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The effect of hemispherical dimple spacing on flow structureand heat transfer characteristics of internal flow using CFD |
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| รหัสดีโอไอ | |
| Creator | 1. Ye Min Oo 2. Makatar Wae-hayee 3. Kamil Abdullah 4. Chayut Nuntadusit |
| Title | The effect of hemispherical dimple spacing on flow structureand heat transfer characteristics of internal flow using CFD |
| Publisher | Research and Development Office, Prince of Songkla University |
| Publication Year | 2562 |
| Journal Title | Songklanakarin Journal of Science and Technology |
| Journal Vol. | 41 |
| Journal No. | 5 |
| Page no. | 966-973 |
| Keyword | CFD, dimple, heat transfer, turbine blade cooling |
| URL Website | http://rdo.psu.ac.th/sjstweb/index.php |
| ISSN | 0125-3395 |
| Abstract | A simulation study of flow and heat transfer on a dimpled surface is presented. A 3-D model was tested in a wind tunnelwith rectangular cross section. A row of dimples with inline arrangement were formed on the internal wind tunnel surface, so that thecenterline of dimples was perpendicular to the air flow. The dimples were made with 40 mm diameter sphere, and the printed diameterof dimples on the surface was D=26.4 mm. The depth of a dimple was H=0.2D. The dimple-to-dimple spacings tested were S=1.125D,1.25D, 1.5D and 2D. The Reynolds number of internal flow, based on the hydraulic diameter of the wind tunnel, was 20,000. The fluidflow and heat transfer were numerically solved using a Shear Stress Transport (SST) k-? turbulence model. The results show that atS=1.125D, peak Nusselt numbers downstream of the dimples were found in two regions, whereas for cases with S?1.25D there was asingle such region. |
