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TECHNICAL PAPERS

Fluid Flow and Heat Transfer in Two-Pass Smooth Rectangular Channels With Different Turn Clearances

[+] Author and Article Information
Hiroshi Nakayama

 Daido Institute of Technology, Minami-ku, Nagoya, 457-8530, Japanhnaka@daido-it.ac.jp

Masafumi Hirota

Department of Micro-Nano System Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japanhirota@mech.nagoya-u.ac.jp

Hideomi Fujita

Department of Mechanical Engineering, Meijo University, Tenpaku-ku, Nagoya 468-8502, Japanhdfujita@ccmfs.meijo-u.ac.jp

Takeshi Yamada

 Akashi Works, Kawasaki Heavy Industries, Kawasaki-cho, Akashi 673-8666, Japanyamada_take@khi.co.jp

Yusuke Koide

 Tokai Works, Du pont-Toray, Shinpo-cho, Tokai 476-8567, Japanyusuke_koide@td-net.co.jp

J. Turbomach 128(4), 772-785 (May 02, 2005) (14 pages) doi:10.1115/1.2101854 History: Received May 10, 2004; Revised May 02, 2005

Flow characteristics in stationary two-pass channels with a sharp 180-deg turn have been measured using LDV (laser Doppler velocimeter), directing special attention to the influence of the size of the turn clearance on the flow structure. The main features of the flow, flow separation and recirculation, secondary flow, turbulence intensities, measured with Re=3.5×104 for three turn clearances, are presented. A close comparison of the velocity data with local Sherwood number distributions on the channel walls reveals that the wall-normal velocity mainly dominates the heat transfer in the channel, but the wall-parallel component also contributes locally to heat transfer after the turn.

Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of the experimental apparatus

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Figure 2

Details of the test channel and coordinate system

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Figure 3

Measurement cross sections normal to the streamwise axis

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Figure 4

Entrance configuration of the channel

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Figure 5

Velocity distributions before the turn (Z*=0 plane at X*=−3)

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Figure 6

Mean velocity vector diagram. (a) C*=1.4; (b) C*=1.0; (c) C*=0.6.

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Figure 7

Magnified vector diagram at the first outer corner (Z*=0); (a) C*=1.4; (b) C*=1.0; (c) C*=0.6

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Figure 8

Magnified velocity vectors near divider wall tip (C*=1)

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Figure 9

Contour map of ψ(Z*=0); (a) C*=1.4; (b) C*=1.0; (c) C*=0.6

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Figure 10

Flow characteristics after the turn (Z*=0). (a) Primary flow velocity U∕Ub; (b) secondary flow velocity V∕Ub; (c) turbulent kinetic energy k∕Ub2.

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Figure 11

Secondary flow vectors (upper half) and primary flow velocity U∕Ub (V∕Ub in section 1) (lower half). (a) C*=1.4; (b) C*=1.0; (c) C*=0.6.

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Figure 12

Magnitude of secondary flow velocity at various X* position of second flow pass

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Figure 13

Contour maps of turbulent kinetic energy k∕Ub2 (upper half) and streamwise velocity fluctuation u′∕Ub (v′∕Ub in section 1) (lower half). (a) C*=1.4; (b) C*=1.0; (c) C*=0.6.

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Figure 14

Contour maps of spanwise velocity fluctuation v′∕Ub (u′∕Ub in section 1) (upper half) and transverse velocity fluctuation w′∕Ub (lower half). (a) C*=1.4; (b) C*=1.0; (c) C*=0.6.

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Figure 15

Distributions of Sh and near-wall flow parameters on the end wall (Z*=0). (a) Sh∕Sh0; (b) streamwise mean velocity V∕Ub; (c) streamwise velocity fluctuation v′∕Ub; (d) wall-normal mean velocity U∕Ub; (e) wall-normal velocity fluctuation u′∕Ub.

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Figure 16

Distributions of Sh and near-wall flow parameters on the divider wall after the turn (Z*=0). (a) Sh∕Sh0; (b) streamwise mean velocity U∕Ub; (c) streamwise velocity fluctuation u′∕Ub; (d) wall-normal mean velocity V∕Ub; (e) wall-normal velocity fluctuation v′∕Ub.

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Figure 17

Distributions of Sh and near-wall flow parameters on the outer wall after the turn (Z*=0). (a) Sh∕Sh0; (b) streamwise mean velocity U∕Ub; (c) streamwise velocity fluctuation u′∕Ub; (d) wall-normal mean velocity V∕Ub; (e) wall-normal velocity fluctuation v′∕Ub.

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