Consider we have a Double Pipe Heat Exchanger, with the inner tube of diameter 20mm (neglect thickness) and outer tube of diameter 30mm. We have two fluids A & B (both with viscosity 2.5×10-5Pa-s), we desire to have their flow rates as 15Kg/s and 21Kg/s respectively. What is the Friction Factor (F) for this setup for the inner pipe?

Consider we have a Double Pipe Heat Exchanger, with the inner tube of

1.	Consider we have a Double Pipe Heat Exchanger, with the inner tube of diameter 20mm (neglect thickness) and outer tube of diameter 30mm. We have two fluids A & B (both with viscosity 2.5×10-5Pa-s), we desire to have their flow rates as 15Kg/s and 21Kg/s respectively. What is the Friction Factor (F) for this setup for the inner pipe?
A.	0.0086
B.	0.086
C.	0.0068
D.	0.068
Answer» B. 0.086

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