Process Equipment and Plant Design
When one of the fluids is highly corrosive and has fouling tendency, it should

Perferably flow outside the tube
Preferably flow inside the tube for its easier internal cleaning
Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current
Flow at a very slow velocity

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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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