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Scaling of free convection heat transfer in a triangular cavity for Pr>1

Saha, Suvash C. (2011) Scaling of free convection heat transfer in a triangular cavity for Pr>1. Energy and Buildings, 43(10), pp. 2908-2917.

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Abstract

Unsteady natural convection inside a triangular cavity subject to a non-instantaneous heating on the inclined walls in the form of an imposed temperature which increases linearly up to a prescribed steady value over a prescribed time is reported. The development of the flow from start-up to a steady-state has been described based on scaling analyses and direct numerical simulations. The ramp temperature has been chosen in such a way that the boundary layer is reached a quasi-steady mode before the growth of the temperature is completed. In this mode the thermal boundary layer at first grows in thickness, then contracts with increasing time. However, if the imposed wall temperature growth period is sufficiently short, the boundary layer develops differently. It is seen that the shape of many houses are isosceles triangular cross-section. The heat transfer process through the roof of the attic-shaped space should be well understood. Because, in the building energy, one of the most important objectives for design and construction of houses is to provide thermal comfort for occupants. Moreover, in the present energy-conscious society it is also a requirement for houses to be energy efficient, i.e. the energy consumption for heating or air-conditioning houses must be minimized.

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10 citations in Scopus
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8 citations in Web of Science®

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ID Code: 44120
Item Type: Journal Article
Keywords: Natural convection, Ramp heating, Boundary layer, Unsteady flow, Scaling, Heating up time, Triangular cavity
DOI: 10.1016/j.enbuild.2011.07.016
ISSN: 1872-6178
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 2011 Elsevier B.V.
Deposited On: 26 Aug 2011 07:33
Last Modified: 15 Sep 2013 03:23

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