Bo Bond number
Df father-bubble diameter (m)
Dm mother-bubble diameter (m)
Ds satellite bubble diameter (m)
Dsa average of satellite bubble diameter (m)
g acceleration due to gravity (m/s2)
Lb capillary length (m)
Ohm Ohnesorge number
Q gas flow rate (m3/s)
R0 inner radius of tube (m)
Rm mother-bubble radius (m)
t time (s)
T father-bubble cycle period (s)
tp partial coalescence time (s)
u average gas injection speed (m/s)
We Weber number
Greek letters Greek letters
μ Liquid dynamic viscosity (Pa s)
ρ density (kg/m3)
σ surface tension coefficient (N/m)
τσ capillary inertial time (s)