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Answer:
The answers given above are based on the assumptions that the secondary flow from compartment A to 1 is positive,
and its volume flow rate is large compared with that injected at the jet. At Q=0, the secondary flow at 1 is in the negative
direction, balancing exactly the positive volume flow of the jet. Clearly, both
these assumptions are invalid and our solution does not apply. The minimum
value of Q for this analysis to
apply can be found by determining the value of Q that is just high enough that both of these
assumptions are adequately satisfied.
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