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wall friction

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wall friction [′wȯl ‚frik·shən]
(fluid mechanics)
The drag created in the flow of a liquid or gas because of contact with the wall surfaces of its conductor, such as the inside surfaces of a pipe.


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These are generally aimed at reducing wall friction to allow the material to slip more easily; but, in some cases, high friction is employed to resist slip in selected regions of the hopper walls.
A very thin contact layer of fluid close to the wall has been discretized to some contact elements; while to satisfy the external wall friction acting on the contact elements, each of elements has been broken to some vortex points.
pattern shape, flask wall friction and mechanical compacting force variances, as illustrated in Fig.
 
 
 
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