The dynamics of fluidization are increasingly important to many manufacturing and engineering applications, including mold- ing and coremaking operations, in the foundry. In aggregative fluidizations, there are several abnormalities primarily related to the characteristics of the solid phase, the fluid phase and/or the design of the equipment. Channeling or cohesive flow is an abnormality in which large amounts of gas flow through paths in a sand bed. In through-channeling, the gas flows through the path in the entire nonfluidized bed. In intermediate channeling, only a part of the bed is not fluidized, and the fluid flows through the path in this nonfluidized portion.
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