By M.F. Edwards, N. Harnby and J.C. Middleton (Auth.)
Read or Download Fluid Mixing II. A Symposium Organised by the Yorkshire Branch and the Fluid Mixing Processes Subject Group of the Institution of Chemical Engineers and Held at Bradford University, 3–5 April 1984 PDF
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Additional info for Fluid Mixing II. A Symposium Organised by the Yorkshire Branch and the Fluid Mixing Processes Subject Group of the Institution of Chemical Engineers and Held at Bradford University, 3–5 April 1984
Sample text
The walls contain a greater proportion of fine particles than the blades. Similar results are obtained when ballotini is substituted for the sand, however the fine ballotini shows a preference for blades rather than the wall-see Figure 5. The same effects are observed when water is used as the liquid. It is clear that the cake has a higher liquid content than the bulk material and also contains a greater proportion of fine particles. Possible mechanisms of cake formation will now be discussed and their implications studied.
Therefore, liquid positively migrates from the bulk to the cake and caking is an inherent property of the mixer and material, not just of the method of liquid addition. Cake can also be formed by wet particles sticking to walls and blades or previously formed cake, as those particles are moved around by the blades. In regions where the bonds formed are stronger than the stresses exerted by the blades, cake will form and grow. This explains the transfer and exchange of particles between the bulk and cake, but cannot readily explain why the cake has a higher liquid content.
GEOMETRY D » stirrer diameter C : off bottom clearance S » sparger separation T«Q44m J Figure 1. Vessel geometry Figure 2. Impeller geometry 55 to processor Symposium Series No. OAAm pitch. 50T [flat b o t t o m N p =3 25j Fi q. 3. \ >=*= Fig. 4a. 4T _i 1 Fig. 4b. Summary of data, showing the influence of gas sparging on nower at an impeller speed of 3 Hz 56 Symposium Series No. 89 . Q/ND . ι J "1 3 1 1 1 Fiqure 4c. a and b. llcm J *==**. o-a«wv Figure 6. Gassed power curves 6 Hz for different mass fractions of solid Darticles 57 Symposium Series No.