“…The available predictive correlations for the Sauter mean diameter are summarized in Table 4 below. From a practical perspective, the Sauter mean diameter (đť‘‘ ) model is more easily implemented if it is directly based on the fluid properties and flowing system conditions, rather than requiring additional measurements and/or correlations, such as those for liquid film thickness and entrained liquid mass flow in the models of Azzopardi et al (1980) [62], Azzopardi (1985) [6], Gibbons (1985) [47], Azzopardi et al (1989) [80], Ambrosini et al (1991) [81], Simmons and Hanratty (2001) [59], and Caraghiaur and Anglart (2013) [13]. While correlations exist to model the entrained liquid mass flow rate and liquid film thickness, applying one correlation on top of another can increase the overall uncertainty.…”