OP-II-3

PP-II-40TWO-ROTOR APPARATUSReznichenko S.O., Ratasep M.A., Verigin A.N., Kukushkin M.S., Lebedev S.N.Saint-Petersburg State Institute of Technology (Technical University),St. Petersburg, Russia, cbeta.p@mail.ruThe MAHP department of St. Petersburg Institute of Technology has developed ahighly efficient rotary apparatus with a multifactorial impact on working area.Interaction between the phases occurs in vigorous stirring gas-liquid layer with welldevelopedand rapidly updated interfacial surface under the field of centrifugal forces,along with a compulsory fluid flow from one stage to another.The apparatus consists of two rotors. The rotor consists of a thin shaft with a setof perforated disks fixed on it. The rotors are located in the "8" shaped cross sectionbody so, that the disks fixed on one rotor rotating between the disks of the other one.Rotors provide a discrete input of mass and energy of high density into theworking area. Perforation allows the gas bubble through the liquid. The acousticoscillations produced by the rotors dramatically speed up the heat&mass transfer atfrequencies close to the natural oscillations.The apparatus can operate in a continuous or periodic mode. In continuousmode, phases are fed countercurrently. The device has a low hydraulic resistanceand can operate over a wide range of loads on the liquid and gas.Hydraulic resistance of the apparatus can be calculated on the basis of twostreammodel, whereby the gas flow through the apparatus, can be regarded asconsisting of two independent parts: the flow going straight up through the perforateddisk and flow going along the zigzag channel.Hydraulic resistance of moistened disk can be regarded as one of the dry disk,but with reduced porosity, depending on wetting conditions.Experimentally it was shown that mass transfer in the apparatus can be welldescribed by the volumetric mass transfer coefficient k Vх :kVx⎛ heffcVh ⎟ ⎞= ⎜ε ,⎝ ⎠where h eff – effective gas-liquid layer height; h – contact stage height; ε v – energydissipation rate; c, n - constants.n406