Natural convection in square enclosure induced by inner circular cylinder with time-periodic pulsating temperature

Handle URI:
http://hdl.handle.net/10754/566139
Title:
Natural convection in square enclosure induced by inner circular cylinder with time-periodic pulsating temperature
Authors:
Huang, Zhu; Zhang, Wei ( 0000-0001-6323-1234 ) ; Xi, Guang
Abstract:
The periodic unsteady natural convection flow and heat transfer in a square enclosure containing a concentric circular cylinder is numerically studied. The temperature of the inner circular cylinder fluctuates periodically with time at higher averaged value while the temperature of the enclosure keeps lower constant, and the natural convection is driven by the temperature difference. The two-dimensional natural convection is simulated with high accuracy temporal spectral method and local radial basis functions method. The Rayleigh number is studied in the range 103 ≤ Ra ≤ 106, the temperature pulsating period ranges from 0.01 to 100 and the temperature pulsating amplitudes are a = 0.5, 1.0 and 1.5. Numerical results reveal that the fluid flow and heat transfer is strongly dependent on the pulsating temperature of inner cylinder. Comparing with the steady state natural convection, the heat transfer is enhanced generally for the time-periodic unsteady natural convection, and the local maximum heat transfer rate is observed for Ra = 105 and 106. Moreover, the phenomenon of backward heat transfer is discussed quantitatively. Also, the influence of pulsating temperature on the unsteady fluid flow and heat transfer are discussed and analyzed.
KAUST Department:
Mechanical Engineering Program; Physical Sciences and Engineering (PSE) Division
Publisher:
Elsevier BV
Journal:
International Journal of Heat and Mass Transfer
Issue Date:
Mar-2015
DOI:
10.1016/j.ijheatmasstransfer.2014.11.044
Type:
Article
ISSN:
00179310
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorHuang, Zhuen
dc.contributor.authorZhang, Weien
dc.contributor.authorXi, Guangen
dc.date.accessioned2015-08-12T09:29:47Zen
dc.date.available2015-08-12T09:29:47Zen
dc.date.issued2015-03en
dc.identifier.issn00179310en
dc.identifier.doi10.1016/j.ijheatmasstransfer.2014.11.044en
dc.identifier.urihttp://hdl.handle.net/10754/566139en
dc.description.abstractThe periodic unsteady natural convection flow and heat transfer in a square enclosure containing a concentric circular cylinder is numerically studied. The temperature of the inner circular cylinder fluctuates periodically with time at higher averaged value while the temperature of the enclosure keeps lower constant, and the natural convection is driven by the temperature difference. The two-dimensional natural convection is simulated with high accuracy temporal spectral method and local radial basis functions method. The Rayleigh number is studied in the range 103 ≤ Ra ≤ 106, the temperature pulsating period ranges from 0.01 to 100 and the temperature pulsating amplitudes are a = 0.5, 1.0 and 1.5. Numerical results reveal that the fluid flow and heat transfer is strongly dependent on the pulsating temperature of inner cylinder. Comparing with the steady state natural convection, the heat transfer is enhanced generally for the time-periodic unsteady natural convection, and the local maximum heat transfer rate is observed for Ra = 105 and 106. Moreover, the phenomenon of backward heat transfer is discussed quantitatively. Also, the influence of pulsating temperature on the unsteady fluid flow and heat transfer are discussed and analyzed.en
dc.publisherElsevier BVen
dc.subjectBackward heat transferen
dc.subjectHeat transfer enhancementen
dc.subjectLocal radial basis function methoden
dc.subjectTemporal spectral methoden
dc.subjectTime pulsating temperatureen
dc.subjectUnsteady natural convectionen
dc.titleNatural convection in square enclosure induced by inner circular cylinder with time-periodic pulsating temperatureen
dc.typeArticleen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalInternational Journal of Heat and Mass Transferen
kaust.authorZhang, Weien
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