Write down the expressions for the physical laws that govern each mode of heat transfer, and identify the variables involved in each relation.
What will be an ideal response?
Conduction is expressed by Fourier's law of conduction as 
where dT/dx is the temperature gradient, k is the thermal conductivity, and A is the area which is normal to the direction of heat transfer.
Convection is expressed by Newton's law of cooling as 
where h is the convection heat transfer coefficient, As is the surface area through which convection heat transfer takes place, Ts is the surface temperature and T? is the temperature of the fluid sufficiently far from the surface.
Radiation is expressed by Stefan-Boltzman law as 
where is the emissivity of surface, As is the surface area, Ts is the surface temperature, Tsurr is the average surrounding surface temperature and is the Stefan-Boltzman constant.
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