Process Equipment and Plant Design
The value of fouling factor depends upon the

Velocity of process fluid containing suspended solids
All of these
Characteristic of process fluid
Suspended solids in the fluid

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Process Equipment and Plant Design
In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference

Is always less than arithmetic average value
May be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current
Is always more than arithmetic mean value and the geometric mean value
Is always less than arithmetic mean value, but more than geometric mean value

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