In the calculation of Reynold s Number for the Friction factor of the shell, which is the correct formula for equivalent diameter De?

( frac{4 (D_{io}^2 D_{oi}^2) frac{ }{4}}{ (D_{io}+D_{oi})} )

( frac{4 (D_{oi}^2 D_{io}^2) frac{ }{4}}{ (D_{io})} )

( frac{4 (D_{io}^2 D_{oi}^2) frac{ }{4}}{ (D_{io})} )

( frac{4 (D_{io}^2 D_{oi}^2) frac{ }{4}}{ (D_{io}+D_{oi})} )

In the calculation of Reynold s Number for the Friction factor of the

1.	In the calculation of Reynold s Number for the Friction factor of the shell, which is the correct formula for equivalent diameter De?
A.	( frac{4 (D_{oi}^2 D_{io}^2) frac{ }{4}}{ (D_{io})} )
B.	( frac{4 (D_{io}^2 D_{oi}^2) frac{ }{4}}{ (D_{io})} )
C.	Depends on the pitch
D.	( frac{4 (D_{io}^2 D_{oi}^2) frac{ }{4}}{ (D_{io}+D_{oi})} )
Answer» D. ( frac{4 (D_{io}^2 D_{oi}^2) frac{ }{4}}{ (D_{io}+D_{oi})} )

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In the calculation of Reynold s Number for the Friction factor of the shell, which is the correct formula for equivalent diameter De?

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