Flow structure of gas–liquid two-phase flow in an annulus

Interfacial area concentration in gas–liquid bubbly to churn-turbulent flow regime

“…Hibiki and Ishii (2002) derived a semitheoretical formulation from the interfacial area transport equation to predict the IAC in bubbly columns and forced convective bubbly flows. Ozar et al (2008) demonstrated that this correlation can be used with Ishii and Mishima's (1980) formulation for cap-bubbly and slug flow if the bubble fraction in the liquid slug is provided accurately.…”

“…steam-water, air-water, air-isopropanol solution, etc.). The experimental existing databases particular to IAC measurements have been provided extensively by Ishii (2001, 2002), Hibiki et al (2006) and Ozar et al (2008). Among the work presented in these publications, Akita and Yoshida (1974), Liu (1989), Serizawa et al (1991), Roy et al (1994) and Yun et al (2008) provide a valuable experimental database for different flow geometries and wide conditions.…”

Two-group drift-flux model for closure of the modified two-fluid model

“…The value of C 1 represents the geometric effect of the flow channel and is 1.2 or 1.35 for pipes or rectangular channels, respectively (Ishii, 1977). For flow in an annulus, a C 1 value of 1.1 should be utilized (Ozar et al, 2008a) while Julia et al (2009) study of flow in a bundle geometry gives a range of 1.03-1.05 depending on the ratio of rod diameter to pitch distance. The effects of bubble size in bubbly flow were studied by Hibiki and Ishii (2002) and modified Eq.…”

Heat transfer of bubbly flow on inner wall of annular channel

“…Despite a rather large number of studies, a number of questions are still open even for a single-phase flow. Studies of the local structure of the two-phase gas-liquid flow, and especially heat transfer in such flows, are very limited in the literature [1][2][3][4][5][6].…”