Exam 20: Understanding the Dominant Mechanism of Heat Transfer

It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is

(Multiple Choice)

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Question 21

Dropwise condensation is promoted on a/an __________ surface.

(Multiple Choice)

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Question 22

Maximum heat transfer rate is obtained in __________ flow.

(Multiple Choice)

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Question 23

Resistance to heat flow by conduction is proportional to (where, t & ? are thickness & density of the material respectively and A = area normal to the direction of heat flow.)

(Multiple Choice)

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Question 24

Fqra cold viscous feed, backward feed gives __________ than forward feed.

(Multiple Choice)

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Question 25

Showing 21 - 25 of 25

Dropwise condensation is promoted on a/an __________ surface.

Maximum heat transfer rate is obtained in __________ flow.

Resistance to heat flow by conduction is proportional to (where, t & ? are thickness & density of the material respectively and A = area normal to the direction of heat flow.)

Fqra cold viscous feed, backward feed gives __________ than forward feed.

Thermal Conductivity and Heat Transfer

Heat Transfer and Thermal Conductivity: Part A

Heat Transfer and Thermal Conductivity: Part B

Heat Transfer and Thermal Conductivity: Part C

Heat Transfer and Evaporator

Heat Transfer and Heat Exchangers: Part A

Heat Transfer and Heat Exchangers: Part B

Heat Transfer and Crystallisation

Heat Transfer and Thermal Properties: Part A

Heat Transfer and Thermal Properties: Part B

Heat Exchangers and Condensation

Thermal Properties and Processes

Concepts in Heat Transfer

Components of Radiation From Flames

Heat Transfer and Thermodynamics

Heat Transfer Processes, Thermometers, and Evaporators

Heat Transfer and Thermal Properties: Part A

Heat Transfer Mechanisms in a Spaced Plate System

Heat Transfer and Evaporation

Heat Transfer and Fluid Mechanics

Heat Transfer and Boiling Point Elevation in Solutions

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