Unsteady natural convection within an attic-shaped space subject to sinusoidal heat flux on inclined walls

Saha, SC; Sefidan, AM; Sojoudi, A

Unsteady natural convection within an attic-shaped space subject to sinusoidal heat flux on inclined walls

Saha, SC Sefidan, AM Sojoudi, A

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Publisher:: Computers, Materials and Continua (Tech Science Press)
Publication Type:: Journal Article
Citation:: Energy Engineering: Journal of the Association of Energy Engineering, 2020, 117, (1), pp. 1-17
Issue Date:: 2020-01-01

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Field	Value	Language
dc.contributor.author	Saha, SC
dc.contributor.author	Sefidan, AM
dc.contributor.author	Sojoudi, A
dc.date.accessioned	2020-08-15T00:37:12Z
dc.date.available	2020-08-15T00:37:12Z
dc.date.issued	2020-01-01
dc.identifier.citation	Energy Engineering: Journal of the Association of Energy Engineering, 2020, 117, (1), pp. 1-17
dc.identifier.issn	0199-8595
dc.identifier.issn	1546-0118
dc.identifier.uri	http://hdl.handle.net/10453/142117
dc.description.abstract	© 2020, Tech Science Press. All rights reserved. Free convection inside an attic enclosure in which sinusoidal heat flux applied on the inclined walls and a constant temperature applied on the base wall has been investigated numerically to demonstrate the primary flow characteristics and heat transfer within the attic enclosure over daily routine cycles. To solve the governing equations, the finite volume technique has been utilized. After performing the grid independency and time step size tests, the roles of Rayleigh number (Ra) and the attic aspect ratio (AR) on the unsteady flow structure and heat transfer phenomenon are explained for a constant Prandtl number (0.72) for the air. Results are illustrated as a form of stream function and isotherms. Moreover, heat transfer is calculated in terms of Nusselt number. The numerical simulations reveal stratified flow within the enclosure during the daytime nonlinear heating stage. However, during night-time, nonlinear cooling stage the flow turns into unstable as the forms of rising and sinking plumes for sufficiently higher Rayleigh number.
dc.language	en
dc.publisher	Computers, Materials and Continua (Tech Science Press)
dc.relation.ispartof	Energy Engineering: Journal of the Association of Energy Engineering
dc.relation.isbasedon	10.32604/EE.2020.010418
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0914 Resources Engineering and Extractive Metallurgy
dc.subject.classification	Energy
dc.title	Unsteady natural convection within an attic-shaped space subject to sinusoidal heat flux on inclined walls
dc.type	Journal Article
utslib.citation.volume	117
utslib.for	0914 Resources Engineering and Extractive Metallurgy
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	open_access	*
dc.date.updated	2020-08-15T00:37:04Z
pubs.issue	1
pubs.publication-status	Published
pubs.volume	117
utslib.citation.issue	1

Abstract:

© 2020, Tech Science Press. All rights reserved. Free convection inside an attic enclosure in which sinusoidal heat flux applied on the inclined walls and a constant temperature applied on the base wall has been investigated numerically to demonstrate the primary flow characteristics and heat transfer within the attic enclosure over daily routine cycles. To solve the governing equations, the finite volume technique has been utilized. After performing the grid independency and time step size tests, the roles of Rayleigh number (Ra) and the attic aspect ratio (AR) on the unsteady flow structure and heat transfer phenomenon are explained for a constant Prandtl number (0.72) for the air. Results are illustrated as a form of stream function and isotherms. Moreover, heat transfer is calculated in terms of Nusselt number. The numerical simulations reveal stratified flow within the enclosure during the daytime nonlinear heating stage. However, during night-time, nonlinear cooling stage the flow turns into unstable as the forms of rising and sinking plumes for sufficiently higher Rayleigh number.

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http://hdl.handle.net/10453/142117