Scaling of natural convection of an inclined flat plate : ramp cooling condition

Saha, Suvash C., Patterson, John C., & Lei, Chengwang (2010) Scaling of natural convection of an inclined flat plate : ramp cooling condition. International Journal of Heat and Mass Transfer, 53(23-24), 5156-5166 .

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A scaling analysis is performed for the transient boundary layer established adjacent to an inclined flat plate following a ramp cooling boundary condition. The imposed wall temperature decreases linearly up to a specific value over a specific time. It is revealed that if the ramp time is sufficiently large then the boundary layer reaches quasi-steady mode before the growth of the temperature is finished. However, if the ramp time is shorter then the steady state of the boundary layer may be reached after the growth of the temperature is completed. In this case, the ultimate steady state is the same as if the start up had been instantaneous. Note that the cold boundary layer adjacent to the plate is potentially unstable to Rayleigh-Bénard instability if the Rayleigh number exceeds a certain critical value for this cooling case. The onset of instability may set in at different stages of the boundary layer development. A proper identification of the time when the instability may set in is discussed. A numerical verification of the time for the onset of instability is presented in this study. Different flow regimes based on the stability of the boundary layer have also been discussed with numerical results.

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11 citations in Web of Science®

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ID Code: 44106
Item Type: Journal Article
Refereed: Yes
Keywords: Natural convection, Ramp cooling, Boundary layer, Unsteady flow, Instability
DOI: 10.1016/j.ijheatmasstransfer.2010.07.047
ISSN: 00179310
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Numerical Modelling and Mechanical Characterisation (091307)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2010 Elsevier
Deposited On: 22 Aug 2011 00:55
Last Modified: 26 Mar 2013 14:32

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