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[Mainak Sarkar]

Is contacting time a parameter for determining height of the column? What are the other parameters for determining height of the column? In a bubble column reactor, what should be considered for calculating residence time/contacting time; Superficial velocity or velocity of the bubble at the mouth of distributer/purger? How the flow regime changes with velocity? Is superficial velocity is a parameter for determining column diameter? Is there any rule of thumb like L/D ratio? Does bubble size varies with surface tension of the fluid, if so how? Please help me?