Experimental Study on Local Two Phase Distributions in ERVC Flow Channel

The two-phase flow distribution in the external reactor vessel cooling flow channel shows a significant local feature because of its particular flow structure. In this paper, a slice geometry test section and a 1:1 height scaling experimental apparatus is used to simulate the ERVC flow channel. Air is injected in the test section to simulate the two phase flow phenomena and conductivity probe is used to measure the local void fraction distribution. The test results show that the local void fraction transits from the wall peak distribution to the near-wall peak distribution, and eventually develops into the center peak distribution. The air flow rate has a significant effect on the local void fraction distribution in the flow channel.