油-水、乳-水体系开孔转盘塔流体力学性能的研究

本文通过油-水、乳-水体系对开孔转盘塔进行试验,研究了塔型、体系改变对分散相滞存率X、特性速度(?)及泛点操作转速n_(?)的影响.实验结果表明:(1)对给定的体系、塔型,操作转速不变时,两相流率、滞存率及特性速度可以用Logsdail提出的半经验式:进行关联;(2)低转速下操作RPDC可获得良好的液液分散效果;(3)最低切割转速n_(?)(在此转速下小孔能切割分散相液滴)可以用下式估算:

Hydrodynamics in Rotating Perforated Disk Contactors with Kerosine-Water and Emulsion-Water Systems

Hydrodynamics in rotating perforated disk contactors (RPDC) have been studied with kerosine-water and emulsion-water systems. The effects of the contactor dimension and the two phase systems on the fractional hold-up X and the characteristic velocity u as well as the rotor speed at flooding nt have been studied. The contactor dimension factors investigated are: (1) the diameter of stator ring opening, (2) the diameter of the disk and the hole distribution on it, and (3) the hole size. Experimental results indicate that: (1)for a given system, when contactor dimension and rotor speed remain unchanged, the phase flow rates, the holdup and the characteristic velocity can be correlated by the semi-empirical equation proposed by logsdial: u + ucx/(1 - x) =uox(1 - x) (2) at slow rotor speed, RPDC has good liquid-liquid dispersion performance, as the rotor peripheral speed was about 0.5m/s, (only 1/3 of the critical rotor peripheral speed of RDC), the change of the fractional hold-up x andthe characteristic velocity uo with the rotor speed n was very pere This is due to the fact that holes on the rotor disk have good cutting ef on the dispersed phase drops that are going up through the holes, (3)the minimum rotor speed under which the holes can cut the dispersed phase drops may be calculated as tollows: