The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles ?

A. To increase the tube side heat transfer co-efficient by inducing turbulence

B. To reduce the induced vibration in the tubes

C. To increase the residence time of shell side fluid

D. To provide support to the tube bundle

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