Showing papers in "International Communications in Heat and Mass Transfer in 1992"

TL;DR: In this article, the effects of free convection and the presence of heat generation or absorption on the flow and heat transfer characteristics are considered, and the equations of conservation of mass, momentum, and energy are solved numerically by using a variable order, variable step size finite-difference method.

TL;DR: In this article, the stabilizing effects of surface tension associated with practically finite wave lengths must be considered, which explains the basic defficiency of all previous analyses which employed single stability criteria of infinite long waves.

TL;DR: In this paper, a family of empirical correlations are presented which relate soil thermal conductivity to saturation for five soil types, namely, gravel, sand, silt, clay and peat, in both the frozen and unfrozen states.

TL;DR: In this article, a numerical study of non-Darcy effects on the fully developed forced convection parallel plate channel flow partially filled with a porous medium is presented, where the Navier-Stokes equations govern the fluid motion in the fluid region, while the Darcy-Brinkman-Forchheimer model is assumed to hold within the porous media.

TL;DR: In this paper, the authors compared the mechanisms for the formation of the liquid-rich macrolayer on heater surfaces during nucleate boiling, including the Helmholtz instability analysis applied to vapor stems above active nucleation sites, liquid trapped by lateral coalescence of discrete bubbles that initally form during the mushroom bubble's waiting period and the limitation of liquid resupply after mushroom departure as a result of vapor flow from active sites.

TL;DR: A heat transfer analysis for determination of the temperature distributions during hydrocooling experiments of cylindrical products is presented in this article, where the results indicate that a very good agreement was found between the measurements and predictions.

TL;DR: In this paper, numerical solutions for fully developed laminar flow forced convection heat transfer of a power law non-Newtonian fluid in rectangular ducts are presented, and the Nusselt values, maximum wall temperatures, and minimum wall temperatures for the H2 thermal boundary condition for different combinations of heated and adiabatic walls are obtained.

TL;DR: In this paper, the thermal properties of potential phase change materials (PCMs) for district cooling systems were evaluated. But, the results for commercial (i.e., technical) grade substances were found to be considerably lower than for laboratory grade materials.

TL;DR: In this paper, the melting rates due to close contact heating of a block of phase change material have been analyzed in several internal and external configurations, and the scale analysis of close contact melting in a region of general shape has been shown that the melting rate in all configurations is anticipated.

TL;DR: In this article, the authors present reciprocity theorems applicable to heterogeneous bodies, which can then be easily specialized to the cases for which the properties in the large can be considered to be those of a homogeneous medium, enabling the definition of an effective property.

TL;DR: In this article, three types of cooling fins are analyzed: longitudinal, spine and annular; each of them has three possible shapes: constant thickness, triangular and parabolic, and the effect of the tip condition and fins with convective tips are compared to insulated tip fins.

TL;DR: In this article, the experimental results of flow pattern for vertical downward two-phase flow in capillary tubes are reported and flow pattern regime maps are presented and theoretically based transition criteria for the flow pattern are presented.

TL;DR: In this article, an analytical solution of transient temperature profile and heat flux variation for a semi-infinite body with a heat generation exponentially decaying with position is obtained, where the initial temperature condition is assumed to be constant while the surface boundary either transfers heat to ambient by convection, is kept at constant temperature, or insulated.

TL;DR: In this article, a modified boundary element technique was used to simulate the injection mold cooling process and the mold cavity surface temperature distribution and the temperature profile of the polymer melt and the corresponding transient heat flux on plastics-mold interface were computed in a decoupled manner.

TL;DR: In this article, the effects of suction or injection on steady free convection from a vertical cone with uniform surface heat flux condition, a difference-differential technique with an iterative method has been used to solve the non-similar boundary layer equations.

TL;DR: The surface tension of four kinds of aqueous polymer solutions was measured as a function of polymer concentration using a capillary tube surface tensiometer as mentioned in this paper, and the results were in good agreement with earlier measurements obtained with the maximum bubble pressure method.

TL;DR: In this article, the effect of thermal and mass buoyancy forces on fully developed laminar forced convection in a vertical channel has been studied analytically, and the authors derived expressions for the bulk temperature and concentration and criteria for the occurrence of flow reversal have been presented.

TL;DR: In this article, the effects of a permeable inner boundary on the maximum temperature and the convective flows were investigated numerically for a two-dimensional horizontal annulus containing a uniformly heat generating porous media.

TL;DR: In this article, a simple method for investigating heat conduction in materials of non-uniform thermal conductivity and irregular shapes is presented, where the material is tessellated into cells (squares in two-dimensions and cubes in threedimensions).

TL;DR: In this article, a modification to the model of Taitel and Dukler to include the effect of surface tension in transition between stratified and annular regimes is proposed.

TL;DR: In this paper, the effects of a permeable outer boundary on the maximum temperature and the convective flows were numerically investigated in a two-dimensional horizontal annulus containing a uniformly heat generating porous media.

TL;DR: In this paper, the effect of mixed convection and thermal radiation in laminar pipe flow is studied and an absorbing and emitting gas is considered and treated to be a gray medium.

TL;DR: In this article, an experiment was conducted on nucleate pool boiling of R113 on graphite-copper composite surface, and a computer program was developed to determine the temperature distribution inside a composite cylinder heated from the lower end with incipient boiling on the upper end, and the microstructure of the composite surface was examined by means of a scanning electronic microscope.

TL;DR: In this article, a new model was developed to describe the heat transfer mechanism in nucleate pool boiling on a microconfigured composite surface and both the microlayer and macrolayer thickness were determined from the model.

TL;DR: In this paper, the role of temperature-dependent viscosity in buoyancy-induced flows of liquids adjacent to a vertical and/or a horizontal surface embedded in a saturated porous medium is studied.

TL;DR: In this paper, a simplified dimensionless model is derived in order to study the development of a fire and the effect of parameter variations on the stationary states investigated, focusing on the occurrence of flashover jumps and the influence of ventilation on the models behaviour.

TL;DR: In this article, an isothermal flow model with a 1 12 scale factor of a China Steel Corporation (SCS) 55MWe tangentially fired boilers, which uses Australia Woodland (bituminous) coal as the fuel, cofiring with Blast Furnace Gas (BFG) caused a serious carbon burnout problem.

TL;DR: In this paper, an experimental investigation was carried out to determine the pressure drop and heat transfer characteristics for spirally fluted tubes in laminar, transitional and turbulent flow of air.

TL;DR: In this paper, a physical model of transient conduction in heterogeneous media is presented, where the thermal conductivity of the media is assumed to vary randomly and temperature distributions in the media are generated using both random variable and constant average thermal conductivities.

TL;DR: In this article, heat transfer and pressure drop measurements from an aerofoil in cross-flow, arranged in single, six-row aligned and staggered positions, have been reported in the Reynolds number range of 50,000 to 135,000.