Showing papers in "International Journal of Heat and Mass Transfer in 1998"

TL;DR: In this paper, an analog between convection and conduction with heat sources is made to have a further understanding of the mechanism of convective heat transfer, and three ways to raise the strength of heat sources/convection terms, and consequently to enhance the heat transfer are presented.

TL;DR: In this paper, an experiment was carried out to investigate the characteristics of the evaporation heat transfer and pressure drop for refrigerant R-134a flowing in a horizontal small circular pipe having an inside diameter of 2.0 mm.

TL;DR: In this article, a generalized correlation for the Nusselt number for turbulent, single-phase, forced convection in circular microchannels with diameters of 0.76 and 1.09 mm has been investigated.

TL;DR: In this paper, the authors developed an interfacial area equation with the source and sink terms being properly modeled for bubble coalescence, the random collisions between bubbles due to turbulence, and the wake entrainment process due to the relative motions of the bubbles.

TL;DR: In this paper, the effects of the electric double layer near the solid-liquid interface and the flow induced electrokinetic field on the pressure-driven flow and heat transfer through a rectangular microchannel are analyzed.

TL;DR: In this paper, a complete numerical solution of the Navier-Stokes and energy equations, based on a modified SOLA-VOF method, was used to model droplet deformation and solidification and heat transfer in the substrate.

TL;DR: In this paper, the problem of cooling a heated plate by an axisymmetric isothermal fully developed turbulent jet has been studied numerically, and the normal-velocity relaxation turbulence model (V2F) was used to predict local heat transfer coefficient.

TL;DR: In this article, a visual study of vapor bubble growth and departure in vertical upflow and downflow forced convection boiling is presented, where high-speed digital images of flow boiling phenomena were obtained, which were used to measure bubble growth, departure diameters, and lift-off diameters.

TL;DR: In this article, a summary of results of numerical investigations of the two-dimensional flow around a heated circular cylinder located in a laminar crossflow is presented, which yields information on Nu and C D variation with Reynolds number.

TL;DR: In this paper, the generalized momentum equation was used to simulate the temporal energy transport for incompressible flows through a packed bed and the governing equations were formulated according to the volume averaging method.

TL;DR: In this article, the authors provide a unique view into the physics behind the heat pipe operation, which was considered a thermal network of various components, by first-order, linear, ordinary differential equations.

TL;DR: In this article, a multi-dimensional, fuel film model is proposed to simulate thin fuel film flow on solid surfaces of arbitrary configuration, which is achieved by solving the continuity, momentum, and energy equations for the two-dimensional film that flows over a three-dimensional surface.

TL;DR: In this article, the thermodynamic aspects of phase transformations of liquids in microchannels were analyzed to further understand the boiling characteristics and to determine the conditions under which a portion of such liquids is likely to undergo phase change.

TL;DR: In this paper, the Brinkman number is proposed as a parameter for correlating the convective heat transfer parameters in microchannels and its incorporation is also supported by an energy balance across the microchannel.

TL;DR: In this article, the performance of swirling and multi-channel impinging jets with that of a conventional impinging jet (CIJ), having the same diameter at the same conditions, was investigated and compared.

TL;DR: In this paper, combined free and forced convection flow in a parallel-plate vertical channel is analyzed in the fully developed region by taking into account the effect of viscous dissipation.

TL;DR: In this paper, the flow field of an axisymmetric, confined and submerged turbulent jet impinging normally on a flat plate was studied experimentally using laser-Doppler velocimetry.

TL;DR: In this article, a model using the population balance concept is developed to predict the drop size distribution for small drops that grow by direct condensation, and the resistances to heat transfer due to the drop (conduction through the drop, vapor-liquid interfacial resistance, drop curvature) and due to promoter layer and the sweeping effect of falling drops are incorporated into the model and are also included in calculating the heat transfer rate through a single drop.

TL;DR: In this paper, the authors investigated the local heat transfer and pressure drop on the shell side of shell-and-tube heat exchangers with segmental baffles for different baffle spacings.

TL;DR: In this article, heat and mass transfer characteristics of fin-and-tube heat exchangers with and without hydrophilic coating were reported, and they consisted of three different louvre fin patterns and their corresponding plain fin counterpart.

TL;DR: In this article, a detailed investigation of the forced convective cooling of a heated obstacle mounted upon a channel wall is presented, where the Navier-Stokes equations are used to characterize the flow field surrounding the conductive obstacle.

TL;DR: In this paper, a numerical simulation of forced convective, incompressible flow in a channel with an array of heated obstacles attached to one wall is presented, and three levels of Nusselt numbers are emphasized in this systematic analysis: local distributions along the obstacle exposed faces, mean values for individual faces, and overall obstacle mean values.

TL;DR: In this article, a general formulation based on a weighting average procedure is developed for describing the fire-induced behavior of a multiphase, reactive and radiative medium, which can be used as the basic one for later studies, especially in the framework of wildland fires.

TL;DR: In this paper, the effect of buoyancy ratio on the flow structure is investigated numerically for a binary mixture gas in a rectangular enclosure subject to opposing horizontal thermal and compositional buoyancies.

TL;DR: In this paper, heat transfer coefficients for evaporation of single-component liquids in falling films were experimentally measured over an extended range of parameters, using two different fluids (propylene glycol and water) over a range of absolute pressures.

TL;DR: In this paper, the multidimensional transient temperature profiles of the arterial and venous blood flows and of the tissue within a limb are simulated with the bioheat equations developed by means of the heat transfer principle in porous media.

TL;DR: In this paper, a model for the behavior of an isolated fluid drop of a single compound immersed into another compound in finite, quiescent surroundings at supercritical conditions is developed based upon fluctuation theory which accounts for Soret and Dufour effects in the calculation of the transport matrix relating molar and heat fluxes to the transport properties and the thermodynamic variables.

TL;DR: In this article, the effects of recycling at the ends on the heat and mass transfer through a parallel-plate channel with uniform wall temperature were studied by an orthogonal expansion technique.