Question: 2 . ) A flow of air with R e D = 2 0 0 and P r = 0 . 7 enters a tube

2.) A flow of air with ReD=200 and Pr=0.7 enters a tube of diameter 1 cm and length of 50 cm . Is this a thermal entry length problem or a combined entry length problem? Justify your answer with a number: (10 pts.)
2 . ) A flow of air with R e D = 2 0 0 and P r =

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