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Article: Forced convective heat transfer over ribs at various separation
Title | Forced convective heat transfer over ribs at various separation |
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Authors | |
Keywords | Large-eddy simulation Local heat transfer coefficient Turbulent boundary layer Dividing streamline Flow instabilities |
Issue Date | 2012 |
Publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijhmt |
Citation | International Journal of Heat and Mass Transfer, 2012, v. 55 n. 19-20, p. 5111-5119 How to Cite? |
Abstract | Flow over transverse ribs is a fundamental problem that has numerous applications in a range of scales from turbine cooling to urban roughness. It can be broadly divided into k-type or d-type flows exhibiting different characteristics. In this study, large-eddy simulation (LES) is used to examine the flows between two ribs at various separation and compare the local heat transfer coefficient (LHTC) on the cavity bottom. Flow instability initiates a dividing streamline at the leeward edge. In k-type flows, it reattaches at the cavity bottom that splits into a leeward recirculation and a windward redeveloping turbulent boundary layer (TBL). Heat removal from the recirculation and the redeveloping TBL is governed by intermittency and entrainment, respectively. Moreover, the dividing streamline impinges on the cavity bottom leading to a local maximum of LHTC. In d-type flows, the dividing streamline covers the cavity isolating the recirculation from the prevailing flow aloft. Heat is therefore solely removed by intermittency in which the LHTC increases monotonically from the leeward to the windward sides. © 2012 Elsevier Ltd. All rights reserved. |
Persistent Identifier | http://hdl.handle.net/10722/157200 |
ISSN | 2023 Impact Factor: 5.0 2023 SCImago Journal Rankings: 1.224 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Liu, CH | en_US |
dc.contributor.author | Chung, TNH | en_US |
dc.date.accessioned | 2012-08-08T08:45:47Z | - |
dc.date.available | 2012-08-08T08:45:47Z | - |
dc.date.issued | 2012 | en_US |
dc.identifier.citation | International Journal of Heat and Mass Transfer, 2012, v. 55 n. 19-20, p. 5111-5119 | en_US |
dc.identifier.issn | 0017-9310 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/157200 | - |
dc.description.abstract | Flow over transverse ribs is a fundamental problem that has numerous applications in a range of scales from turbine cooling to urban roughness. It can be broadly divided into k-type or d-type flows exhibiting different characteristics. In this study, large-eddy simulation (LES) is used to examine the flows between two ribs at various separation and compare the local heat transfer coefficient (LHTC) on the cavity bottom. Flow instability initiates a dividing streamline at the leeward edge. In k-type flows, it reattaches at the cavity bottom that splits into a leeward recirculation and a windward redeveloping turbulent boundary layer (TBL). Heat removal from the recirculation and the redeveloping TBL is governed by intermittency and entrainment, respectively. Moreover, the dividing streamline impinges on the cavity bottom leading to a local maximum of LHTC. In d-type flows, the dividing streamline covers the cavity isolating the recirculation from the prevailing flow aloft. Heat is therefore solely removed by intermittency in which the LHTC increases monotonically from the leeward to the windward sides. © 2012 Elsevier Ltd. All rights reserved. | en_US |
dc.language | eng | en_US |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijhmt | en_US |
dc.relation.ispartof | International Journal of Heat and Mass Transfer | en_US |
dc.rights | NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Heat and Mass Transfer. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Heat and Mass Transfer, 2012, v. 55 n. 19-20, p. 5111-5119. DOI: 10.1016/j.ijheatmasstransfer.2012.05.012 | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject | Large-eddy simulation | en_US |
dc.subject | Local heat transfer coefficient | en_US |
dc.subject | Turbulent boundary layer | en_US |
dc.subject | Dividing streamline | - |
dc.subject | Flow instabilities | - |
dc.title | Forced convective heat transfer over ribs at various separation | en_US |
dc.type | Article | en_US |
dc.identifier.email | Liu, CH:chliu@hkucc.hku.hk | en_US |
dc.identifier.authority | Liu, CH=rp00152 | en_US |
dc.description.nature | preprint | en_US |
dc.identifier.doi | 10.1016/j.ijheatmasstransfer.2012.05.012 | en_US |
dc.identifier.scopus | eid_2-s2.0-84863526348 | - |
dc.identifier.hkuros | 208066 | - |
dc.identifier.hkuros | 208069 | en_US |
dc.identifier.volume | 55 | - |
dc.identifier.issue | 19-20 | - |
dc.identifier.spage | 5111 | - |
dc.identifier.epage | 5119 | - |
dc.identifier.eissn | 1879-2189 | - |
dc.identifier.isi | WOS:000306774400021 | - |
dc.publisher.place | United Kingdom | en_US |
dc.identifier.scopusauthorid | Chung, TNH=55228841800 | en_US |
dc.identifier.scopusauthorid | Liu, CH=36065161300 | en_US |
dc.identifier.citeulike | 10867430 | - |
dc.identifier.issnl | 0017-9310 | - |