Experimental and Numerical Investigations on the Heat Transfer of Film Cooling With Cylindrical Holes Fed With Internal Coolant Cross FlowsSource: Journal of Heat Transfer:;2020:;volume( 142 ):;issue: 005DOI: 10.1115/1.4046441Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The heat transfer coefficient of cylindrical holes fed by varying internal cross-flow channels with different cross-flow Reynolds numbers Rec is experimentally studied on a low-speed flat-plate facility. Three coolant cross flow cases, including a smooth case and two ribbed cases with 45/135-deg ribs, are studied at Rec = 50,000, and 100,000 with varying blowing ratios M of 0.5, 1.0, and 2.0. A transient liquid-crystal (LC) measurement technique is used to determine the heat transfer coefficient. At lower M, the heat transfer enhancement regions are asymmetrical for the smooth and 45-deg cases. The asymmetrical vortex is more pronounced with increasing cross-flow direction velocity, resulting in a more skewed distribution at Rec = 100,000. Conversely, the contours are laterally symmetric in the 135-deg case at varying Rec. A fork-shaped trend with a relatively high heat transfer coefficient appears upstream, and the increases in the heat transfer in the 135-deg cases are lower than those in the 45-deg cases. As M increases to 2.0, the vortex intensity increases, resulting in a stronger scouring effect upstream, especially at large Rec. The range and degree are affected by Rec at M = 2.0. The core of the heat transfer enhancement is skewed to the −Y side for both cases.
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contributor author | Ye, Lin | |
contributor author | Liu, Cun-Liang | |
contributor author | Zhou, Dao-En | |
contributor author | Zhu, Hui-Ren | |
date accessioned | 2022-02-04T14:50:48Z | |
date available | 2022-02-04T14:50:48Z | |
date copyright | 2020/03/17/ | |
date issued | 2020 | |
identifier issn | 0022-1481 | |
identifier other | ht_142_05_052302.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4274505 | |
description abstract | The heat transfer coefficient of cylindrical holes fed by varying internal cross-flow channels with different cross-flow Reynolds numbers Rec is experimentally studied on a low-speed flat-plate facility. Three coolant cross flow cases, including a smooth case and two ribbed cases with 45/135-deg ribs, are studied at Rec = 50,000, and 100,000 with varying blowing ratios M of 0.5, 1.0, and 2.0. A transient liquid-crystal (LC) measurement technique is used to determine the heat transfer coefficient. At lower M, the heat transfer enhancement regions are asymmetrical for the smooth and 45-deg cases. The asymmetrical vortex is more pronounced with increasing cross-flow direction velocity, resulting in a more skewed distribution at Rec = 100,000. Conversely, the contours are laterally symmetric in the 135-deg case at varying Rec. A fork-shaped trend with a relatively high heat transfer coefficient appears upstream, and the increases in the heat transfer in the 135-deg cases are lower than those in the 45-deg cases. As M increases to 2.0, the vortex intensity increases, resulting in a stronger scouring effect upstream, especially at large Rec. The range and degree are affected by Rec at M = 2.0. The core of the heat transfer enhancement is skewed to the −Y side for both cases. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Experimental and Numerical Investigations on the Heat Transfer of Film Cooling With Cylindrical Holes Fed With Internal Coolant Cross Flows | |
type | Journal Paper | |
journal volume | 142 | |
journal issue | 5 | |
journal title | Journal of Heat Transfer | |
identifier doi | 10.1115/1.4046441 | |
page | 52302 | |
tree | Journal of Heat Transfer:;2020:;volume( 142 ):;issue: 005 | |
contenttype | Fulltext |