Showing papers in "International Journal of Heat and Fluid Flow in 1997"

TL;DR: In this paper, the effects of electric double layer (EDL) on flow characteristics with different potassium chloride concentrations in water and with different plate materials, P-type silicon, and glass Microchannels with a height ranging from 10 ∼ 280 μm were used in the measurement.

TL;DR: In this article, a nonlinear eddy-viscosity model of turbulence is proposed to predict flow far from equilibrium, including transition, by using a cubic relation between the stress and the strain/vorticity tensors, and a third transport equation for an anisotropy parameter of the stress field.

TL;DR: In this article, the effects of the convex surface curvature on the local heat transfer from an axisymmetric impinging jet were investigated, and the results showed that the stagnation point Nusselt number (Nust) increases with increasing value of d/D.

TL;DR: In this article, the effects of coil geometry and the flow rates of air and water on single-phase and two-phase flow pressure drop were experimentally investigated for annular helicoidal pipes.

TL;DR: In this article, the authors investigated the effect of buoyancy on the turbulent statistics including the mean velocity and temperature, the Reynolds stress tensor, and the turbulent heat flux vector.

TL;DR: In this article, a series of experiments were conducted for the measurement of local convective heat transfer coefficients for an obliquely impinging circular air jet to a flat plate, with the oblique angles selected were 90°, 75°, 60° and 45°, with 90° being a vertical jet.

TL;DR: In this article, a two-dimensional (2D) heat transfer analysis is performed in one-and two-row tubes and plate fin heat exchangers (circular and elliptical sections), using experimentally determined heat transfer coefficients from a heat and mass transfer analogy.

TL;DR: In this paper, large-flow structures, not observed in turbulent Poiseuille flow, are found in direct numerical simulations of turbulent Couette flow, and an interpretation is presented which approximates them by a secondary flow.

TL;DR: In this article, the authors evaluated the pressure loss coefficient C l for a range of Reynolds numbers and compared the results with existing simplified theory, which is based on a one-dimensional (1-D) overall balance of energy and momentum.

TL;DR: In this article, the velocity components of a Newtonian and a weakly elastic shear-thinning non-Newtonian fluid have been measured in an annulus with an eccentricity of 0.5 and an inner cylinder rotation of 300 rpm.

TL;DR: In this paper, the authors present results of the computation of natural convection in the tall cavity, obtained with a fully differential and a four-equation (k−e− θ 2 −e θθ ) algebraic model.

TL;DR: In this paper, a new type of two-equation turbulence model that incorporates some essential characteristics of second-order closure models is proposed, which is applicable to complex turbulent flows with separation and reattachment.

TL;DR: In this article, the authors compared 10 two-equation turbulence models with near-wall corrections by applying them to calculate plane Couette flow and found that the asymptotically consistent k-τ and k-ω models performed the best compared to direct numerical simulation data and experimental measurements.

TL;DR: In this paper, a low-Reynolds number k−ϵ turbulence model is used in conjunction with combined heat and mass transfer analysis in an asymmetrically heated, parallel-plate vertical channel.

TL;DR: In this paper, a steady flow field had been established by maintaining different temperatures at the two vertical sidewalls, and this effect was represented by the external Rayleigh number RaE.

TL;DR: In this paper, a direct numerical simulation (DNS) of natural turbulent convection in a differentially heated infinite vertical slot has been computed with a mixed finite difference/Fourier code at Rayleigh numbers of R a = 1.0 10 5 and R b = 5.4 10 5.

TL;DR: In this article, a theoretical analysis of laminar free-convection flow over a vertical isothermal wavy surface in a non-Newtonian power-law fluid is considered.

TL;DR: In this article, the turbulent fluid flow and heat transfer characteristics of heated rectangular plates such as fins mounted over a surface are investigated by numerical simulation using a finite-volume method, taking into account effects of variation of the fin blockage ratio and flow Reynolds number along the block surfaces.

TL;DR: In this paper, the authors presented experimental results concerning the fluctuating temperature intensity, cross-correlation coefficients between fluctuating velocity and temperature, and the turbulent heat fluxes obtained for forced-convection heat transfer in a square duct.

TL;DR: Doppler global velocimetry (DGV) as mentioned in this paper is a new technique for velocity measurement in fluid flow fields based on the use of laser technology, which has been the subject of much research over the last three decades.

TL;DR: In this paper, the authors consider the question, "What progress has the human race made in the subject in the last quarter-century?” As always on these occasions, progress in some directions seems to have been slow, while other branches concerning the subject have advanced with amazing rapidity.

TL;DR: In this article, a two-dimensional (2D) time-dependent Navier-Stokes procedure was formulated, which encompasses aspects from both the large-eddy simulation (LES) formalism and the conventional k−ϵ procedures.

TL;DR: In this paper, a separated flow model has been developed that is applicable to vertical annular two-phase flow in the purely convective heat transfer regime, where conservation of mass, momentum, and energy are used to solve for the liquid film thickness, pressure drop, and heat transfer coefficient.

TL;DR: In this paper, an experimental technique and measurement method was used for the investigation of the local convective heat transfer from cubical protrusions placed on a vertical wall of a rectangular-sectioned wind tunnel.

TL;DR: In this article, a mathematical model for forced-air precooling of spherical food products in bulk is developed, where foods are arranged in horizontal layers stacked one above the other to form a rectangular parallelepiped with a vertical gap in between the product layers.

TL;DR: In this article, a 3D Navier-Stokes code with film injection and the measured heat flux on a fully film-cooled rotating transonic turbine blade was compared to the Nusselt number data obtained on a rotating turbine blade.

TL;DR: In this paper, two-phase friction and heat transfer characteristics for R-22/R-407C inside a 6.5mm smooth tube were reported, and the adiabatic frictional pressure drop was recorded in the range of 100 to 700 kg/m2 s.

TL;DR: In this paper, the authors examined global fluid mixing and mass transfer in cavities with time-periodic lid velocity and found that the oscillation frequency has little effect on mass transfer between the walls at different concentrations.

TL;DR: In this article, the Brinkman-extended Darcy model was used to solve the non-slip boundary condition on a solid wall, and the governing equations were solved analytically, under the boundary-layer approximations, using the modified Oseen technique.

TL;DR: In this article, an experimental and numerical assessment of the stability of a solid propellant motor was conducted based on an experimental study carried out on a cold-flow, reduced-scale, bidimensional duct with a complex internal geometry.