface as a function of time with sufficient accuracy for engineering purposes.

Journal ArticleDOI
TL;DR: In this article, the starting transients and the friction factors and heat transfer rates at steady state for flow Reynolds numbers from 4 to 1000 were analyzed for an open, free convection loop.

Journal ArticleDOI
TL;DR: In this article, the authors present a series solution for the local surface temperature history for a semi-infinite body heated only over a circular region, where inside this region the heat flux is constant with time and position while outside the circular area the surface is insulated.

Journal ArticleDOI
TL;DR: In this article, the authors examined the buoyancy induced circulation occurring on both sides of a vertical impermeable partition separating two semi-infinite porous reservoirs maintained at different temperatures and found that the circulation is composed of two counterflowing boundary layers which interact thermally across the partition, transferring heat from the hot side to the cold side.