1990 Volume 16 Issue 1 Pages 152-159
A high flux rate of dynamic filtration is attained by producing, in a filter chamber, a liquid velocity high enough for sweeping a filter cake from the medium completely. Measurements were made of the tangential velocity distributions as sociated with a rotating ungrooved disk enclosed in a chamber without permeation. Also, the relationships between the flow of power-law liquid and the frictional resistance of the rotor were experimentally studied.
The velocity distribution of the liquid in the axial gap between the rotor and the fixed plate was broken down into three regions : the core and two boundary layers. The increase in the velocity profile consequent to a change in the rotational speed of the rotor, the dimensions of the chamber and the physical properties of the liquid were evaluated in terms of the center-to-disk ratio K of tangential velocity. The K-value was empirically determined from calculations based on a newly defined operational factor, thus providing a method for estimating the velocity of the liquid and the torque of the rotor in the filter. It was demonstrated that liquid motion in the closed chamber occurs in any of three types of flow according to the operational factor.
