Process Equipment and Plant Design
The LMTD correction factor (FT) is defined as the

Ratio of LMTD to the true temperature difference
Geometric mean of the true temperature difference and the LMTD
Differenced of true temperature difference and the LMTD
Ratio of true temperature difference to the LMTD

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Process Equipment and Plant Design
In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement

Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid
Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient
Results in higher shell side pressure drop
Can accomodate less number of tubes for a given shell diameter

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Process Equipment and Plant Design
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?

To reduce the induced vibration in the tubes
To increase the residence time of shell side fluid
To provide support to the tube bundle
To increase the tube side heat transfer co-efficient by inducing turbulence

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