In a double pipe concentric heat exchanger, the equivalent diameter o – McqOptions

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1.	In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)
A.	(D₂² - D₁²)/D₁²
B.	D₂ - D₁
C.	(D₂² - D₁²)/D₂²
D.	None of these
Answer» B. D₂ - D₁

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