低圧下における半周加熱円管内強制流動沸騰熱伝達と限界熱流束

概要

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Heat transfer for flow-boiling of water and Critical Heat Flux(CHF) experiments in the half-circumferentially heated round tube under low pressure condition were carried out. In order to clarify the flow patterns in the heated section the experiments in the round tube under the same condition were also carried out, and their results were compared. The experiments were conducted with atmospheric-pressure water in the test sections with inner diameter D=6mm, heated length L=360mm, inlet water subcooling △T_<in>=80K and mass velocity G from 0 to 2000kg/(m^2・S)for the half-circumferentially heated tube and from 0 to 7000kg/(m^2・S)for the full-circumferentially heated tube. The experiment data demonstrated that the wall temperature near the outlet of the half-circumferentially heated tube continued almost the same until CHF. And it was found that the burnout occurred when the flow regime changed from churn flow to annular flow, and the liquid film on the heated wall dried out nevertheless the liquid film on the unheated wall remained.
2000-08-25