Heat Transfer
With increase in temperature, the thermal conductivity of a gas

Decreases
Remains same
Increases
May increase or decrease depending on the type of gas

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Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Temperature of the incoming vapor is very high
Higher condensing film co-efficient is desired
Lower pressure drop through the exchanger is desired
Condensate is corrosive in nature

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