The effect of unsteadiness on mixed convection boundary-layer stagnation-point flow over a vertical flat surface embedded in a porous medium
The unsteady mixed convection boundary-layer flow towards a stagnation point on a heated vertical surface embedded in a porous medium is considered. The governing partial differential equations are reduced to a system of nonlinear ordinary differential equations using a similarity transformation. Th...
| Main Authors: | , , , , |
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| Format: | Article |
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Elsevier
2014
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| Online Access: | http://psasir.upm.edu.my/id/eprint/35682/ |
| _version_ | 1848848122738900992 |
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| author | Rosali, Haliza Ishak, Anuar Nazar, Roslinda Merkin, John H. Pop, Ioan |
| author_facet | Rosali, Haliza Ishak, Anuar Nazar, Roslinda Merkin, John H. Pop, Ioan |
| author_sort | Rosali, Haliza |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The unsteady mixed convection boundary-layer flow towards a stagnation point on a heated vertical surface embedded in a porous medium is considered. The governing partial differential equations are reduced to a system of nonlinear ordinary differential equations using a similarity transformation. These are then solved numerically using the Keller-box method. These numerical results are complemented by asymptotic solutions for large values of A . The influence of dimensionless parameters λλ (mixed convection), A (time variation), n (wall temperature variation) on the flow field and heat transfer is analyzed and discussed, dual solutions being found for both assisting and opposing buoyant flows. |
| first_indexed | 2025-11-15T09:29:29Z |
| format | Article |
| id | upm-35682 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-15T09:29:29Z |
| publishDate | 2014 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-356822016-02-18T06:18:24Z http://psasir.upm.edu.my/id/eprint/35682/ The effect of unsteadiness on mixed convection boundary-layer stagnation-point flow over a vertical flat surface embedded in a porous medium Rosali, Haliza Ishak, Anuar Nazar, Roslinda Merkin, John H. Pop, Ioan The unsteady mixed convection boundary-layer flow towards a stagnation point on a heated vertical surface embedded in a porous medium is considered. The governing partial differential equations are reduced to a system of nonlinear ordinary differential equations using a similarity transformation. These are then solved numerically using the Keller-box method. These numerical results are complemented by asymptotic solutions for large values of A . The influence of dimensionless parameters λλ (mixed convection), A (time variation), n (wall temperature variation) on the flow field and heat transfer is analyzed and discussed, dual solutions being found for both assisting and opposing buoyant flows. Elsevier 2014-10 Article PeerReviewed Rosali, Haliza and Ishak, Anuar and Nazar, Roslinda and Merkin, John H. and Pop, Ioan (2014) The effect of unsteadiness on mixed convection boundary-layer stagnation-point flow over a vertical flat surface embedded in a porous medium. International Journal of Heat and Mass Transfer, 77. pp. 147-156. ISSN 0017-9310 http://www.sciencedirect.com/science/article/pii/S001793101400372X 10.1016/j.ijheatmasstransfer.2014.04.059 |
| spellingShingle | Rosali, Haliza Ishak, Anuar Nazar, Roslinda Merkin, John H. Pop, Ioan The effect of unsteadiness on mixed convection boundary-layer stagnation-point flow over a vertical flat surface embedded in a porous medium |
| title | The effect of unsteadiness on mixed convection boundary-layer stagnation-point flow over a vertical flat surface embedded in a porous medium |
| title_full | The effect of unsteadiness on mixed convection boundary-layer stagnation-point flow over a vertical flat surface embedded in a porous medium |
| title_fullStr | The effect of unsteadiness on mixed convection boundary-layer stagnation-point flow over a vertical flat surface embedded in a porous medium |
| title_full_unstemmed | The effect of unsteadiness on mixed convection boundary-layer stagnation-point flow over a vertical flat surface embedded in a porous medium |
| title_short | The effect of unsteadiness on mixed convection boundary-layer stagnation-point flow over a vertical flat surface embedded in a porous medium |
| title_sort | effect of unsteadiness on mixed convection boundary-layer stagnation-point flow over a vertical flat surface embedded in a porous medium |
| url | http://psasir.upm.edu.my/id/eprint/35682/ http://psasir.upm.edu.my/id/eprint/35682/ http://psasir.upm.edu.my/id/eprint/35682/ |