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Research Papers

Three-Dimensional Visualization of Flow Characteristics Using a Magnetic Resonance Imaging in a Lattice Cooling Channel

[+] Author and Article Information
Tomoko Tsuru

Kawasaki Heavy Industries, Ltd.,
1-1 Kawasaki,
Akashi 673-8666, Hyogo, Japan
e-mail: tsuru_t@khi.co.jp

Katsuhiko Ishida

Kawasaki Heavy Industries, Ltd.,
1-1 Kawasaki,
Akashi 673-8666, Hyogo, Japan
e-mail: ishida_katsuhiko@khi.co.jp

Junya Fujita

Tokushima Bunri University,
1314-1 Shido,
Sanuki 769-2193, Kagawa, Japan
e-mail: amadeus.jf.1994@gmail.com

Kenichiro Takeishi

Mem. ASME
Professor,
Tokushima Bunri University,
1314-1 Shido,
Sanuki 769-2193, Kagawa, Japan
e-mail: takeishi@fst.bunri-u.ac.jp

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received September 7, 2018; final manuscript received October 12, 2018; published online January 21, 2019. Editor: Kenneth Hall.

J. Turbomach 141(6), 061003 (Jan 21, 2019) (10 pages) Paper No: TURBO-18-1237; doi: 10.1115/1.4041908 History: Received September 07, 2018; Revised October 12, 2018

Flow structures in lattice cooling channels are investigated experimentally by measuring three-dimensional (3D) velocity components over entire duct. The lattice cooling structure is formed by crossing two sets of parallel inclined ribs. Heat transfer is enhanced when coolant flows through the narrow subchannels between the ribs. According to the past literature, longitudinal vortex structures are formed inside the subchannels due to interactions between crossing flows. In this study, 3D velocity field measurement is performed using magnetic resonance imaging (MRI) scanner to clarify the flow mechanism. The rib inclination angle is varied from 30 to 60 deg. Reynolds number is set at approximately 8000 based on the whole duct inlet hydraulic diameter and bulk velocity. Working fluid is 0.015 mol/L copper sulfate aqueous solution. Measured results show that coolants in the upper and lower subchannels interact not only at the both ends of the duct, but also at diamond-shaped openings formed by opposite subchannels. The exchange of momentum between the upper and lower subchannels occurs at the openings, leading to sustained longitudinal vortex in each subchannel as mentioned in the literature. When the ribs are arranged with obtuse angle, a large vortex spreads across the contact surface, while the vortex structure independently stays in each subchannel for acute rib angle. The measured velocity fields are compared with numerically-simulated ones using a Reynolds-averaged Navier-Stokes (RANS) solver. Overall flow pattern is captured, but flow interaction between the upper and lower subchannels is underestimated.

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Figures

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Fig. 1

Schematic of lattice channel flow network [13]

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Fig. 2

Flow diagram of the experimental apparatus [22]

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Fig. 4

Typical streamlines of coolant

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Fig. 5

Measured velocity magnitude distributions with projected vectors in the upper subchannels for β = 45 deg (coolant enters into each subchannel from the bottom): (a) z/Hs = 0, (b) z/Hs = 0.1, (c) z/Hs = 0.2, (d) z/Hs = 0.3, (e) z/Hs = 0.4, (f) z/Hs = 0.5, (g) z/Hs = 0.6, (h) z/Hs = 0.7, (i) z/Hs = 0.8, and (j) z/Hs = 0.9

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Fig. 6

Measured z-directional velocity distribution across the contact surfaces

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Fig. 7

Predicted z-directional velocity distribution across the contact surfaces

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Fig. 8

Predicted velocity magnitude distributions with projected vectors in the upper subchannels for β = 45 deg (coolant enters into each subchannel from the bottom): (a) z/Hs = 0, (b) z/Hs = 0.1, (c) z/Hs = 0.2, (d) z/Hs = 0.3, (e) z/Hs = 0.4, (f) z/Hs = 0.5, (g) z/Hs = 0.6, (h) z/Hs = 0.7, (i) z/Hs = 0.8, and (j) z/Hs = 0.9

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Fig. 9

Comparison of velocity distribution with projected vectors on A-A′ plane (a) experiment and (b) CFD

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Fig. 10

Comparison of measured velocity distribution in the subchannels (z/Hs = 0.5): (a)β = 30 deg, (b) β = 45 deg, and (c) β = 60 deg

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Fig. 11

Flow Interaction across the contact surfaces for β = 60 deg on A-A′ plane: (a) experiment and (b) CFD

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Fig. 12

Comparison of measured z-directional velocity distribution (z/Hs = 0): (a) β = 30 deg, (b) β = 45 deg, and (c) β = 60 deg

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Fig. 13

Comparison of predicted velocity distribution in the sub-channels (z/Hs = 0.5): (a)β = 30 deg, (b) β = 45 deg, and (c) β = 60 deg

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Fig. 14

Comparison of predicted z-directional velocity distribution (z/Hs = 0): (a) β = 30 deg, (b) β = 45 deg, and (c) β = 60 deg

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Fig. 15

Distributions of predicted x-component of vorticity vectors with projected velocity vectors: (a) β = 30 deg, (b) β = 45 deg, and (c) β = 60 deg

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