Chemical Heat Transfer

In forced convection, the Nusselt number is a function of ____________________?

Byadmin March 2, 2019August 24, 2021

In forced convection, the Nusselt number is a function of ____________________?

A. Re and Pr
B. Re and Gr
C. Pr and Gr
D. Re and Sc

Chemical Heat Transfer

In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is ________________?

In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is ________________?

A. More
B. Less
C. Same
D. More or less; depends on the nature of solution

Read More In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is ________________?
Chemical Heat Transfer

For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus- Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of________________?

For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus- Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of________________?

A. 1
B. 1.74
C. 6.1
D. 37

Read More For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus- Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of________________?
Chemical Heat Transfer

When vaporisation takes place directly at the heating surface, it is called________________?

When vaporisation takes place directly at the heating surface, it is called________________?

A. Film boiling
B. Nucleate boiling
C. Vapour binding
D. None of these

Read More When vaporisation takes place directly at the heating surface, it is called________________?
Chemical Heat Transfer

For what value of Prandtl number, the Col-burn analogy is valid ?

For what value of Prandtl number, the Col-burn analogy is valid ?

A. 0.06 to 120
B. 0.6 to 120
C. 1 to 103
D. 1 to 50

Read More For what value of Prandtl number, the Col-burn analogy is valid ?
Chemical Heat Transfer

Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around _____________ metres/second?

Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around _____________ metres/second?

A. 1
B. 10
C. 20
D. 30

Read More Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around _____________ metres/second?
Chemical Heat Transfer

The rate of emission of radiation by a body does not depend upon the__________________?

The rate of emission of radiation by a body does not depend upon the__________________?

A. Wavelength of radiation
B. Surface temperature of the body
C. Nature of the surface
D. Shape and porosity of the body

Read More The rate of emission of radiation by a body does not depend upon the__________________?

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