2124 導電プローブと静電容量プローブによるプール沸騰伝熱面近傍の気液挙動測定  [in Japanese] Measurement of Liquid-Vapor Behavior near Heating Surface in Pool Boiling using Conductance Probe and Capacitance Probe  [in Japanese]

A conductance probe method and a capacitance probe method were developed to measure liquid-vapor behavior in the vicinity of boiling surface with high accuracy. With the conductance probe, liquid macrolayer thicknesses formed beneath the large coalesced bubbles were measured for water boiling on an upward-facing surface in the range of subcooling 0K to 30K. The macrolayer in subcooled boiling was considerably thicker than that of saturated boiling, and this is most likely to be the cause that the CHF increases with the increase in subcooling. The capacitance probe method was applied to measure the primary bubble behavior in subcooled boiling. It was found that this method has high sensitivity enough to detect the bubble cycle from generation to collapse that terminates within 0.1msec. or less.