E111 Characteristics of Heat Transfer and Critical Heat Flux of Flow Boiling in a Vertical Tube with a Wire Coil(Critical heat flux)

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The boiling heat transfer and the critical heat flux characteristics were experimentally investigated in a SUS316 vertical tube with a Teflon-coated wire coil of various wire diameters and pitches by using HCFC-123 as the working fluid. The tube wall was uniformly heated by a DC current. The experimental conditions were a mass flux G=200-400 kg/m^2s and a thermal equilibrium quality at the exit of the tube x_<cq>=0.1-0.8. The values of the boiling heat transfer coefficients in the tube with a wire coil were almost equal to those in a smooth tube in the nucleate boiling region, but a little enhancement of the heat transfer was observed in the forced convective evaporation region. The critical heat fluxes in the tube with a wire coil were larger than those in the smooth tube in the higher quality region.
一般社団法人日本機械学会の論文
2000-10-01