The fluid flow and heat transfer in lid-driven enclosures filled with Cu-water nanofluid is numerically investigated. The moving vertical walls of the enclosure  are maintained in a constant temperature, while the horizontal walls are insulated. The hybrid scheme is used to discretize the convection terms and SIMPLER algorithm is adopted to couple the velocity field and pressure in the momentum...

2014 The buckling of long rectangular elastic plates offers the possibility of testing a recent proposal. The wavenumber of cellular structures in slightly supercritical conditions is determined by the boundary conditions. In the present case a supercritical decrease of the wavelength is predicted. Tome 42 ? 1 ler JANVIER 1981 LE JOURNAL DE PHYSIQUE LETTRES J. Physique LETTRES 42 (1981) LI L-4 ...

2014 In a Rayleigh-Bénard experiment in liquid helium, we study the time-dependent regimes, above the onset of convection, in a parallelepipedic cell with two convective rolls of oblate cross-section 03B1 = 1.90, where 03B1 is the rolls wave number. A first frequency f1, associated to oscillating rolls, appears for a Rayleigh number R ~ 2 x 104, then for R ~ 2.7 104 a second frequency f2, much ...

In this paper we review main results of Raleigh Bénard convection. Keywords—Convection, Turbulence Thermal convection is present everywhere. We find it in heating sauce pans, boilers, furnaces, and in the atmospheres of planets and stars. Convection is one of the most studied problem in sciences and engineering due to its enormous practical importance. Yet there are many unresolved issues in th...

[1] We investigate the physics of multiscale convection in Earth’s mantle, characterized by the coexistence of large-scale mantle circulation associated with plate tectonics and smallscale sublithospheric convection. In part 2 of our study, the temporal and spatial evolution of sublithospheric convection is studied using two-dimensional whole mantle convection models with temperatureand depth-d...

Convection in chemical fronts enhances the speed and determines the curvature of the front. Convection is due to density gradients across the front. Fronts propagating in narrow vertical tubes do not exhibit convection, while convection develops in tubes of larger diameter. The transition to convection is determined not only by the tube diameter, but also by the type of chemical reaction. We de...