Thermal Analysis on Flat-Plate-Type Divertor Based on Subcooled Flow Boiling Critical Heat Flux Data Against Inlet Subcooling in Short Vertical Tube

[+] Author and Article Information
Koichi Hata1

 Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japanhata@iae.kyoto-u.ac.jp

Nobuaki Noda

 National Institute for Fusion Science, 322-6, Oroshi-cho, Toki, Gifu 509-5292, Japan


Author to whom all correspondence should be addressed. Tel & Fax: +81-774-38-3473.

J. Heat Transfer 128(3), 311-317 (Aug 24, 2005) (7 pages) doi:10.1115/1.2150842 History: Received July 03, 2004; Revised August 24, 2005

The critical heat fluxes (CHFs) and the heat transfer coefficients (HTCs) in subcooled flow boiling were applied to a thermal analysis of the flat-plate-type divertor of a helical-type fusion experimental device, which is a Large Helical Device (LHD) located in the National Institute for Fusion Science (NIFS), Japan. The incident CHF, qcr,inc, for the divertor plate with the cooling tube diameter, d, of 10mm and the plate width, w, ranging from 16 to 30mm were numerically analyzed based on the measured CHFs, qcr,sub, and HTCs for the test tube inner diameter, d, of 9mm and the heated length, L, of 48 to 149mm. The peripheral distributions of the surface heat flux and the surface temperature in the cooling tube were obtained. Numerical solutions of qcr,inc become larger with a decrease in wd at a fixed L. It is confirmed that the ratio of the one-side heat loading data, qcr,inc, to the uniform heat loading data, qcr,sub, can be represented as the simple equation based on the numerical solutions. The values of the qcr,inc for the tube length of 50, 100, and 150mm were estimated with various wd at a higher pressure.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Typical photograph of the LHD divertor

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Figure 2

Cross-sectional views of LHD divertors; (a) flat-plate type and (b) mono-block type

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Figure 3

Boundary fitted coordinates of the flat-plate-type divertor

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Figure 4

Relationship between q and (Ts−Tin) for d=9mm with L=48mm at an inlet pressure of 594kPa

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Figure 5

Time variations in Twall, TCX, and TCu for qinc=10.8MW∕m2 with d=10mm and L=48mm

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Figure 6

Peripheral distribution of qθ, Ts−Tin, and Twall for qinc=10.8MW∕m2

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Figure 7

Time variations in Twall, TCX, and TCu for qinc=11.6MW∕m2 with d=10mm and L=48mm

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Figure 8

Relationship between qinc and w∕d at a cooling tube inner diameter of 10mm

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Figure 9

Relationship between qinc∕qcr,sub and w∕d for a flat-plate-type divertor

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Figure 10

Relationship between qcr,inc and w∕d at Pin=0.5–2MPa

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Figure 11

Time variations in Twall, TCX, and TCu for qinc=10.8MW∕m2 in the heat load test (Kubota (15-16))

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Figure 12

A comparison of the experimental data with the numerical solution



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