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A chemically reacting fluid flows through a channel.Design considerations require that the flow area of the duct be abruptly
reduced to 1/10th of its size. To prevent destruction of the duct by the reacting fluid,no stagnant eddies at the contraction can be allowed.have some control over the duct length upstream of the contraction, and thus the velocity profile of the fluid approaching the contraction. To solve this problem, you must somehow
estimate the flow field near the contraction.

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