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Question
A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter 'd'. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to
Options:
A .  d^(0.8)
B .  d^(-0.2)
C .  d⁻¹
D .  d^(-1.8)
Answer: Option B
Answer: (b).d^(-0.2)

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