Question 39 / 40:  For liquid flow in an open channel, which of the following is an appropriate boundary condition for the liquid flow problem at the liquid-solid interface at the bottom of the channel?
A  No slip
B  Zero velocity gradient
C  Zero velocity
D  Zero normal stress
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Explanation:

The best choice is no slip; this implies that the velocities of the two phases (conduit wall and fluid) are equal at the interface. The conduit wall velocity is not necessarily zero.

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Fluid Mechanics ME201

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Attribution:  Stephanie Redfern and Tuan Dinh. Fluid Mechanics. The Saylor Academy 2014, http://www.saylor.org/courses/me201/
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