Natural convection and heat transfer in attics subject to periodic thermal forcing
Saha, Suvash C., Patterson, John C., & Lei, Chengwang (2010) Natural convection and heat transfer in attics subject to periodic thermal forcing. International Journal of Thermal Sciences, 49(10), 1899-1910 .
The heat transfer through the attics of buildings under realistic thermal forcing has been considered in this study. A periodic temperature boundary condition is applied on the sloping walls of the attic to show the basic flow features in the attic space over diurnal cycles. The numerical results reveal that, during the daytime heating stage, the flow in the attic space is stratified; whereas at the night-time cooling stage, the flow becomes unstable. A symmetrical solution is seen for relatively low Rayleigh numbers. However, as the Ra gradually increases, a transition occurs at a critical value of Ra. Above this critical value, an asymmetrical solution exhibiting a pitchfork bifurcation arises at the night-time. It is also found that the calculated heat transfer rate at the night-time cooling stage is much higher than that during the daytime heating stage.
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|Item Type:||Journal Article|
|Keywords:||Natural convection, Periodic condition, Asymmetric flow, Nusselt number, Stream lines|
|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 Masson.|
|Deposited On:||21 Aug 2011 23:56|
|Last Modified:||27 Mar 2013 07:52|
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