Gas Cyclones and Swirl Tubes: Principles, Design, and by Alex C. Hoffmann

By Alex C. Hoffmann

The topic of this booklet is centrifugal gasoline separation units, particularly cyclones used for gasoline purification, solids assortment and for demisting. The optimization of cyclone functionality for any given activity is an often-sought target yet is seldom completed in perform. knowing cyclone functionality as a functionality of a cyclone's measurement, geometry, feed homes, feed move premiums and the procedure of which it's a half, is vital if one needs to effectively layout, function, troubleshoot or are expecting cyclone functionality. the knowledge offered during this multiplied ebook variation might help to increase this knowing.

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3 Centrifugal/Cyclonic Devices Centrifugal and cyclonic type separators are the subjects of this book. Compared with the other methods, their advantages are: • • • • • • • • • • • • the collected product remains dry and, normally, useful low capital investment and maintenance costs in most applications very compact in most applications can be used under extreme processing conditions, in particular at high temperatures and pressures and with chemically aggressive feeds. no moving parts very robust constant pressure drop can be constructed from most any material suitable for the intended service including plate steel, casting metals, alloys, aluminum, plastics, ceramics, etc.

5, and the ‘mode’, defined as the size where f (x) takes its maximum value. We note here that the mean and the median sizes are often close in practice, and that, of these two, the median size is much easier to determine by reading directly off the cumulative size distribution. The median is therefore often taken as the ‘mean’ particle size for a given powder in practice, while in the model distribution functions the mean is that defined in Eq. 4). 4 Particle Density 37 follow common practice by using the median diameter as a measure of the ‘mean’ particle size in this book, we will refer to it as the ‘(mass) average’ or the ‘median’ size, but always use the symbol xmed when we mean the median.

2. A slip takes place between the gas and the particle as the free space between the gas molecules becomes comparable to the particle size. 8) where λ is the molecular mean free path. 7). Thus, the ’effective’ viscosity becomes the gas viscosity times the Cunningham correction factor. It has the effect of always decreasing the effective viscosity and, hence, the drag that all particles—not just the the sub-micron particles—experience. We now turn our attention to the behavior of a particle in a swirling flow.

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