Heat and Mass Transfer
In regenerator type heat exchanger, heat transfer takes place by

A complete separation between hot and cold fluids
Flow of hot and cold fluids alternately over a surface
Generation of heat again and again
Direct mixing of hot and cold fluids

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Heat and Mass Transfer
A steam pipe is to be insulated by two insulating materials put over each other. For best results

Whether to put inferior OIL over pipe or the better one would depend on steam temperature
Inferior insulation should be put over pipe and better one over it
Both may be put in any order
Better insulation should be put over pipe and better one over it

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