In a two-phase system where the continuous phase remains in place, the gas hold up can be expressed as (where Vs and Vt are the superficial gas velocity and bubble rise velocity)

H = Vs/(Vs-Vt)
 
H = Vs/(Vs+ Vt)
 
H = Vs/(Vs.Vt)
 
H = (Vs+Vt)/Vs
 

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