S0802-2-3 垂直上昇環状流の液膜破断に及ぼす壁面濡れ性の影響(原子力システムおよび要素技術(2))

概要

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To evaluate the effect of wall surface wettability on liquid film dryout mechanism of upward gas-liquid annular mist flow in a vertical pipe, an experimental study was performed using two test pipes: an acrylic pipe and a FEP pipe. Measured contact angles on the acrylic and FEP pipe surfaces were 60° and 80°, respectively. Flow observation and measurement of liquid film flow rate were respectively conducted by using a high speed video camera and a liquid film extraction method. In the acrylic pipe, once dryout occurred the dry part quickly spread and the liquid flowed up as liquid rivulets on the pipe wall. In the FEP pipe, dryout occurred in ripple region formed between disturbance waves and rewetting the dry part on the wall after the disturbance wave passed was confirmed. The liquid film flow rate near dryout condition in the FEP pipe was 7-42 times larger than that in the acrylic pipe in the tested flow conditions.
2010-09-04