DAL under condition of large Reynolds numbers

INVESTIGA TION OF DAL UNDER CONDITION OF LARGE REYNOLDS NUMBERS 

Reasonable investigations under these conditions are restricted by the state of the DAL theory which has been developed so far only for conditions of very strong and weak surface retardation (cf Section 8.6). Collision efficiency has been derived only for potential flow conditions (Sutherland, 1948). With increasing surfactant concentration up to c[ (Eqs 8.135 -8.136), a beginning decrease of bubble velocity may be expected. A respective rear stagnant cap results in a decrease of collision efficiency only when attachment of the particle is accomplished not due to the of instability of the water interlayer at some thickness h but under the effect of attraction forces (Appendix lOB). 

With the constraint (8.72) that this takes place at c = cj, and with the constraint (8.71), the limiting concentration corresponds to a rather large Xb compared with q. It is of interest to 

In conclusion of this section and in accordance with the results obtained in the preceding sections it can be recalled that in studies of DAL by microflotation methods it is necessary to provide attachment of particles on bubble surfaces. The results are then controlled only by the transport stage of the elementary flotation act. 

Dynamic Adsorption Layer and Optimisation of Transport Stage of Flotation 

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