Water at a flow rate of m0.215 kg/s is cooled from70C to

Chapter 8, Problem 8.62

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Water at a flow rate of m??0.215 kg/s is cooled from70C to 30C by passing it through a thin-walled tubeof diameter D?50 mm and maintaining a coolant atT??15C in cross flow over the tube.(a) What is the required tube length if the coolant is airand its velocity is V?20 m/s?(b) What is the tube length if the coolant is water andV?2 m/s

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