By Prof. Dr. Alex C. Hoffmann, Dr. Louis E. Stein (auth.)
Read or Download Gas Cyclones and Swirl Tubes: Principles, Design and Operation PDF
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Extra info for Gas Cyclones and Swirl Tubes: Principles, Design and Operation
Sample text
Since the particle volume is proportional to x 3, the larger particles contribute much more to the volume distribution than to the number distribution. This can be seen in the shapes ofthe curves in Fig. 8. The larger particles contribute negligibly to the number distribution, which appears to go to zero, while they contribute substantially to the volume distribution. The same holds true for the mass or weight distribution. Forthis reason it is also difficult to obtain a statistically satisfactory volume distribution from sizing methods based on particle counting if the particle size distribution is wide (many small particles need tobe counted for each large one).
In order to give an impression of the flow of a particle through a cyclone, we can resort to CFD simulations. 3 shows a series of particle trajectories. The particles are injected at different radial positions along the inlet in a precalculated gas flow field. The swirling motion is not shown. Although the object is to centrifuge the particles to the wall and capture them, it is interesting to Iook at particles so fine that some of them are not collected. 0 jlm was used to generate the particle paths shown in Fig.
This is sketched in Fig. 2. Depending on our point of view, we could also say that this pressure force gives rise to the centripetal acceleration. The pressure in a swirling flow thus increases with the distance from the axis of rotation. Now imagine first that the swirling fluid has an infinite viscosity (behaves like a solid body). Hence, no shearing motion exists between fluid layers at different radii. In this case fluid elements at all radial positions are forced to have the same angular velocity.