LIQUID-PHASE CONTROLLED MASS-TRANSFER IN GAS-LIQUID SLUG FLOW AT LOW REYNOLDS-NUMBERS

A model of mass transfer during isothermal gas absorption from slugs rising in a channel filled with liquid at small Reynolds numbers is suggested. Fluid flow in the region below the bottom of gas slugs is assumed laminar and therefore vortex rings are not formed at the trailing edge of a gas slug. It is assumed also that a flow of dissolved gas can be described by a point source of mass which is located at the bottom of a gas slug. Intensity of this point source of mass at the bottom of the first gas slug emerging into a pure liquid is equal to the total mass flux from the surface of the first slug. The second gas slug emerges into a liquid with concentration distribution formed by a point source of mass at the bottom of the first gas slug. The third gas slug emerges in a liquid with a concentration distribution formed by a point source of mass at the bottom of the second gas slug and so on. Using this model a recurrent relation for mass flux from the n-th gas slug is derived and the total mass flux from n gas slugs in a gas-liquid slug flow is determined.