Natural convection in attic-shaped spaces subject to sudden and ramp heating boundary conditions
Saha, Suvash C., Patterson, John C., & Lei, Chengwang (2010) Natural convection in attic-shaped spaces subject to sudden and ramp heating boundary conditions. Heat and Mass Transfer, 46(6), pp. 621-638.
In this study, a discussion of the fluid dynamics in the attic space is reported, focusing on its transient response to sudden and linear changes of temperature along the two inclined walls. The transient behaviour of an attic space is relevant to our daily life. The instantaneous and non-instantaneous (ramp) heating boundary condition is applied on the sloping walls of the attic space. A theoretical understanding of the transient behaviour of the flow in the enclosure is performed through scaling analysis. A proper identification of the timescales, the velocity and the thickness relevant to the flow that develops inside the cavity makes it possible to predict theoretically the basic flow features that will survive once the thermal flow in the enclosure reaches a steady state. A time scale for the heating-up of the whole cavity together with the heat transfer scales through the inclined walls has also been obtained through scaling analysis. All scales are verified by the numerical simulations.
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|Item Type:||Journal Article|
|Keywords:||Natural convection, Ramp heating, Boundary layer, Unsteady flow, Heating-up time|
|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 Springer.|
|Deposited On:||22 Aug 2011 10:04|
|Last Modified:||10 Apr 2013 16:04|
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