Modes of Heat and Mass Transfer. P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi. Just as Intelligent as an Human Being. Modes of Heat & Mass Transfer. Conduction or Diffusion Convection Radiation. Conduction Heat Transfer.
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P M V Subbarao
Mechanical Engineering Department
Just as Intelligent as an Human Being .. ..
A Constitutive Relation
This is called as Fourier Law of Conduction
The (mod of) heat flux, q’’, (the flow of heat per unit area and per unit time), at a point in a medium is directly proportional to the temperature gradient at the point.
Temperature gradient across the slab of thickness Dx:
The heat flux across the slab
Global heat transfer rate:
Using the principles of vector calculus:
Will mathematics approve this ?
What is the most general acceptable behavior of k, approved by both physics and mathematics?
We are at cross roads !!!!!
Thermal conductivity of a general material is a tensor.