Verification of detailed two-phase flow simulation code TPFIT to water jet experiment

Yoshida, Hiroyuki  ; Suzuki, Takayuki*; Takase, Kazuyuki; Koizumi, Yasuo*

In this study, the detailed two-phase flow simulation code TPFIT developed in the JAEA was applied to the water jet experiment as a first step of the validation work of the TPFIT for annular and dispersed flow. The liquid film that flowed on the fuel rod surface under the annular two-phase flow condition was imitated as the water jet. In the experiment, water gushed out downward from the nozzle to the atmosphere, and the water jet shapes were observed by a high-speed camera. Results of the detailed numerical simulation of the TPFIT were compared with the measured data including water jet shapes, water jet collapse length and length of water jet surface wave. In the results, the TPFIT could predict length of water jet surface wave. However, the predicted collapse length did not agree with the measured values. It is concluded that the evaluation method of surface tension force must be modified to improve accuracy of numerical simulations.