Buoyancy Driven Heat Transfer in Cavities Subjected to Thermal Boundary Conditions at Bottom Wall
Natural convection in cavities is studied numerically using a finite volume based computational procedure. The enclosure used for flow and heat transfer analysis has been bounded by adiabatic top wall, constant temperature cold vertical walls and a horizontal bottom wall. The bottom wall is subjec...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2012-01-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | http://jafmonline.net/JournalArchive/download?file_ID=15363&issue_ID=208 |
| _version_ | 1818755641422905344 |
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| author | b aswath C.J. Gangadhara Gowda S.N Sridhara K.N Seetharamu |
| author_facet | b aswath C.J. Gangadhara Gowda S.N Sridhara K.N Seetharamu |
| author_sort | b aswath |
| collection | DOAJ |
| description | Natural convection in cavities is studied numerically using a finite volume based computational procedure. The
enclosure used for flow and heat transfer analysis has been bounded by adiabatic top wall, constant temperature cold
vertical walls and a horizontal bottom wall. The bottom wall is subjected to uniform/sinusoidal/linearly varying
temperatures. Nusselt numbers are computed for Rayleigh numbers (Ra) ranging from 103 to 107 and aspect ratios
(H/L) 0.5 and 1. Air is taken as working fluid (Pr = 0.7). Results are presented in the form of stream lines, isotherm
plots and average Nusselt numbers. It is observed from this study that the uniform temperature at the bottom wall
gives higher Nusselt number compared to the sinusoidal and linearly varying temperature cases. The average Nusselt
number increases monotonically with Rayleigh number for both aspect ratio 1 and 0.5 for bottom wall and side walls.
For the case of aspect ratio 1, the average Nusselt number for a given Rayleigh number increases at the bottom wall
compared to aspect ratio 0.5. However, the average Nusselt number increases as the aspect ratio decreases from 1 to
0.5 for side wall except for uniform temperature case. |
| first_indexed | 2024-12-18T05:42:23Z |
| format | Article |
| id | doaj.art-a0ba5d499b6042f98ccd3248fd893457 |
| institution | Directory Open Access Journal |
| issn | 1735-3572 |
| language | English |
| last_indexed | 2024-12-18T05:42:23Z |
| publishDate | 2012-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-a0ba5d499b6042f98ccd3248fd8934572022-12-21T21:19:08ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35722012-01-01524353.Buoyancy Driven Heat Transfer in Cavities Subjected to Thermal Boundary Conditions at Bottom Wallb aswathC.J. Gangadhara GowdaS.N SridharaK.N SeetharamuNatural convection in cavities is studied numerically using a finite volume based computational procedure. The enclosure used for flow and heat transfer analysis has been bounded by adiabatic top wall, constant temperature cold vertical walls and a horizontal bottom wall. The bottom wall is subjected to uniform/sinusoidal/linearly varying temperatures. Nusselt numbers are computed for Rayleigh numbers (Ra) ranging from 103 to 107 and aspect ratios (H/L) 0.5 and 1. Air is taken as working fluid (Pr = 0.7). Results are presented in the form of stream lines, isotherm plots and average Nusselt numbers. It is observed from this study that the uniform temperature at the bottom wall gives higher Nusselt number compared to the sinusoidal and linearly varying temperature cases. The average Nusselt number increases monotonically with Rayleigh number for both aspect ratio 1 and 0.5 for bottom wall and side walls. For the case of aspect ratio 1, the average Nusselt number for a given Rayleigh number increases at the bottom wall compared to aspect ratio 0.5. However, the average Nusselt number increases as the aspect ratio decreases from 1 to 0.5 for side wall except for uniform temperature case.http://jafmonline.net/JournalArchive/download?file_ID=15363&issue_ID=208Natural convection Cavities Aspect ratio Thermal boundary conditions Numerical heat transfer |
| spellingShingle | b aswath C.J. Gangadhara Gowda S.N Sridhara K.N Seetharamu Buoyancy Driven Heat Transfer in Cavities Subjected to Thermal Boundary Conditions at Bottom Wall Journal of Applied Fluid Mechanics Natural convection Cavities Aspect ratio Thermal boundary conditions Numerical heat transfer |
| title | Buoyancy Driven Heat Transfer in Cavities Subjected to Thermal Boundary Conditions at Bottom Wall |
| title_full | Buoyancy Driven Heat Transfer in Cavities Subjected to Thermal Boundary Conditions at Bottom Wall |
| title_fullStr | Buoyancy Driven Heat Transfer in Cavities Subjected to Thermal Boundary Conditions at Bottom Wall |
| title_full_unstemmed | Buoyancy Driven Heat Transfer in Cavities Subjected to Thermal Boundary Conditions at Bottom Wall |
| title_short | Buoyancy Driven Heat Transfer in Cavities Subjected to Thermal Boundary Conditions at Bottom Wall |
| title_sort | buoyancy driven heat transfer in cavities subjected to thermal boundary conditions at bottom wall |
| topic | Natural convection Cavities Aspect ratio Thermal boundary conditions Numerical heat transfer |
| url | http://jafmonline.net/JournalArchive/download?file_ID=15363&issue_ID=208 |
| work_keys_str_mv | AT baswath buoyancydrivenheattransferincavitiessubjectedtothermalboundaryconditionsatbottomwall AT cjgangadharagowda buoyancydrivenheattransferincavitiessubjectedtothermalboundaryconditionsatbottomwall AT snsridhara buoyancydrivenheattransferincavitiessubjectedtothermalboundaryconditionsatbottomwall AT knseetharamu buoyancydrivenheattransferincavitiessubjectedtothermalboundaryconditionsatbottomwall |