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| Titel: |
Flow Visualization and Local Mass Transfer Studies for Turbulent Flow in a Wind Tunnel with Chamfered Ribs |
| Auteur: |
Karwa, Rajendra Maheshwari, B.K. Karwa, Nitin |
| Verschenen in: |
Journal of visualization |
| Paginering: | Jaargang 11 (2008) nr. 3 pagina's 205-212 |
| Jaar: |
2008-09-12 |
| Inhoud: |
The paper presents results of flow visualization and mass transfer studies for fully developed turbulent flow of air in a square section wind tunnel with repeated chamfered rib roughness on the bottom of the tunnel (rib head chamfer angles ϕ of −15°, 0°, and 15°; relative roughness pitch p/ e = 3, 5, 7.5, and 10). Direct video recordings of flow patterns were made using a simple technique of particles visualization. For the positively chamfered closely spaced ribs (p/ e ⩽ 5) vigorous vortex shedding has been seen compared to the square or negatively chamfered ribs, which is found to be a function of the Reynolds number. For the widely spaced ribs, the study shows flow separation at the ribs and reattachment in the inter-rib region. Local mass transfer studies, based on the variation in colour of cobaltous chloride solution impregnated paper due to evaporation of water, showed a significant improvement in mass transfer rate in the recirculating region in the wake of ribs with the change in the chamfer angle from −15° to 15°. The positively chamfered 15° ribs are found to be better than square section ribs at p/ e ⩽ 7.5. The performance of negatively chamfered ribs is found to be poor compared to other ribs irrespective of the relative roughness pitch. |
| Uitgever: |
IOS Press |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 30 gevonden artikelen
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