Results 141 to 150 of about 638 (180)

The Onset of Viscoelastic Rayleigh-Benard Convection

1990
Rayleigh-Benard convection in aqueous solutions of polyacrylamide is visualized using holographic interferometry. The results confirm and extend earlier findings of the present authors which showed that the critical Rayleigh-number Rac for the onset of free convection in viscoelastic fluids can be significantly increased as compared to Newtonian fluids
B. Gampert, J. Domjahn
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The Turbulent Regimes of Rayleigh-Benard Convection

1998
A Rayleigh-Benard convection experiment is performed with Helium at low temperature, as the working one-phase fluid [1]. Helium is closed in a cylindrical cell 20 cm high and 10 cm in diameter. Three experimental parameters, independently adjustable, and accurately measured for each fixed condition, allow to study the Rayleigh Benard problem from the ...
X. Chavanne, F. Chilla, B. Castaing, B. Chabaud, B. Hebral, P. Roche   +5 more
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Moist Rayleigh-Benard convection

2015
We report the observations from turbulent thermal Rayleigh-Benard convection experiment with a two-phase liquid-vapor binary mixture. Evaporation/condensation processes in a turbulent convection are accompanied by the formation of cloud like structures above the liquid-vapor interface.
Prabhakaran, P., Winkel, F., Krekhov, A., Nobach, H., Bodenschatz, E. ; https://orcid.org/0000-0002-2901-0144   +4 more
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Hilbert diagnostics of Rayleigh-Benard convection in fluids

Optoelectronics, Instrumentation and Data Processing, 2012
An combined optical and thermal imaging experimental system was designed to investigate Rayleigh-Benard convection of a fluid in a layer with two rigid isothermal boundaries and a free upper boundary under steady and unsteady thermal boundary conditions.
V. A. Arbuzov, E. V. Arbuzov, N. S. Bufetov, E. O. Shlapakova   +3 more
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Effects of boundaries on Rayleigh-Benard convection

1991
The effects of boundary conditions on the linear stability of finite cell pure fluid Rayleigh-Benard convection are investigated via a variational formalism and a perturbative approach. Some general properties of the critical Rayleigh number, Rc, with respect to change of boundary conditions or system size are derived.
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Rotating Rayleigh-Benard convection with modulation

Journal of Physics A: Mathematical and General, 1989
The author considers rotating Rayleigh-Benard convection with modulated rotation speed. Galerkin truncation under realistic, i.e. experimentally realisable, boundary conditions is carried out. The threshold of convection can be raised or lowered depending on the Prandtl number and rotation speed.
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Numerical Study of Rayleigh-Benard Convection in a Rectangular Box

2009
Numerical study for convective instability of a liquid with linear vertical initial temperature profile in a closed box is presented. The paper provides stability analysis of two-dimensional rolls. Results are compared with R. Krishnamurti, F.H. Busse and coworkers data.
V. V. Kolmychkov, O. S. Mazhorova, Yu. P. Popov, O. V. Shcheritsa   +3 more
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Heat transfer enhancement in Rayleigh-Benard convection

International Journal of Heat and Mass Transfer, 1989
Abstract Direct numerical simulations of three-dimensional Rayleigh-Benard convection are performed with non-uniform temperature boundary conditions at the lower plate. The boundary conditions excite convective states in a form of counterrotating convective rolls that remain stable for at least ten eddy-turnover times even if their size is ...
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Simulation of complex regimes of Rayleigh-Benard convection

Numerical Analysis and Applications, 2011
2D and 3D turbulent convectional flows of viscous and incompressible fluids heated from below in a rectangular parallelepiped are numerically simulated. The horizontal boundaries are stress-free in 3D simulation and stress-free or rigid in 2D simulation.
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Numerical simulation of turbulent Rayleigh-Benard convection

Progress in Computational Fluid Dynamics, An International Journal, 2012
The turbulent convection of liquid in a horizontal layer is simulated numerically for the case of heating from below. The liquid is assumed to be viscous and incompressible, and the layer boundaries are assumed to be flat, isothermal, and free from shear stress.
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