In this paper, the natural convection heat transfer of Al2O3-EG-water nanofluid in a rectangular cavity which is heated from the bottom and is cooled from the top has been investigated numerically. The governing equations for a Newtonian fluid have been solved numerically with a finite volume approach using the SIMPLER algorithm. The main focus of the current study is on the effects of variable...

DENIZ BAŞKENT, PRANESH BHARGAVA, JEFTA SAIJA, JEANNE CLARKE, MICHEL R. BENARD, CARINA PALS, ANASTASIOS SARAMPALIS, ANITA WAGNER, ETIENNE GAUDRAIN 1 University of Groningen, University Medical Centre Groningen, Department of Otorhinolaryngology/Head and Neck Surgery, Groningen, The Netherlands 2 University of Groningen, Graduate School of Medical Sciences, Research School of Behavioural and Cogn...

The onset of thermal convection in a nematic contained in a vertical rotating cylindrical annulus heated from the outside is studied as a function of the planar alignment of the liquid crystal director n. When n is horizontal, the results confirm data on gravitational buoyancy. An original first order like convection mode is obtained when n is parallel to the cylinder axis. Thermal convection i...

2014 We have measured, in a Rayleigh-Benard experiment in liquid helium, the time dependent effects occurring above the onset of convection, using a local probe. Results are very dependent on the aspect ratio 0393, ratio of the cylinder cell radius to its height. For a small aspect ratio, 0393 = 2 and 0393 = 2.5, well defined sharp oscillations are present for a large range of Rayleigh numbers....

The three-dlmensional, incompressible Navler-Stokes and energy equations with the Bousslnesq assumption have been directly simulated at a Rayleigh number of 3.8 x 105 and a Prandtl number of 0.76. In the vertical direction, wall boundaries were used and in the horizontal, periodic boundary conditions were applied. A spectral/finite difference numerical method was used to simulate the flow. At t...