(94f) Pressure Drop on Gas Tangential Velocity in Rotating Zigzag Bed

     The pressure drop across Higee is one of the most important characteristics, and the liquid flow gives rise to intriguing and unusual effects on the pressure drop. The pressure drop of the wet Higee can be substantially lower than that of the dry one. This trend is quite different from the conventional packed and trayed tower. And the unusual effects also occur in the rotating zigzag bed(RZB) as a novel type of Higee. The pressure drop of RZB was studied using two methods of pressure drop model based on the gas tangential velocity and empirical correlation. Experiments were carried out in a RZB of 214mm inner-diameter, 486mm outer-diameter and 104mm axial-height rotor with air-water system. The radial distribution of gas tangential velocity in the RZB rotor was obtained. And the liquid flow reduces the gas tangential velocity. The gas tangential velocity was correlated by an empirical equation, on which the centrifugal pressure drop is predicted by the pressure drop model. Thereby, the frictional and momentum pressure drop are also predicted by the model. As a result, the phenomenon that the wet rotor pressure drop is lower than the dry rotor pressure drop is reasonably explained. The variation of the overall pressure drop of RZB is similar to that of the rotor pressure drop, and it is correlated by an empirical equation with good agreement.