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Research Papers: Heat Transfer Enhancement

Heat Transfer in Rotating Multipass Rectangular Ribbed Channel With and Without a Turning Vane

[+] Author and Article Information
Jiang Lei

Xi'an Jiaotong University,
Xi'an, Shaanxi, 710049, China
e-mail: leijiang@mail.xjtu.edu

Je-Chin Han

e-mail: jc-han@tamu.edu
Texas A&M University,
College Station, TX 77843

Luzeng Zhang

e-mail: zhang_luzeng_j@solarturbines.com

Hee-Koo Moon

Solar Turbines Incorporated,
San Diego, CA 92101

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received April 26, 2012; final manuscript received November 18, 2012; published online March 20, 2013. Assoc. Editor: Frank Cunha.

J. Heat Transfer 135(4), 041903 (Mar 20, 2013) (10 pages) Paper No: HT-12-1195; doi: 10.1115/1.4023040 History: Received April 26, 2012; Revised November 18, 2012

This paper experimentally investigates the effect of a turning vane in hub region on heat transfer in a multipass rectangular channel with rib-roughed wall at high rotation numbers. The experimental data were taken in the second and the third passages (aspect ratio = 2:1) connected by an 180 deg U-bend. The flow was radial inward in the second passage and was radial outward after the 180 deg U-bend in the third passage. The square-edged ribs with P/e = 8, e/Dh = 0.1, and α = 45 deg were applied on the leading and trailing surfaces of the second and the third passages. Results showed that rotation increases heat transfer on the leading surface but decreases it on the trailing surface in the second passage. In the third passage, rotation decreases heat transfer on the leading surface but increases it on the trailing surface. Without a turning vane, rotation reduces heat transfer on the trailing surface and increases it on the leading surface in the hub 180 deg turn region. After adding a half-circle-shaped turning vane, heat transfer coefficients do not change in the second passage before-turn while they are different in the turn region and after-turn region in the third passage. Regional heat transfer coefficients are correlated with rotation numbers for multipass rectangular ribbed channel with and without a turning vane.

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Figures

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Fig. 1

Application of the test channel in turbine blade

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Fig. 2

Sketch of the test section inside the pressure vessel

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Fig. 3

Dimensions of the test section and the conceptual view of mainstream flow

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Fig. 4

Conceptual view of the secondary vortices induced by (a) rotation (upper β = 90 deg and lower β = 45 deg) and (b) 45 deg angle rib

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Fig. 5

Effect of conduction by turning vane on streamwise Nu ratio (Nu/Nuo) on LE and TE surfaces at β = 90 deg

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Fig. 6

(a) Rotation number and (b) buoyancy parameter at different Reynolds numbers and rotational speeds

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Fig. 7

Effect of turning vane on stationary streamwise Nu ratio (Nus/Nuo) distribution at Re = 20 k for (a) LE & TE and (b) side & inner

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Fig. 8

Effect of turning vane on streamwise Nu ratio (Nu/Nuo) distribution at Re = 20 k rpm = 400 (Ro = 0.2) and β = 90 deg for (a) LE & TE and (b) side & inner

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Fig. 9

Effect of channel orientation (β = 90 deg and 45 deg) on streamwise Nu ratio (Nu/Nuo) distribution at Re = 20 k rpm = 400 (Ro = 0.2) for (a) LE & TE and (b) side & inner

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Fig. 10

Nu/Nus versus Ro on all surfaces for β = 90 deg & 45 deg at regions #4 and #5 for cases (a) without vane and (b) with vane

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Fig. 11

Nu/Nus versus Ro on all surfaces for β = 90 deg & 45 deg at regions #6 and #7 for cases (a) without vane and (b) with vane

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Fig. 12

Nu/Nus versus Ro on all surfaces for β = 90 deg & 45 deg at regions #8 and #9 for cases (a) without vane and (b) with vane

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Fig. 13

Nu/Nus versus Ro on all surfaces for β = 90 deg & 45 deg at regions #10 and #11 for cases (a) without vane and (b) with vane

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