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Effect of Rotation on Detailed Heat Transfer Distribution for Various Rib Geometries in Developing Channel Flow

Identifieur interne : 003B28 ( PascalFrancis/Curation ); précédent : 003B27; suivant : 003B29

Effect of Rotation on Detailed Heat Transfer Distribution for Various Rib Geometries in Developing Channel Flow

Auteurs : Justin A. Lamont ; Srinath V. Ekkad [États-Unis] ; Mary Anne Alvin [États-Unis]

Source :

Journal of heat transfer [ 0022-1481 ] ; 2014.

RBID : Pascal:14-0138167

Descripteurs français

Pascal (Inist)
- Turbine gaz, Aube turbine, Tube nervuré, Etude expérimentale, Dispositif cristaux liquides, Installation essai, Transfert chaleur, Système refroidissement, Nombre Nusselt.

English descriptors

KwdEn :
- Cooling system, Experimental study, Gas turbine, Heat transfer, Liquid crystal devices, Nusselt number, Ribbed tube, Test facility, Turbine blade.

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 90deg, W, and M-shaped 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 M-shaped ribs are just as effective as the simple 90deg 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 M-shaped ribs show significant effect of rotation with large differences between leading and trailing side heat transfer.

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A11	`01`	`1`		`@1 LAMONT (Justin A.)`
A11	`02`	`1`		`@1 EKKAD (Srinath V.)`
A11	`03`	`1`		`@1 ALVIN (Mary Anne)`
A14	`01`			`@1 Department of Mechanical Engineering, Virginia Tech @2 Blacksburg, VA 24061 @3 USA @Z 2 aut.`
A14	`02`			`@1 DOE-National Energy Technology Laboratory @2 Pittsburgh, PA 15236 @3 USA @Z 3 aut.`
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C01	`01`		`ENG`	@0 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 90deg, W, and M-shaped 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 M-shaped ribs are just as effective as the simple 90deg 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 M-shaped ribs show significant effect of rotation with large differences between leading and trailing side heat transfer.
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C03	`01`	`X`	`ENG`	`@0 Gas turbine @5 08`
C03	`01`	`X`	`SPA`	`@0 Turbina gas @5 08`
C03	`02`	`X`	`FRE`	`@0 Aube turbine @5 09`
C03	`02`	`X`	`ENG`	`@0 Turbine blade @5 09`
C03	`02`	`X`	`SPA`	`@0 Paleta turbina @5 09`
C03	`03`	`X`	`FRE`	`@0 Tube nervuré @5 10`
C03	`03`	`X`	`ENG`	`@0 Ribbed tube @5 10`
C03	`03`	`X`	`SPA`	`@0 Tubo nervado @5 10`
C03	`04`	`X`	`FRE`	`@0 Etude expérimentale @5 15`
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C03	`04`	`X`	`SPA`	`@0 Estudio experimental @5 15`
C03	`05`	`3`	`FRE`	`@0 Dispositif cristaux liquides @5 17`
C03	`05`	`3`	`ENG`	`@0 Liquid crystal devices @5 17`
C03	`06`	`X`	`FRE`	`@0 Installation essai @5 18`
C03	`06`	`X`	`ENG`	`@0 Test facility @5 18`
C03	`06`	`X`	`SPA`	`@0 Instalación ensayo @5 18`
C03	`07`	`X`	`FRE`	`@0 Transfert chaleur @5 23`
C03	`07`	`X`	`ENG`	`@0 Heat transfer @5 23`
C03	`07`	`X`	`SPA`	`@0 Transferencia térmica @5 23`
C03	`08`	`X`	`FRE`	`@0 Système refroidissement @5 24`
C03	`08`	`X`	`ENG`	`@0 Cooling system @5 24`
C03	`08`	`X`	`SPA`	`@0 Sistema enfriamiento @5 24`
C03	`09`	`X`	`FRE`	`@0 Nombre Nusselt @5 25`
C03	`09`	`X`	`ENG`	`@0 Nusselt number @5 25`
C03	`09`	`X`	`SPA`	`@0 Número Nusselt @5 25`
N21				`@1 174`

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Le document en format XML

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<front><div type="abstract" xml:lang="en">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 90deg, W, and M-shaped 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 M-shaped ribs are just as effective as the simple 90deg 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 M-shaped ribs show significant effect of rotation with large differences between leading and trailing side heat transfer.</div>
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Effect of Rotation on Detailed Heat Transfer Distribution for Various Rib Geometries in Developing Channel Flow

Effect of Rotation on Detailed Heat Transfer Distribution for Various Rib Geometries in Developing Channel Flow

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