Showing papers in "International Journal of Heat and Mass Transfer in 1993"

TL;DR: In this paper, four turbulence models are applied to the numerical prediction of the turbulent impinging jets discharged from a circular pipe measured by Cooper el al. They comprise one k-e eddy viscosity model and three second-moment closures.

TL;DR: In this paper, the authors made extensive parametric studies of flow and heat transfer of a viscous fluid contained in a square cavity, where flow is generated by the top horizontal boundary wall, which slides in its own plane at constant speed.

TL;DR: In this article, an extensive set of measurements of a turbulent jet impinging orthogonally onto a large plane surface has been reported, with particular attention focused on two and six diameters.

TL;DR: In this paper, a forced convection boiling facility has been fabricated in which vapor bubble departure can be investigated, and a detailed analysis of various forces acting on the bubble is presented and is used to predict the mean departure diameter.

TL;DR: In this paper, the authors investigated the single-phase forced-flow convection and boiling characteristics of subcooled liquid flowing through microchannels with a cross-section of 0.6 × 0.7 mm, machined on the stainless steel plate 2 mm thick.

TL;DR: In this article, an improved model was proposed for the prediction of departure and lift-off diameters in saturated forced convection boiling, which utilizes a force balance similar to that proposed by Klausner et al.

TL;DR: In this article, an experimental investigation is described that characterizes heat transfer between a heated air stream and ceramic foam, and an apparatus is designed to determine the volumetric heat transfer coefficient between the foam and a stream of air using a single blow transient technique.

TL;DR: In this paper, a model for predicting the transient behavior of a shell-and-tube storage unit with the PCM on the shell side and the HTF circulating inside the tubes is presented.

TL;DR: In this paper, a general analytical approach to the thermal conductivity of porous media is developed which leads to theoretically sound expressions having a wide range of applicability and easily fitted to available empirical data.

TL;DR: In this paper, the liquid phase turbulent structure of an air water, bubbly upflow in a circular pipe has been investigated experimentally using both one-and two-dimensional hot-film anemometer probes.

TL;DR: In this article, a model for two-phase transport in capillary porous media is presented, in which the two phases are viewed as constituents of a binary mixture, and conservation equations are derived from the classical separate flow model without invoking additional assumptions.

TL;DR: In this article, Liu et al. presented measurements of the radial profiles of void fraction, bubble velocity and bubble size, using a miniature dual-sensor resistivity probe, under the same conditions.

TL;DR: In this paper, the authors performed a numerical and experimental analysis to investigate the heat transfer and fluid flow behavior in a rectangular channel flow with streamwise-periodic ribs mounted on one of the principal walls.

TL;DR: In this article, the authors used real-time holographic interferometry to measure local and average heat transfer and friction in a channel with various-shaped ridges mounted on two opposite walls.

TL;DR: In this article, it is shown numerically that the buoyancy induced circulation resonates to a certain (single) frequency of the pulsating heat input, characterized by maximum fluctuations in the total heat transfer rate through the vertical midplane of the cavity.

TL;DR: In this article, the spatial distribution of the temperature, ice-phase volume fraction (related to frost density), and rate of phase change within the frost layer are predicted using a local volume averaging technique.

TL;DR: In this paper, the authors identify the trigger mechanism for critical heat flux (CHF) in flow boiling and show that discrete bubbles which form following the onset of nucleation coalesce into a wavy vapor layer at fluxes well below CHF.

TL;DR: In this article, a superadiabatic combustion with reciprocating flow in a porous medium has been investigated through a numerical calculation, and the results revealed that the flame temperature in the porous medium is 13 times higher than the theoretical one of the ordinary flame in free space.

TL;DR: In this article, the authors investigated the high temperature convective drying process for two drying fluids: moist air and superheated steam, and for two materials: light concrete and softwood.

TL;DR: In this paper, a high-accuracy bench mark solution for the natural convection flow around a horizontal circular cylinder with uniform surface temperature is presented for small Rayleigh numbers (e.g. Ra = 103 and 104).

TL;DR: In this paper, an unsteady vaporization of a liquid oxygen droplet in gaseous hydrogen at moderate and high pressures is considered. But the details of the diffusion layer of dissolved hydrogen do not significantly affect the results.

TL;DR: In this paper, a model porous medium made of two-dimensional periodic arrange-ments of cylinders is considered and the boundary effects are modeled by using interfacial slip or no-slip temperature boundary conditions.

TL;DR: In this paper, the authors investigated flow structure, heat transfer, and drag by longitudinal vortices generated by double rows of delta winglets in transition channel flow for the reduction of the gas side heat transfer resistance of compact heat exchangers.

TL;DR: In this article, a theoretical CHF model is presented which is based upon the flow visualization of the wavy liquid-vapor interface near the heated surface as reported in Part I of this study.

TL;DR: In this article, the Nusselt number is calculated for both laminar and turbulent flows in a differentially heated, inclined square cavity. But the analysis was performed for the high Rayleigh numbers of 106 and 1010.

TL;DR: In this paper, the authors used nonlinear and standard k-ɛ turbulence models to predict the Reynolds stresses in the core flow region immediately above the ribs and the local Nusselt numbers were underpredicted.

TL;DR: In this paper, a new set of equations describing the growth and evaporation of stationary liquid droplets in a mixture of pure vapour and inert gas is presented in a simple algebraic form and is suitable for practical calculations of droplet growth at any Knudsen number and at any concentration of inert gas.

TL;DR: In this article, the critical heat flux (CHF) in subcooled flow boiling in short tubes was investigated and the effects due to variation of thermal hydraulic parameters (velocity, subcooling, pressure) on the heat transfer were presented together with a comparison of the experimental data with existing correlations and theoretical models.

TL;DR: In this paper, the authors studied the steady and steady convection in a fluid-saturated, vertical and homogeneous porous enclosure, and compared the fully numerical and analytical solutions.