Results 221 to 230 of about 35,832 (271)

Molecular dynamics and Rayleigh–Benard convection

The Journal of Chemical Physics, 1989
A number of recent molecular dynamic studies have shown that transient convection cells can occur in hard disk systems containing as few as 5000 particles. We extend these studies, with special attention to the role of the various algorithms used to impose thermal boundary conditions.
James A. Given, Enrico Clementi
openaire   +1 more source

Significant photothermal conversion enhancement of nanofluids induced by Rayleigh-Bénard convection for direct absorption solar collectors

Applied Energy, 2019
Large temperature gradients and serious nanoparticles aggregation are the two vital issues, which lead to a low photothermal conversion efficiency of Nanofluids-Based Direct Absorption Solar Collectors (NB-DASCs) in the solar thermal utilization.
Kongxiang Wang, Yan He, Ankang Kan, Wei Yu, Debing Wang, Liyie Zhang, Guihua Zhu, Huaqing Xie, X. She   +8 more
semanticscholar   +1 more source

Bifurcation control of Rayleigh-Benard convection

Proceedings of the 1999 IEEE International Conference on Control Applications (Cat. No.99CH36328), 2003
Bifurcation control deals with the modification of the bifurcation characteristics of a parametrized nonlinear system by a judiciously designed control input. In this paper, we investigate the problem of active control of Rayleigh-Benard convection (RBC) via a bifurcation control approach.
null Dong Chen, H.O. Wang, L.E. Howle
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Momentum flux in Rayleigh–Benard convection

Physica A: Statistical Mechanics and its Applications, 2004
Abstract The statistical quantities concerning the momentum flux in the Rayleigh–Benard convection are investigated in detail. The transition from soft turbulence to hard turbulence is captured through the momentum flux. The time series of the momentum flux is studied and its power spectrum shows the sign of the transition.
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Controlling flow reversal in two-dimensional Rayleigh–Bénard convection

Journal of Fluid Mechanics, 2020
In this paper, we report that reversals of large-scale circulation in two-dimensional Rayleigh–Bénard convection could be suppressed or enhanced by imposing local constant-temperature control on sidewalls. When the control area is away from the centre of
Shengqi Zhang, Zhenhua Xia, Quan Zhou, Shiyi Chen   +3 more
semanticscholar   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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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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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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.
openaire   +1 more source