The characterizationsofvariousflowregimeswereinvestigated
in theHTLBbychangingthegasandliquidflowrates.Theobserved
flow patternsaredepictedin Fig. 9. Asisobvious,thebubbly(ho-
mogeneous) flowregimewascharacterizedbyalmostuniformsized
bubbles withequalradialdistributionatliquidflowratesmorethan
0.2m/s.Theheterogeneousflow(slugandwavy)weredetermined
by largebubblesmovingathighgasvelocities(morethan0.03m/s)
in thepresenceofsmallbubbles.Moreover,theplugflowoccurred
when gasflowratedidnotexceed0.03m/sandthevalueofliquidve-
locity wasbetween0.1and0.4m/s.