Heat Transfer
In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of

Mass transfer co-efficients
Chemical potentials
Activity co-efficients
Concentrations

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Heat Transfer
Baffle spacing

None of these
Is not the same as baffle pitch
Should be less than one fifth the diameter of the shell
Should be less than the inside diameter of the shell

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