Effect of Rotation on Detailed Heat Transfer Distribution for Various Rib Geometries in Developing Channel FlowSource: Journal of Heat Transfer:;2014:;volume( 136 ):;issue: 001::page 11901DOI: 10.1115/1.4025211Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The effects of Coriolis force and centrifugal buoyancy have a significant impact on heat transfer behavior inside rotating internal serpentine coolant channels for turbine blades. Due to the complexity of added rotation inside such channels, detailed knowledge of the heat transfer will greatly enhance the blade designer's ability to predict hot spots so coolant may be distributed more effectively. The effects of high rotation numbers are investigated on the heat transfer distributions for different rib types in near entrance and entrance region of the channels. It is important to determine the actual enhancement derived from turbulating channel entrances where heat transfer is already high due to entrance effects and boundary layer growth. A transient liquid crystal technique is used to measure detailed heat transfer coefficients (htc) for a rotating, short length, radially outward coolant channel with rib turbulators. Different rib types such as 90 deg, W, and Mshaped ribs are used to roughen the walls to enhance heat transfer. The channel Reynolds number is held constant at 12,000 while the rotation number is increased up to 0.5. Results show that in the near entrance region, the high performance W and Mshaped ribs are just as effective as the simple 90 deg ribs in enhancing heat transfer. The entrance effect in the developing region causes significantly high baseline heat transfer coefficients thus reducing the effective of the ribs to further enhance heat transfer. Rotation causes increase in heat transfer on the trailing side, while the leading side remains relatively constant limiting the decrement in leading side heat transfer. For all rotational cases, the W and Mshaped ribs show significant effect of rotation with large differences between leading and trailing side heat transfer.
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contributor author | Lamont, Justin A. | |
contributor author | Ekkad, Srinath V. | |
contributor author | Anne Alvin, Mary | |
date accessioned | 2017-05-09T01:09:09Z | |
date available | 2017-05-09T01:09:09Z | |
date issued | 2014 | |
identifier issn | 0022-1481 | |
identifier other | ht_136_01_011901.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/155173 | |
description abstract | The effects of Coriolis force and centrifugal buoyancy have a significant impact on heat transfer behavior inside rotating internal serpentine coolant channels for turbine blades. Due to the complexity of added rotation inside such channels, detailed knowledge of the heat transfer will greatly enhance the blade designer's ability to predict hot spots so coolant may be distributed more effectively. The effects of high rotation numbers are investigated on the heat transfer distributions for different rib types in near entrance and entrance region of the channels. It is important to determine the actual enhancement derived from turbulating channel entrances where heat transfer is already high due to entrance effects and boundary layer growth. A transient liquid crystal technique is used to measure detailed heat transfer coefficients (htc) for a rotating, short length, radially outward coolant channel with rib turbulators. Different rib types such as 90 deg, W, and Mshaped ribs are used to roughen the walls to enhance heat transfer. The channel Reynolds number is held constant at 12,000 while the rotation number is increased up to 0.5. Results show that in the near entrance region, the high performance W and Mshaped ribs are just as effective as the simple 90 deg ribs in enhancing heat transfer. The entrance effect in the developing region causes significantly high baseline heat transfer coefficients thus reducing the effective of the ribs to further enhance heat transfer. Rotation causes increase in heat transfer on the trailing side, while the leading side remains relatively constant limiting the decrement in leading side heat transfer. For all rotational cases, the W and Mshaped ribs show significant effect of rotation with large differences between leading and trailing side heat transfer. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Effect of Rotation on Detailed Heat Transfer Distribution for Various Rib Geometries in Developing Channel Flow | |
type | Journal Paper | |
journal volume | 136 | |
journal issue | 1 | |
journal title | Journal of Heat Transfer | |
identifier doi | 10.1115/1.4025211 | |
journal fristpage | 11901 | |
journal lastpage | 11901 | |
identifier eissn | 1528-8943 | |
tree | Journal of Heat Transfer:;2014:;volume( 136 ):;issue: 001 | |
contenttype | Fulltext |