Ratio of tube length to shell diameter for a shell and tube heat exchanger is________________?

A. 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers

B. 4 : 1 to 8 : 1 for liquid-liquid exchanger

C. < 4 : 1 for gas-gas exchangers

D. Both B. & C.

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