Comments on ’’Variable fluid properties in Bénard convection’’
نویسندگان
چکیده
منابع مشابه
Dynamical properties of multiarmed global spirals in Rayleigh-Bénard convection.
Explicit formulas for the rotation frequency and the long-wavenumber diffusion coefficients of global spirals with m arms in Rayleigh-Bénard convection are obtained. Global spirals and parallel rolls share exactly the same Eckhaus, zigzag and skewed-varicose instability boundaries. Global spirals seem not to have a characteristic frequency ωm or a typical size Rm, but their product ωmRm is a co...
متن کاملModal spectra extracted from nonequilibrium fluid patterns in laboratory experiments on Rayleigh-Bénard convection.
We describe a method to extract from experimental data the important dynamical modes in spatiotemporal patterns in a system driven out of thermodynamic equilibrium. Using a novel optical technique for controlling fluid flow, we create an experimental ensemble of Rayleigh-Bénard convection patterns with nearby initial conditions close to the onset of secondary instability. An analysis of the ens...
متن کاملExtensive chaos in Rayleigh-Bénard convection.
Using large-scale numerical calculations we explore spatiotemporal chaos in Rayleigh-Bénard convection for experimentally relevant conditions. We calculate the spectrum of Lyapunov exponents and the Lyapunov dimension describing the chaotic dynamics of the convective fluid layer at constant thermal driving over a range of finite system sizes. Our results reveal that the dynamics of fluid convec...
متن کاملTraveling waves in rotating Rayleigh-Bénard convection.
A combined analytical, numerical, and experimental study of the traveling-wave wall mode in rotating Rayleigh-Bénard convection is presented. No-slip top and bottom boundary conditions are used for the numerical computation of the linear stability, and the coefficients of the linear complex Ginzburg-Landau equation are then computed for various rotation rates. Numerical results for the no-slip ...
متن کاملEffect of Variable Thermal Expansion Coefficient and Nanofluid Properties on Steady Natural Convection in an Enclosure
Steady state natural convection is numerically investigated in an enclosure using variable thermal conductivity, viscosity and thermal expansion coefficient of Al2O3–water nanofluid. This study has been conducted for a wide range of Rayleigh numbers (103≤ Ra ≤ 106), concentrations of nanoparticles (0% ≤ Φ ≤ 7%), enclosure aspect ratios (0.5 ≤ AR ≤ 2) and temperature differences between the cold...
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ژورنال
عنوان ژورنال: Physics of Fluids
سال: 1975
ISSN: 0031-9171
DOI: 10.1063/1.861099