Microbubble Drag Reduction Downstream of Ventilated Partial CavitySource: Journal of Fluids Engineering:;2010:;volume( 132 ):;issue: 005::page 51302Author:Eduard Amromin
DOI: 10.1115/1.4001489Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The effect of air flux from ventilated partial cavities on drag of bodies was studied. An integral equation method for estimation of air bubble effects on drag was employed and validated with earlier known experimental data for flat plates and bodies. The qualitative difference in the effects of flow speed and air supply rate on drag of flat plates and bodies was numerically confirmed and explained as a combined effect of the boundary layer density decrease and the increase in its displacement thickness. The numerical analysis shows reduction in the total drag of ventilated bodies with increasing air flux rate up to an optimum, but the drag rise for greater rates. A synergy of friction reduction under attached ventilated cavity and microbubble drag reduction downstream of it was shown.
keyword(s): Flow (Dynamics) , Drag (Fluid dynamics) , Boundary layers , Cavities , Drag reduction , Flat plates , Friction , Thickness , Integral equations , Bubbles , Density AND Computation ,
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| contributor author | Eduard Amromin | |
| date accessioned | 2017-05-09T00:38:17Z | |
| date available | 2017-05-09T00:38:17Z | |
| date copyright | May, 2010 | |
| date issued | 2010 | |
| identifier issn | 0098-2202 | |
| identifier other | JFEGA4-27418#051302_1.pdf | |
| identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/143498 | |
| description abstract | The effect of air flux from ventilated partial cavities on drag of bodies was studied. An integral equation method for estimation of air bubble effects on drag was employed and validated with earlier known experimental data for flat plates and bodies. The qualitative difference in the effects of flow speed and air supply rate on drag of flat plates and bodies was numerically confirmed and explained as a combined effect of the boundary layer density decrease and the increase in its displacement thickness. The numerical analysis shows reduction in the total drag of ventilated bodies with increasing air flux rate up to an optimum, but the drag rise for greater rates. A synergy of friction reduction under attached ventilated cavity and microbubble drag reduction downstream of it was shown. | |
| publisher | The American Society of Mechanical Engineers (ASME) | |
| title | Microbubble Drag Reduction Downstream of Ventilated Partial Cavity | |
| type | Journal Paper | |
| journal volume | 132 | |
| journal issue | 5 | |
| journal title | Journal of Fluids Engineering | |
| identifier doi | 10.1115/1.4001489 | |
| journal fristpage | 51302 | |
| identifier eissn | 1528-901X | |
| keywords | Flow (Dynamics) | |
| keywords | Drag (Fluid dynamics) | |
| keywords | Boundary layers | |
| keywords | Cavities | |
| keywords | Drag reduction | |
| keywords | Flat plates | |
| keywords | Friction | |
| keywords | Thickness | |
| keywords | Integral equations | |
| keywords | Bubbles | |
| keywords | Density AND Computation | |
| tree | Journal of Fluids Engineering:;2010:;volume( 132 ):;issue: 005 | |
| contenttype | Fulltext |