The previous section examines the particle separation performance
under low inlet velocity condition. This section examines the
separation performance under the condition of high inlet velocity.
Fig. 13 shows the relation between 50% cut size and the apex cone
angle under cyclone inlet velocity of 16.3 m/s. It is found that 50% cut
size does not depend on the apex cone angle. The numerical results
shown in the dotted line also indicated the same results. In order to
find out the reason obtained in Fig. 13, the flow visualization
experiments by use of soap foam under high inlet velocity condition
was also carried out.
Fig. 14 shows the experimental results taken from various apex
cone angles. The general patterns are nearly equal to the data shown
in Fig. 9. The area of soap foam is maximum for the cone angle of 70°.
The region without the soap foam corresponds to the upward flow