The concept of overall coefficient of heat transfer is used in case of heat transfer by

Question

RRB Paper · Accepted Answer

The heat transfer coefficient or film coefficient, or film effectiveness, in thermodynamics and in mechanics is the proportionality constant between the heat flux and the thermodynamic driving force for the flow of heat (i.e., the temperature difference, ΔT):

The overall heat transfer rate for combined modes is usually expressed in terms of an overall conductance or heat transfer coefficient, U. In that case, the heat transfer rate is

Q = hA(T₂ − T₁)

where:

A = surface area where the heat transfer takes place, m²

h = heat transfer coefficient

T₂ = temperature of the surrounding fluid, K

T₁ = temperature of the solid surface, K.

The concept of overall coefficient of heat transfer is used in case of heat transfer by

Conduction

Convection

Radiation

Conduction and convection

The correct answer is `No. 4: Conduction and convection`

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The concept of overall coefficient of heat transfer is used in case of heat transfer by

Conduction

Convection

Radiation

Conduction and convection

The correct answer is No. 4: Conduction and convection

The correct answer is `No. 4: Conduction and convection`