Estimation of collision efficiency

Unlike the collision effectiveness which is expressed by Langmuir s formula (cf Section 10.1), the capture efficiency Eg is determined by the grazing trajectory which characterises the possibility of particle attachment. Results obtained above make it possible to estimate this quantity since collisions on the main part of the surface at ocr do not result in capture. All of the simplifications used cause an increase of Eg. The cross-section of the stream tube from 

The theory developed substantially changes the notion of kinetics of flotation of smooth particles since the calculated efficiency is decreased by approximately one order of magnitude when compared with Sutherland s formula. However, the theory needs further development because the final Eq. (11.46) underestimates the value of Vpg and the centrifugal force due to 

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These differences have significant ramifications for the estimation of stability ratios or collision efficiencies in practice, and require that precise definitions be used. Table 1 shows various estimates of collision efficiency that have been made by a variety of techniques. Interpretation of this information requires a knowledge of how individuals define the measurement they are making. For example, many researchers have reported measuring collision efficiencies of 1.0 these values have typically been reported when / (r) is... 

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