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Journal of Applied Fluid Mechanics، جلد ۱۱، شماره ۴، صفحات ۱۰۲۱-۱۰۳۱
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عنوان انگلیسی Transition from Steady to Oscillatory Flow Natural Convection of Low-Pr Fluids in 3D Bridgman Configuration for Crystal Growth
چکیده انگلیسی مقاله 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.
کلیدواژه‌های انگلیسی مقاله 3D Natural convection, oscillatory flow, Steady, Low, Pr fluid, Numerical study
نویسندگان مقاله A. Atia |
LME, Laboratory of Mechanics, University of Laghouat, Laghouat 03000, Algeria

B. Ghernaout |
LME, Laboratory of Mechanics, University of Laghouat, Laghouat 03000, Algeria

S. Bouabdallah |
LME, Laboratory of Mechanics, University of Laghouat, Laghouat 03000, Algeria

نشانی اینترنتی https://www.jafmonline.net/article_640_87e279272fc3d90e647e4c6ece361730.pdf
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