Fourier's Law Of Heat Transfer
net effect is a transport of energy and it takes place in the direction of lower temperature gradient and named as heat transfer by convection. Hence, there are mainly three modes of heat transfer e.g. conduction, convention and radiation. Fourier noticed that the quantity of heat (q) transferred through unit area in unit time is directly proportional to difference of temperatures between the layers and inversely proportional to distance h between them is given by q=ĸ ((T_1-T_2 ))/h, … (1.7)
Where ĸ is the constant of proportionality and known as the coefficient of thermal conductivity. When the distance h between two layers of the fluid is infinitesimal small, then quantity of heat q is given by q=-ĸdT/dy, … (1.8)
Which is called Fourier’s law of heat conduction. Here negative sign shows that the heat flows in the direction of decreasing temperature. The coefficient of thermal conductivity ĸ
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