LOCAL SLIP VELOCITY IN A DOWNER

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Based on the EMMS model, the local slip velocity between gas and solid is systematically analyzed and a theoretical correlation of local slip velocity with local voidage for a downer is derived as follows:us(r)/ut= D8/7(1 - εmf)-2/7[1 - ε(r)/ε(r)]8/7ε(r)4
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