Direct numerical simulation of unsteady natural convection boundary layers on an evenly heated plate with time-varying heating flux
Conference Publication ResearchOnline@JCUAbstract
It is of fundamental significance and application importance to fully understand the flow behavior of unsteady natural convection boundary layers under time-dependent heating conditions. Such an understanding is currently scarce. In this paper, a series of scalings developed for the major parameters representing the flow behavior of the unsteady natural convection boundary layer of a homogeneous Newtonian fluid with Pr>1 adjacent to a vertical plate evenly heated with a time-varying sinusoidal heat flux were validated by comparison to ten direct numerical simulations. These scaling provide relations between these parameters with the governing parameters of the flow, i.e., the Rayleigh number (Ra), the Prandtl number (Pr), and the dimensionless natural frequency (fn) of the time-varying sinusoidal heat flux, at the start-up stage, at the critical time, and at the quasi-steady state. The results show that in general these scalings provide an accurate description of the flow at different development stages.
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APCOM and ISCM 2013: 5th Asia Pacific Congress on Computational Mechanics and 4th International Symposium on Computational Mechanics
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8
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Singapore
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Scientech Publisher USA
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Singapore
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