Results 311 to 320 of about 9,868,888 (379)

High Rayleigh Number Convection

Annual Review of Fluid Mechanics, 1994
Turbulent convection exemplifies many of the startling aspects of turbulent flows that have been uncovered in the past two decades, but frequently exhibits a novel twist. Thus, as in the case of free shear flows, convection can organize into large-scale vortical structures, but these then react back in subtle ways on the boundary layers which ...
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Natural convection at very high rayleigh numbers

Journal of Computational Physics, 1985
For the ENTWIFE finite element code, authors demonstrate the importance of suitable geometrical choices of the finite elements and of the types of polynomials representing temperature T or pressure p, respectively. Authors employ in particular a nine-noded quadrilateral element with piecewise linear variation of p.
Cliffe, K. A., Jackson, C. P., Winters, K. H.   +2 more
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High Prandtl number effect on Rayleigh–Bénard convection heat transfer at high Rayleigh number

Heat and Mass Transfer, 2016
This paper represents results of the Rayleigh–Benard convection heat transfer in silicon oil confined by two horizontal plates, heated from below, and cooled from above. The Prandtl numbers considered as 100–10,000 corresponding to three types of silicon oil. The experiments covered a range of Rayleigh numbers from 2.14·109 to 2.27·1013.
Li Ma, Jing Li, Shui Ji, Huajian Chang
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Rayleigh number scaling in numerical convection

Journal of Fluid Mechanics, 1996
Using direct simulations of the incompressible Navier-Stokes equations with rigid upper and lower boundaries at fixed temperature and periodic sidewalls, scaling with respect to Rayleigh number is determined. At large aspect ratio (6:6:1) on meshes up to 288 × 288 × 96, a single scaling regime consistent with the properties of ‘hard’ convective ...
Robert McDougall Kerr
semanticscholar   +3 more sources

High Rayleigh Number Thermal Convection

Journal of Low Temperature Physics, 2004
This paper considers the manner in which low temperature helium gas is used to generate turbulent convection, reviews the lessons learned so far, and finally suggests a possible experiment that draws upon these lessons and should yield unambiguous resugts.
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Salt fingers at low Rayleigh numbers

Journal of Fluid Mechanics, 2002
This is a laboratory study of salt fingers at low Rayleigh numbers. We report on the stability boundary in the (RS, RT)-plane (where RS and RT are the salt and heat Rayleigh numbers respectively), the wavenumber of the observed fingers, and the planform. In this low RS, RT range, fingers have width comparable to their height, as predicted by linear
KRISHNAMURTI R., Y. H. JO, STOCCHINO, ALESSANDRO   +2 more
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Nusselt Number Dependence on Aspect Ratio and Rayleigh Number: A Numerical Study of Rayleigh-Benard Instability

Volume 2: Multiphase Flow (MFTC); Computational Fluid Dynamics (CFDTC); Micro and Nano Fluid Dynamics (MNFDTC), 2022
Abstract In this paper, Rayleigh-Benard Convection (RBC) is investigated in a two-dimensional vertical cavity with the horizontal temperature gradient for Rayleigh numbers (Ra) up to 20000. The velocity and temperature fields along with the Nusselt number (Nu) are examined and discussed for various cases of aspect ratios (AR); 1 ≤ AR ...
Wajeeha Siddiqui, Zafar Abbas, Imran Akhtar, Muhammad Saif Ullah Khalid   +3 more
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Convection and Rayleigh Number

2011
Convection may be considered as a part of fluid turbulence and recent research has many parallels with studies of turbulence. For instance, there is considerable interest in coherent structures and intermittency effects. Convection in the environment is almost always a turbulent flow, characterized by unsteady motions over a range of length and ...
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High-Reynolds number Rayleigh–Taylor turbulence

Journal of Turbulence, 2009
The turbulence generated in the variable density Rayleigh–Taylor mixing layer is studied using the high-Reynolds number fully resolved 30723 numerical simulation of Cabot and Cook (Nature Phys. 2 (2006), pp. 562–568). The simulation achieves bulk Reynolds number, Re = H [Hdot]/ν = 32,000, turbulent Reynolds number, Re t = [ktilde] 2/νϵ = 4600, and ...
D. Livescu, J. R. Ristorcelli, R. A. Gore, S. H. Dean, W. H. Cabot, A. W. Cook   +5 more
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A computational study of Rayleigh–Bénard convection. Part 1. Rayleigh-number scaling

Journal of Fluid Mechanics, 1991
A parametric study is made of chaotic Rayleigh–Bénard convection over moderate Rayleigh numbers. As a basis for comparison over the Rayleigh number (Ra) range we consider mean quantities, r.m.s. fluctuations, Reynolds number, probability distributions and power spectra.
Anil E. Deane, Lawrence Sirovich
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