ICONE11-36118 THERMAL ANALYSIS ON MONO-BLOCK TYPE DIVERTOR BASED ON SUBCOOLED FLOW BOILING CRITICAL HEAT FLUX DATA AGAINST INLET SUBCOOLING IN SHORT VERTICAL TUBE

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The subcooled flow boiling critical heat fluxes (CHFs) and the heat transfer coefficients (HTCs) data for L=49,99 and 149mm with 9-mm inner diameter were applied to thermal analysis on the Mono-block type divertor of LHD. Incident CHFs for the divertor with the cooling tube diameter, d, of 10mm and the carbon armor outer diameter, D, of 26 and 33mm were numerically analyzed based on the measured CHFs and HTCs at the inlet pressure of around 800 kPa. The numerical solutions were also compared with those for the Flat-plate type divertor, which were numerically analyzed for the divertor with the cooling tube diameter d=10mm and the divertor width, w, ranging from 16 to 30mm. It is confirmed that the ratio of the one-side heating CHF data, q_<cr, inc>, to the uniform heating CHF data, q_<cr, sub>, can be represented as the simple equation based on the numerical solutions. The values of the q_<cr, inc> for L=50,100 and 150mm were estimated with various D/d and w/d at higher pressures.
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