Is the flow velocity at the wall zero? !
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According to fluid dynamics theory, the flow velocity at the pipe wall is zero. Is this an idealized zero, or is it actually zero?
Of course, ideally, there is exchange between the wall surfaces and the material in between.
Of course, ideally, there is exchange between the wall surfaces and the material in between.
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Relatively speaking, on a microscopic level it should be 0
This is a screenshot from a textbook on principles of chemical engineering