Any lenght you can chose define a Reynolds number, there is not a unique definition.
However, the key is that you want (I think) that in the non-dimensional equations the non-dimensional numbers characterize the problem. That is you have to use the characteristic velocity, lenght, time and so on, such that the terms are of O(1) and the non-dimensional number characterizes the relevance of each term. In your case you can use the inlet size. |
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