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For flow in a pipe, under what conditions the hydraulic entry length and thermal entry length are approximately the same (Xract Xfd.n)? (a) Pr=1, (b)

For flow in a pipe, under what conditions the hydraulic entry length and thermal entry length are approximately the same (Xract Xfd.n)? (a) Pr=1, (b) Pr>> 1, (c) Pr 1, (d) Re 4,000. O a Ob O a&d a or e

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