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

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

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Process Equipment and Plant Design
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

Sensible heat differences are small, because the temperature changes from tray to tray is small
All of these
Liquid/vapor loading across the column remains constant
Trouton's rule is applicable

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