Showing papers in "International Journal of Heat and Mass Transfer in 1996"

TL;DR: The single-phase forced convective heat transfer and flow characteristics of water in microchannel structures/plates with small rectangular channels having hydraulic diameters of 0.133 -0.367 mm were investigated experimentally.

TL;DR: In this article, a new multiphase mixture model is proposed, in which the multiple phases are considered as constituents of a multi-phase mixture and the conservation equations are derived from the classic multiphases flow formulation without making any approximations.

TL;DR: In this article, the authors compared several methods of finding the surface heat flux using transient temperature measurements inside a heat-conducting body, including function specification, Tikhonov regularization, iterative regularization and specified functions over large time regions with Green's functions.

TL;DR: In this paper, the authors deal with natural convection in confined porous media, driven by cooperating thermal and solutal buoyancy forces, and the results are mainly analyzed in terms of the average heat and mass transfers at the walls of the enclosure.

TL;DR: In this article, the performance of a delta winglet type vortex generator in improving heat transfer in plate-fin crossflow heat exchangers has been evaluated in a fully developed laminar channel flow.

TL;DR: In this article, a heat and moisture transfer method based on physical evidence concerning vapour and liquid transport and new experimental results is presented and the required material and climatic data are described.

TL;DR: In this article, a numerical study of the fluid dynamics and heat transfer phenomena during the impingement of a liquid droplet upon a substrate is presented, where a deforming mesh is utilized to simulate accurately the large deformations, as well as the domain nonuniformity characteristic of the spreading process.

TL;DR: In this article, the relationship between the vortical structures and local heat transfer was studied by the means of flow visualization, heat transfer spectra and correlation between velocity and heat transfer.

TL;DR: In this paper, the heat transfer enhancement in the latent heat thermal energy storage system by using an internally finned tube is presented, where the phase change material fills the annular shell space around the tube, while the transfer fluid flows within the internally-finned tube.

TL;DR: In this article, the macroscopic governing equations for turbulent flow through porous media consisting of packed spheres are examined and the 0-equation model is proposed, which can predict the flow and heat transfer characteristics at high Reynolds number.

TL;DR: In this paper, the external convection heat transfer coefficient hc as a function of wind speed for a plane, smooth test surface on the facade of an eight-storey building was measured.

TL;DR: In this paper, the authors describe the method of applying thermochromic liquid crystals and true-colour image processing to give local Nusselt number distribution over the surface and average Nu, both of quantitative reliability; a careful uncertainty analysis is also presented.

TL;DR: In this paper, the impact of water droplets on heated surfaces with different roughness was studied using still and high speed photographic techniques and heat transfer measurements and the study encompassed droplet Weber numbers of 20, 60 and 220 and surface temperatures of 100-280°C.

TL;DR: In this article, the effect of nozzle geometry (diameter and aspect ratio) on the local heat transfer coefficients from a small heat source to a normally impinging, axisymmetric, submerged and confined liquid jet of FC-77 was investigated.

TL;DR: In this article, an experimental and numerical study of flow and heat transfer was conducted for a crossed-corrugated geometry, representative of compact heat exchangers under transitional and weakly turbulent conditions.

TL;DR: In this paper, single-phase liquid and two-phase flow pressure drop were measured for R-12 flowing in both rectangular plain and micro-fin tubes with hydraulic diameters 2.64 and 1.56 mm, respectively.

TL;DR: In this article, a mathematical model was developed to predict heat transfer from the freeboard gas to the bed of a rotary kiln, which is capable of predicting the temperature distribution within the bed and the refractory wall at any axial position of the kiln.

TL;DR: In this paper, a numerical procedure for the solution of vapor bubble growth with radial symmetry from the thermodynamic critical size in an initially uniformly superheated liquid, including the influences of surface tension, liquid inertia and heat diffusion, is presented in the form of time varying interface radius, velocity, acceleration and temperature.

TL;DR: In this article, the authors provided heat transfer data for R-12 condensation and subcooled liquid in small hydraulic diameter, flat extruded aluminum tubes, which contain three internal membranes, separating the flow into four parallel channels.

TL;DR: In this paper, a 3-6-3-1 arrangement was used to predict heat transfer coefficients from a given set of experimentally obtained conditions, with convergence improving directly with both the global learning rates and those of individual layers.

TL;DR: Isothermal and nonisothermal friction factors and mean Nusselt numbers for uniform wall temperature (UWT) heating and cooling of Servotherm oil (Pr = 195-375) were experimentally determined for their flow in a circular tube (Rea = 70-4000) with twisted tape inserts (y = 2.41-4.84) as discussed by the authors.

TL;DR: In this paper, the thermal conductivity of densified random packing of spheres is studied and a continuous analytical expression is proposed to describe the relation between the effective thermal conductivities and the relative density of the packing.

TL;DR: In this article, the effects of different geometrical parameters such as tube arrangement, tube row numbers and fin pitch (8-12 fins per inch) on the Reynolds number were investigated.

TL;DR: In this article, the authors focus on the fundamental issues that influence boiling heat transfer to a free-surface, planar jet of water and present local boiling curves at several streamwise distances from the stagnation line, while streamwise distributions of the surface temperature and convection coefficient.

TL;DR: In this article, the motion of bubbles and the colourplay of a layer of thermochromic liquid crystal on the back of the plate were recorded simultaneously by a high-speed colour video camera at 200 frames/s.

TL;DR: In this article, the geometric optics approximation for radiative scattering from rough surfaces is compared with exact scattering predictions from electromagnetic theory, and the regions of accuracy of the geometric approximation are quantified and presented as a function of surface slope and roughness.

TL;DR: In this paper, the optimal cylinder-to-cylinder spacing is determined by maximizing the overall thermal conductance between all the cylinders and the free stream in cross-flow forced convection.

TL;DR: In this paper, a model based on an additive mechanism of heat transfer is proposed for pool boiling of single component systems, and the authors estimate the nucleation site density from a literature correlation that includes the boiling surface characteristics.

TL;DR: In this article, the non-Fourier effect in a slab subjected to a periodic thermal disturbance is investigated by deriving the analytical solution of the hyperbolic heat conduction equation.

TL;DR: In this article, the authors present a method for a simple and accurate determination of the time-varying heat transfer coefficient (or heat flux) given an accurate temperature history of the body at a selected point beneath the surface.