Experimental Study of the Flow and Thermal Development of a Row of Cooling Jets Impinging on a Rotating Concave SurfaceSource: Journal of Turbomachinery:;2005:;volume( 127 ):;issue: 001::page 222DOI: 10.1115/1.1812778Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The paper reports an experimental study of impingement cooling in a rotating passage of semi-cylindrical cross section. Cooling fluid is injected from a row of five jet holes along the centerline of the flat surface of the passage and strikes the concave surface. The cooling passage rotates orthogonally about an axis parallel to that of the jets. Tests have been carried out, using water, both within the passage and as the jet fluid, at a fixed Reynolds number of 15,000, for clockwise and counter-clockwise rotation. Local Nusselt number measurements, using the liquid-crystal technique, show that under stationary conditions a high Nusselt number region develops around each impingement point, with secondary peaks half-way between impingement points. Rotation reduces heat transfer, leads to the disappearance of all secondary peaks and also, surprisingly, of some of the primary peaks. Flow visualization tests suggest that these changes in thermal behavior are caused because rotation increases the spreading rate of the jets. LDA and PIV measurements are also presented. They show that under stationary conditions the five jets exhibit a similar behavior, with their cores remaining intact up to the point of impingement at the top dead center. The LDA and PIV studies help explain the rather surprising thermal behavior under rotating conditions.
keyword(s): Rotation , Flow (Dynamics) , Heat transfer , Cooling , Measurement , Jets , Flow visualization , Fluids AND Impingement cooling ,
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contributor author | Hector Iacovides | |
contributor author | Jiankang Li | |
contributor author | Zeyuan Xu | |
contributor author | Diamantis Kounadis | |
contributor author | Brian E. Launder | |
date accessioned | 2017-05-09T00:18:18Z | |
date available | 2017-05-09T00:18:18Z | |
date copyright | January, 2005 | |
date issued | 2005 | |
identifier issn | 0889-504X | |
identifier other | JOTUEI-28717#222_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/132855 | |
description abstract | The paper reports an experimental study of impingement cooling in a rotating passage of semi-cylindrical cross section. Cooling fluid is injected from a row of five jet holes along the centerline of the flat surface of the passage and strikes the concave surface. The cooling passage rotates orthogonally about an axis parallel to that of the jets. Tests have been carried out, using water, both within the passage and as the jet fluid, at a fixed Reynolds number of 15,000, for clockwise and counter-clockwise rotation. Local Nusselt number measurements, using the liquid-crystal technique, show that under stationary conditions a high Nusselt number region develops around each impingement point, with secondary peaks half-way between impingement points. Rotation reduces heat transfer, leads to the disappearance of all secondary peaks and also, surprisingly, of some of the primary peaks. Flow visualization tests suggest that these changes in thermal behavior are caused because rotation increases the spreading rate of the jets. LDA and PIV measurements are also presented. They show that under stationary conditions the five jets exhibit a similar behavior, with their cores remaining intact up to the point of impingement at the top dead center. The LDA and PIV studies help explain the rather surprising thermal behavior under rotating conditions. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Experimental Study of the Flow and Thermal Development of a Row of Cooling Jets Impinging on a Rotating Concave Surface | |
type | Journal Paper | |
journal volume | 127 | |
journal issue | 1 | |
journal title | Journal of Turbomachinery | |
identifier doi | 10.1115/1.1812778 | |
journal fristpage | 222 | |
journal lastpage | 229 | |
identifier eissn | 1528-8900 | |
keywords | Rotation | |
keywords | Flow (Dynamics) | |
keywords | Heat transfer | |
keywords | Cooling | |
keywords | Measurement | |
keywords | Jets | |
keywords | Flow visualization | |
keywords | Fluids AND Impingement cooling | |
tree | Journal of Turbomachinery:;2005:;volume( 127 ):;issue: 001 | |
contenttype | Fulltext |