https://en.wikipedia.org/wiki/No-slip_condition
Quote:
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At the boundary between the fluid and a solid surface, the attraction between the fluid molecules and the surface atoms is strong enough to slow the bulk velocity to zero. Consequently, the bulk velocity of the fluid decreases from its value away from the wall to zero at the wall.
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IMHO opinion (I don't have the time to read your links
) the plasma creates a virtual surface with a non-zero velocity for the bulk flow to adhere to.