Chemical Heat Transfer

The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature) ?

Byadmin March 3, 2019August 24, 2021

The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature) ?

A. (ΔT)2
B. (ΔT)4
C. (ΔT)3
D. √(ΔT)

Chemical Heat Transfer

In a boiling curve, the peak heat flux is called the _____________ point?

In a boiling curve, the peak heat flux is called the _____________ point?

A. Nusselt
B. Leidenfrost
C. Boiling
D. Burnout

Read More In a boiling curve, the peak heat flux is called the _____________ point?
Chemical Heat Transfer

A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?

A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?

A. CPA > CPB
B. CPA < CPB
C. kA < 0.5 kB
D. kA >2 kB

Read More A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?
Chemical Heat Transfer

The critical radius ‘r’ of insulation on a pipe is given by____________________?

The critical radius ‘r’ of insulation on a pipe is given by____________________?

A. r = 2k/h
B. r = k/h
C. r = k/2h
D. r = h/k

Read More The critical radius ‘r’ of insulation on a pipe is given by____________________?
CHEMICAL ENGINEERING | Chemical Heat Transfer

Baffles are provided in heat exchangers to____________?

Baffles are provided in heat exchangers to____________?A. Remove dirt
B. Increase heat transfer rate
C. Reduce vibrations
D. Reduce heat transfer rate

Read More Baffles are provided in heat exchangers to____________?
Chemical Heat Transfer

In SI units, thermal conductivity is expressed in__________________?

In SI units, thermal conductivity is expressed in__________________?

A. Watt/m.°K
B. Watt/m2. °K
C. Watt/m2. °K
D. Watt/m4. °K

Read More In SI units, thermal conductivity is expressed in__________________?
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__________________?