Studies of two-phase flow through a sudden expansion using electrical capacitance tomography

Pressure recovery model for gas–liquid two-phase flow across sudden expansions

“…Compared to straight pipes, few studies have investigated the influence of sudden expansions on gas-liquid two-phase flows. Some of these works was devoted to the study of the fitting's influence on the flow pattern (Yang et al, 2001;Kondo et al, 2002;Ahmed et al, 2007Ahmed et al, , 2008Arabi et al, 2018Arabi et al, , 2021bZhang and Goharzadeh, 2019;Roman et al, 2020) or on the hydrodynamic flow parameters (Aloui and Souhar, 1996a;Arabi et al, 2018Arabi et al, , 2021bLiang et al, 2022). Some authors were interested in the behavior of a specific flow regime through the sudden expansions.…”

“…Thus, the downstream region close to the singularity exhibits recirculation zones (Salhi, 2010, Roul andDash, 2011). The latter lead to a redistribution of the void fraction (Ahmed, 2007;Roman et al, 2020;Liang et al, 2022) and a modification of the flow regime or sub-regime downstream the singularity (Attou et al, 2000;Kondo et al, 2002;Arabi et al, 2018Arabi et al, , 2021bZhang and Goharzadeh, 2019). The hydrodynamics parameters (Aloui and Souhar, 1996b;Ahmed et al, 2008;Rosero et al, 2021) as well as the heat transfer characteristics (Lobanov et al, 2019;Chinak et al, 2019), in the case of non-isothermal flows, are also disturbed.…”