Free convection flow and heat transfer within attics in cold climate

Cui, H; Wang, W; Xu, F; Saha, S; Liu, Q

Free convection flow and heat transfer within attics in cold climate

Cui, H Wang, W Xu, F Saha, S

Liu, Q

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Publisher:: National Library of Serbia
Publication Type:: Journal Article
Citation:: Thermal Science, 2022, (00), pp. 39-39
Issue Date:: 2022-01-01

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Field	Value	Language
dc.contributor.author	Cui, H
dc.contributor.author	Wang, W
dc.contributor.author	Xu, F
dc.contributor.author	Saha, S https://orcid.org/0000-0002-9962-8919
dc.contributor.author	Liu, Q
dc.date.accessioned	2022-06-16T05:51:31Z
dc.date.available	2022-06-16T05:51:31Z
dc.date.issued	2022-01-01
dc.identifier.citation	Thermal Science, 2022, (00), pp. 39-39
dc.identifier.issn	0354-9836
dc.identifier.issn	2334-7163
dc.identifier.uri	http://hdl.handle.net/10453/158212
dc.description.abstract	<jats:p>The transitional free convection flow and heat transfer within attics in cold climate are investigated using three-dimensional numerical simulations for a range of Rayleigh numbers from 103 to 106 and height-length ratios from 0.1 to 1.5. The development process of free convection in the attic could be classified into three stages: an initial stage, a transitional stage and a fully developed stage. Flow structures in different stages including transverse and longitudinal rolls are critically analyzed in terms of the location and strength of convection rolls and their impacts on the heat transfer. The transition to unsteady flow and asymmetry flow in the fully developed stage is discussed for the fixed height-length ratio 0.5. Various flow regimes are given in a bifurcation diagram in the parameter space of Rayleigh numbers (102<Ra<107) for height-length ratios (0.1<A<1.5). The time series of heat transfer rate through the bottom wall is quantified for different height-length ratios. The overall heat transfer rate for the low Prandtl fluid (Pr=0.7) could be enhanced based on three-dimensional flow structure.</jats:p>
dc.language	en
dc.publisher	National Library of Serbia
dc.publisher	http://www.doiserbia.nb.rs/Article.aspx?ID=0354-98362200039C#.YqrJot-uY2w
dc.relation.ispartof	Thermal Science
dc.relation.isbasedon	10.2298/tsci210826039c
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0904 Chemical Engineering, 0913 Mechanical Engineering, 0914 Resources Engineering and Extractive Metallurgy
dc.subject.classification	Energy
dc.title	Free convection flow and heat transfer within attics in cold climate
dc.type	Journal Article
utslib.for	0904 Chemical Engineering
utslib.for	0913 Mechanical Engineering
utslib.for	0914 Resources Engineering and Extractive Metallurgy
pubs.organisational-group	/University of Technology Sydney
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
utslib.copyright.status	recently_added	*
dc.date.updated	2022-06-16T05:51:30Z
pubs.issue	00
pubs.publication-status	Published
utslib.citation.issue	00

Abstract:

The transitional free convection flow and heat transfer within attics in cold climate are investigated using three-dimensional numerical simulations for a range of Rayleigh numbers from 103 to 106 and height-length ratios from 0.1 to 1.5. The development process of free convection in the attic could be classified into three stages: an initial stage, a transitional stage and a fully developed stage. Flow structures in different stages including transverse and longitudinal rolls are critically analyzed in terms of the location and strength of convection rolls and their impacts on the heat transfer. The transition to unsteady flow and asymmetry flow in the fully developed stage is discussed for the fixed height-length ratio 0.5. Various flow regimes are given in a bifurcation diagram in the parameter space of Rayleigh numbers (102

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http://hdl.handle.net/10453/158212