[2J06-09] Gas-Liquid Two-Phase Flow 2

[2J08] Effects of Liquid Viscosity on Flow Characteristics in a Vertical Pipe 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, Liquid viscosity

The countercurrent flow limitation (CCFL), pressure gradient dP/dz, and void fraction α_G, by air and highly viscous liquid, were measured using a 40 mm diameter vertical pipe with rounded edges at the 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 correlation taking into account the liquid viscosity was developed for a vertical pipe with rounded edges at the top and bottom ends.