Natural Convection Heat and Mass Transfer in the Boundary Layer along a Vertical Cylinder with Opposing Buoyancies
The effects of opposing buoyancies on natural convection heat and mass transfer in the boundary layer over a vertical cylinder immersed in a quiescent Newtonian fluid are presented in this paper. The surface of the cylinder is maintained at a constant temperature and concentration. The homotopic t...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Isfahan University of Technology
2011-01-01
|
| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | http://jafmonline.net/JournalArchive/download?file_ID=15312&issue_ID=206 |
| _version_ | 1818757538676473856 |
|---|---|
| author | M. Si Abdallah B. Zeghmati |
| author_facet | M. Si Abdallah B. Zeghmati |
| author_sort | M. Si Abdallah |
| collection | DOAJ |
| description | The effects of opposing buoyancies on natural convection heat and mass transfer in the boundary layer over a vertical
cylinder immersed in a quiescent Newtonian fluid are presented in this paper. The surface of the cylinder is
maintained at a constant temperature and concentration. The homotopic transformation is proposed to transform the
physical domain into a flat plate. The boundary layer equations and the boundary conditions are solved numerically
using an implicit finite difference scheme and the Gauss-Seidel algorithm. The buoyancy ratio N, Prandtl number Pr
and Schmidt number Sc are important parameters for this problem. The numerical results for Pr=Sc and Pr≠ Sc,
including the velocity, temperature, concentration fields and the Nusselt number as well as the Sherwood number
along the surface of the cylinder are discussed for aiding and opposing buoyancies. Results show that the Nusselt
(Sherwood) number increases with positive or negative buoyancies ration N (N=Grc/Grt). Moreover, for opposing
flows with Sc<Pr , the flow is completely downward, the thickness of the concentration layer is larger than that of the
thermal layer . For Pr<Sc , the velocity are weak and the thermal layer thickness is much larger. |
| first_indexed | 2024-12-18T06:12:32Z |
| format | Article |
| id | doaj.art-26634c3d57154b5a88560e4a9734d6c1 |
| institution | Directory Open Access Journal |
| issn | 1735-3645 |
| language | English |
| last_indexed | 2024-12-18T06:12:32Z |
| publishDate | 2011-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-26634c3d57154b5a88560e4a9734d6c12022-12-21T21:18:22ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-36452011-01-01441521.Natural Convection Heat and Mass Transfer in the Boundary Layer along a Vertical Cylinder with Opposing BuoyanciesM. Si AbdallahB. ZeghmatiThe effects of opposing buoyancies on natural convection heat and mass transfer in the boundary layer over a vertical cylinder immersed in a quiescent Newtonian fluid are presented in this paper. The surface of the cylinder is maintained at a constant temperature and concentration. The homotopic transformation is proposed to transform the physical domain into a flat plate. The boundary layer equations and the boundary conditions are solved numerically using an implicit finite difference scheme and the Gauss-Seidel algorithm. The buoyancy ratio N, Prandtl number Pr and Schmidt number Sc are important parameters for this problem. The numerical results for Pr=Sc and Pr≠ Sc, including the velocity, temperature, concentration fields and the Nusselt number as well as the Sherwood number along the surface of the cylinder are discussed for aiding and opposing buoyancies. Results show that the Nusselt (Sherwood) number increases with positive or negative buoyancies ration N (N=Grc/Grt). Moreover, for opposing flows with Sc<Pr , the flow is completely downward, the thickness of the concentration layer is larger than that of the thermal layer . For Pr<Sc , the velocity are weak and the thermal layer thickness is much larger.http://jafmonline.net/JournalArchive/download?file_ID=15312&issue_ID=206Free convection Boundary layer Buoyancy force Vertical cylinder Heat transfer Mass transfer |
| spellingShingle | M. Si Abdallah B. Zeghmati Natural Convection Heat and Mass Transfer in the Boundary Layer along a Vertical Cylinder with Opposing Buoyancies Journal of Applied Fluid Mechanics Free convection Boundary layer Buoyancy force Vertical cylinder Heat transfer Mass transfer |
| title | Natural Convection Heat and Mass Transfer in the Boundary Layer along a Vertical Cylinder with Opposing Buoyancies |
| title_full | Natural Convection Heat and Mass Transfer in the Boundary Layer along a Vertical Cylinder with Opposing Buoyancies |
| title_fullStr | Natural Convection Heat and Mass Transfer in the Boundary Layer along a Vertical Cylinder with Opposing Buoyancies |
| title_full_unstemmed | Natural Convection Heat and Mass Transfer in the Boundary Layer along a Vertical Cylinder with Opposing Buoyancies |
| title_short | Natural Convection Heat and Mass Transfer in the Boundary Layer along a Vertical Cylinder with Opposing Buoyancies |
| title_sort | natural convection heat and mass transfer in the boundary layer along a vertical cylinder with opposing buoyancies |
| topic | Free convection Boundary layer Buoyancy force Vertical cylinder Heat transfer Mass transfer |
| url | http://jafmonline.net/JournalArchive/download?file_ID=15312&issue_ID=206 |
| work_keys_str_mv | AT msiabdallah naturalconvectionheatandmasstransferintheboundarylayeralongaverticalcylinderwithopposingbuoyancies AT bzeghmati naturalconvectionheatandmasstransferintheboundarylayeralongaverticalcylinderwithopposingbuoyancies |