Transition from Steady to Oscillatory Flow Natural Convection of Low-Pr Fluids in 3D Bridgman Configuration for Crystal Growth
| Autor: | Aissa Atia, Badia Ghernaout, Said Bouabdallah |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Steady-oscillatory flow
Natural convection Materials science 020209 energy Mechanical Engineering lcsh:Mechanical engineering and machinery Thermodynamics Crystal growth 02 engineering and technology Condensed Matter Physics Physics::Fluid Dynamics Mechanics of Materials 0202 electrical engineering electronic engineering information engineering lcsh:TJ1-1570 3D Natural convection Numerical study Low-Pr fluid Oscillatory flow |
| Zdroj: | Journal of Applied Fluid Mechanics, Vol 11, Iss 4, Pp 1021-1031 (2018) |
| ISSN: | 1735-3572 |
| Popis: | A numerical study of the transition from steady to oscillatory flow natural convection of low- Prandtl number fluids inside the 3D Bridgman configuration has been carried out. The three-dimensional Navier-Stokes and energy equations, with the Boussinesq approximation have been discretized by means of a finite volume procedure which employs a second order accurate central difference scheme to treat diffusive and convective fluxes. In natural convection, the buoyancy force is only driving the flow and its intensity can be move a harmful effect on the crystal growth, such as the striation. Naturally, the steady state flow is obtained for low Rayleigh number and shows a great dependence between the Rayleigh number, the flow structure and the heat transfer rate. A low increase in the Rayleigh number we guide to determine the critical point in which the 3D flow became oscillatory. This regime appears by a sinusoidal signal in the time and developed in each period of time. |
| Databáze: | OpenAIRE |
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