Cyclones geometric configuration

Figure 7.8. Geometric configuration of the tangential inlet cyclone.

The mean residence time rm of gas can be related to the geometric configuration of the cyclone and the inlet flow rate. It is reasonable to take rm as the average of the minimum residence time rmi and the maximum residence time rm2, where rmi is the average time required for the gas to descend from the midlevel of the entrance to the exit at the bottom of the cyclone. Thus, we have... 

Obviously the vortex tube shown in Fig. 7.3.4 is very similar to a cyclone, and the exit tube very similar to the vortex finder in a cyclone. One very interesting feature found by Derksen is a vortex breakdown of type 0 , according to the classification of types of vortex breakdown by Faler and Leibovich (1977), in the exit tube at certain flowrates and in certain geometrical configurations. In a type 0 breakdown, a gas bubble with recirculatory flow is formed at the point where the vortex breaks down, and the flow downstream is much more turbulent, and less intensely swirling. Derksen s simulations are shown in Fig. 7.3.5. 

Cyclone configuration factor G This is specified by the geometric ratios that describe the cyclone s shape. The cyclone configuration factor G is a function only of the configuration and is specified by the seven geometrical ratios that describe its shape. G is expressed as ... 

CALCULATE CYCLONE CONFIGURATION FACTOR SPECIFIED BY THE GEOMETRIC RATIOS THAT DESCRIBE THE CYCLONE S SHAPE... 

Design configuration—The overall size of the cyclone is characterized by the cyclone body diameter D, and the seven geometric ratios = —,Ki,= —,... 

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