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Natural convection in attic-shaped spaces subject to sudden and ramp heating boundary conditions

Authors :
Saha, Suvash
Patterson, John
Lei, Chengwang
Saha, Suvash
Patterson, John
Lei, Chengwang
Source :
Heat and Mass Transfer
Publication Year :
2010

Abstract

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.

Details

Database :
OAIster
Journal :
Heat and Mass Transfer
Notes :
application/pdf
Publication Type :
Electronic Resource
Accession number :
edsoai.ocn752572647
Document Type :
Electronic Resource