円管流路のサブクール流動沸騰における遷移沸騰特性(OS.16 明日に向けた熱工学の技術)

抄録

Subcooled flow boiling of water is performed in a horizontal circular channel with different diameters of 5mm, 10mm and 16mm. Microbubble emission boiling (MEB) occurs in transition boiling at above 20K of liquid subcooling and the heat flux increases higher than the ordinary critical heat flux. The liquid velocity gives strong effect on the heat flux increase in MEB. The maximum heat flux reaches 10 MW/m2 at 30K of liquid subcooling and 2.5m/s of liquid velocity. Periodic pressure fluctuations in the channels are observed in many cases of MEB. In the periodic MEB, heat fluxes increase in proportion to the frequency of the pressure fluctuations regardless of channel size, liquid subcooling and liquid velocity.