Numerical investigation of natural convection in two enclosures separated by anisotropic solid wall

Handle URI:
http://hdl.handle.net/10754/563808
Title:
Numerical investigation of natural convection in two enclosures separated by anisotropic solid wall
Authors:
Salama, Amgad ( 0000-0002-4463-1010 ) ; El-Amin, Mohamed ( 0000-0002-1099-2299 ) ; Sun, Shuyu ( 0000-0002-3078-864X )
Abstract:
Purpose: The problem of natural convection in two cavities separated by an anisotropic central solid wall is considered numerically. When the thermal conductivity of the central wall is anisotropic, heat flux and temperature gradient vectors are no longer coincidence. This apparently has interesting influences on the heat and fluid flow patterns in this system. The paper aims to discuss these issues.Design/methodology/approach: In this work, several flow patterns have been investigated covering a wide range of Rayleigh number up to 108. Several thermal conductivity anisotropy scenarios of the central wall have been investigated including 0, 30, 60, 120 and 1501 principal anisotropy directions. The governing equations have been solved using control volume approach.Findings: Probably the most intriguing is that, for some anisotropy scenarios it is found that the temperature at the same elevation at the side of the central wall which is closer to the colder wall is higher than that at the side closer to the hot wall. Apparently this defies intuition which suggests the reverse to have happened. However, this behavior may be explained in light of the effect of anisotropy. Furthermore, the patterns of streamlines and temperature fields in the two enclosures also changes as a consequence of the change of the central wall temperatures for the different anisotropy scenarios.Originality/value: This work discusses a very interesting topic related to heat energy exchange among two compartments when the separating wall is anisotropic. In some anisotropy scenarios, this leads to more uniform distribution of Nusselt number than the case when the wall is isotropic. Interesting patterns of natural convection is investigated.
KAUST Department:
Computational Transport Phenomena Lab; Physical Sciences and Engineering (PSE) Division; Environmental Science and Engineering Program; Earth Science and Engineering Program
Publisher:
Emerald
Journal:
International Journal of Numerical Methods for Heat & Fluid Flow
Issue Date:
28-Oct-2014
DOI:
10.1108/HFF-09-2013-0268
Type:
Article
ISSN:
09615539
Appears in Collections:
Articles; Environmental Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; Earth Science and Engineering Program; Computational Transport Phenomena Lab

Full metadata record

DC FieldValue Language
dc.contributor.authorSalama, Amgaden
dc.contributor.authorEl-Amin, Mohameden
dc.contributor.authorSun, Shuyuen
dc.date.accessioned2015-08-03T12:10:50Zen
dc.date.available2015-08-03T12:10:50Zen
dc.date.issued2014-10-28en
dc.identifier.issn09615539en
dc.identifier.doi10.1108/HFF-09-2013-0268en
dc.identifier.urihttp://hdl.handle.net/10754/563808en
dc.description.abstractPurpose: The problem of natural convection in two cavities separated by an anisotropic central solid wall is considered numerically. When the thermal conductivity of the central wall is anisotropic, heat flux and temperature gradient vectors are no longer coincidence. This apparently has interesting influences on the heat and fluid flow patterns in this system. The paper aims to discuss these issues.Design/methodology/approach: In this work, several flow patterns have been investigated covering a wide range of Rayleigh number up to 108. Several thermal conductivity anisotropy scenarios of the central wall have been investigated including 0, 30, 60, 120 and 1501 principal anisotropy directions. The governing equations have been solved using control volume approach.Findings: Probably the most intriguing is that, for some anisotropy scenarios it is found that the temperature at the same elevation at the side of the central wall which is closer to the colder wall is higher than that at the side closer to the hot wall. Apparently this defies intuition which suggests the reverse to have happened. However, this behavior may be explained in light of the effect of anisotropy. Furthermore, the patterns of streamlines and temperature fields in the two enclosures also changes as a consequence of the change of the central wall temperatures for the different anisotropy scenarios.Originality/value: This work discusses a very interesting topic related to heat energy exchange among two compartments when the separating wall is anisotropic. In some anisotropy scenarios, this leads to more uniform distribution of Nusselt number than the case when the wall is isotropic. Interesting patterns of natural convection is investigated.en
dc.publisherEmeralden
dc.subjectAnisotropic thermal conductivityen
dc.subjectControl volume approachen
dc.subjectNatural convectionen
dc.subjectSquare cavitiesen
dc.titleNumerical investigation of natural convection in two enclosures separated by anisotropic solid wallen
dc.typeArticleen
dc.contributor.departmentComputational Transport Phenomena Laben
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentEarth Science and Engineering Programen
dc.identifier.journalInternational Journal of Numerical Methods for Heat & Fluid Flowen
kaust.authorSalama, Amgaden
kaust.authorEl-Amin, Mohameden
kaust.authorSun, Shuyuen
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