J. Peter Clark

There are at least two key facts to remember about mixing and blending, whether for solids in solids, liquids in solids, gases in liquids, or liquids in liquids. These are: 1) there is an optimum speed and time for any given system and 2) mixers need some head space or freeboard.

How do we know there is an optimum? In any process or unit operation, if one considers extremes of possible conditions or parameters, and at the extremes, there are unsatisfactory results, then there is some intermediate…

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