Chemical Engineering :: Heat Transfer
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Pick out the wrong statement.
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For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in
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Economy of an evaporator is influenced by the
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If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law.
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In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred
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__________ equation relates the thermal conductivity of a solid to its temperature.
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For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)
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Pick out the wrong statement.
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Viscous & heat sensitive liquids are concentrated in __________ evaporators.
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A.
By increasing the number of shell passes, the temperature cross in a shell and tube heat exchanger can be prevented.
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B.
An underdesigned steam trap will back up the condensate instead of discharging it out.
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C.
Steam condensate is corrosive because of the presence of dissolved oxygen in it.
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D.
Film boiling is desirable in commercial equipments due to high heat transfer rate at low temperature drop.
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A.
The condensing film co-efficient is about 3 times lower for vertical condenser as compared to the equivalent horizontal condenser for identical situation.
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B.
Film co-efficient for vaporisation decreases as a result of vapor binding.
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C.
In industrial practice, sub-cooling of condensate is required, when the condensate is a volatile liquid and is to be transferred for storage.
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D.
Overall heat transfer co-efficient in a heat exchanger is controlled by the value of the film co-efficient, which is higher.
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