Convective instability in a time-dependent buoyancy driven boundary layer
Brooker, A.M.H., Patterson, J.C., Graham, T., and Schöpf, W. (2000) Convective instability in a time-dependent buoyancy driven boundary layer. International Journal of Heat and Mass Transfer, 43 (2). pp. 297-310.
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The stability of the parallel time-dependent boundary layer adjacent to a suddenly heated vertical wall is described. The flow is investigated through experiments in water, through direct numerical simulation and also through linear stability analysis. The full numerical simulation of the flow shows that small perturbations to the wall boundary conditions, that are also present in the experimental study, are responsible for triggering the instability. As a result, oscillatory behaviour in the boundary layer is observed well before the transition to a steady two-dimensional flow begins. The properties of the observed oscillations are compared with those predicted by a linear stability analysis of the unsteady boundary layer using a quasi-stationary assumption and also using non-stationary assumptions by the formulation of parabolized stability equations (PSE).
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||natural convection; stability; unsteady|
|Date Deposited:||19 Jul 2012 00:27|
|FoR Codes:||09 ENGINEERING > 0915 Interdisciplinary Engineering > 091505 Heat and Mass Transfer Operations @ 100%|
|SEO Codes:||97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%|