determination of fully developed flow
i am interested in finding the entry length for several Reynolds numbers for flow in a straight rectangular duct. the criteria i used to determine the entry length was that the second derivative of the pressure with respect to the streamwise direction be less than certain predefined value of epsilon, (d^2P/dz^2 < epsilon). it was found that different values of epsilon give different entry length (note that the difference is significant).
what is the appropriate magnitude of epsilon? 1e-4? 1e-5?
other that the above mentioned criteria, what other criteria can i use?
thanks in advance.
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