Abstract
In the first and second reports, we described about the classifying characteristics and its analytical method of our new designed classifier by using the cement powder which is passed through the sieve of 200 mesh Tyler Standard Screen as for the four and two classes classification of the particles. But, in order to understand the state of classification of particles in the classifying chamber, it is necessary to investigate the flow patterns of the vortex in chamber. In this report, when the inner and outer pipes of the classifier have a gap or a lap at their both ends and the air stream velocity at the inlet of the classifier is changed at over range of 4.9∼13m/s, we measured the spiral angle, distribution of the static and total pressures, tangential and vertical components of the total velocity of the spiral flow in chamber by a small cylindrical Pitot tube. From the experimental results, we made an analytical and theoretical consideration concerning to the deflection of air flow at the exit of the guide vanes, the distribution of the static pressure difference of the classifier, the relation between the pressure drop through the classifying chamber and air quantity, the relation between the minimum diameter of the classified coarse particles and air stream velocity at the inlet of the classifier.
