Chemical Heat Transfer

Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_____________________?

Byadmin March 3, 2019August 24, 2021

Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_____________________?

A. Prandtl number
B. Grashoff number
C. Thermal conductivity
D. Viscosity

Chemical Heat Transfer

Heat transfer by natural convection is enhanced in system with__________________?

Heat transfer by natural convection is enhanced in system with__________________?

A. High viscosity
B. High co-efficient of thermal expansion
C. Low temperature gradients
D. Low density change with temperature

Read More Heat transfer by natural convection is enhanced in system with__________________?
Chemical Heat Transfer

Agitated film evaporator is suitable for concentrating _____________ liquids?

Agitated film evaporator is suitable for concentrating _____________ liquids?

A. Foaming
B. Viscous
C. Very thin
D. Corrosive

Read More Agitated film evaporator is suitable for concentrating _____________ liquids?
Chemical Heat Transfer

Heat transfer by ____________ may not necessarily require the presence of a medium?

Heat transfer by ____________ may not necessarily require the presence of a medium?

A. Conduction
B. Natural convection
C. Forced convection
D. Radiation

Read More Heat transfer by ____________ may not necessarily require the presence of a medium?
Chemical Heat Transfer

Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?

Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?

A. 50 -100 Kcal/hr.m2.°C
B. 50 -100 W/m2.°K
C. 50 -100 BTU/hr. ft.2°F
D. 1000 – 1500 BTU/hr. ft.2°F

Read More Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?
Chemical Heat Transfer

Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger ?

Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger ?

A. Corrosiveness
B. Fouling characteristic
C. Viscosity
D. None of these

Read More Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger ?
Chemical Heat Transfer

For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature) ?

For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature) ?

A. Δt
B. Δt2
C. Δt3
D. √(Δt)

Read More 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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