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- W2037566746 abstract "Though much has been done in the examination of the critical impeller speed, NJS, just necessary for suspension of solid particles, any theory available does not fit well the data for a wide range of variables. An attempt is made to develop a theoretical model of the process based on the comparison of the terminal velocity of a particle and the characteristic velocity of the agitated liquid round the particle at the bottom. The velocity field near the bottom is deduced from the values of local shear rates as estimated before by an electrodiffusion method. Literature data on NJS indicate that the model is acceptable even under extreme conditions. The dependence of the normalized critical impeller speed, NJS*, on the normalized particle diameter, dp*, is NJS* = {(BJS/Amin)[dp*/(18 + 0.6dp*3/2)]}2/3 where Amin is a constant assumed to be dependent on geometrical simplexes of the mixing equipment only. BJS is a constant which may depend on the particle shape. The model even explains effects of other variables such as impeller and tank diameters, liquid viscosity, and densities. Some of these effects cannot be interpreted by a single-power function valid for a wide range of dp* covering industrially important problems of the solid suspension." @default.
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- W2037566746 date "1988-01-01" @default.
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- W2037566746 title "Conditions for suspension of solids in agitated vessels" @default.
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- W2037566746 doi "https://doi.org/10.1016/0009-2509(88)87007-6" @default.
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