Bubble Characteristics in the Momentum Region of Air-Water Vertical Bubbling Jet.

The flow field in vertical bubbling jet in a cylindrica] vessel was found to be divided into four regions.They were named the momentum, transition, buoyancyand surface regions from the nozzle exit toward the bath surface, However, the bubble characteristics in each region have not been made clear even in air-water bubbling jets.The present paper proposed empirical correlations for bubble frequency and gas holdup in the momentum region of air-water vertical bubbling jet.The momentum region was defined as the region wherethe gas holdup on the centerli ne decreased from I OO to about I O '/•.Thesecorrelations were applicable to bubbling jets of the modified Froude numberfrom about unity to 2* I 0=.