[2L10-15] Gas-liquid Two Phase Flow 1

[2L14] Flow Characteristics in a Vertical Pipe with Sharp-Edged Top and Bottom Ends under Flooding Conditions

*Toshiya Takaki¹, Michio Murase¹, Masaki Yamashita², Ryo Kurimoto², Kosuke Hayashi², Akio Tomiyama² (1. INSS, 2. Kobe Univ.)

Keywords:Vertical pipe, Countercurrent flow limitation, Void fraction, Wall friction factor, Interfacial friction factor

The countercurrent flow limitation (CCFL), pressure gradient dP/dz, and void fraction α_G were measured using a 40 mm diameter vertical pipe with sharp-edged top and bottom ends, the wall friction factor f_w and interface friction factor f_i were obtained from the data, and they were compared with the existing correlations. The CCFL characteristics were expressed by the minimum value obtained from CCFL correlations for flooding at the top and bottom ends.