Card 38 / 41: For liquid flow in an open channel, which of the following is an appropriate boundary condition for the liquid flow problem at the liquid-gas interface? I. The velocity of the gas is zero at the interface. II. The velocity of the gas and liquid are the same at the interface. III. There is no momentum transfer across the interface. IV. The velocity gradients of the gas and liquid are the same at the interface.
A)
I only
B)
I and II only
C)
I and IV only
D)
IV only
E)
II and III only
Answer:
E) II and III only
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