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TECHNICAL BRIEFS

# 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

1

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

## Abstract

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 $w∕d$ 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 $w∕d$ at a higher pressure.

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## Figures

Figure 1

Typical photograph of the LHD divertor

Figure 2

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

Figure 3

Boundary fitted coordinates of the flat-plate-type divertor

Figure 4

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

Figure 5

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

Figure 6

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

Figure 7

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

Figure 8

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

Figure 9

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

Figure 10

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

Figure 11

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

Figure 12

A comparison of the experimental data with the numerical solution

## Errata

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