Heat and Mass Transfer
Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

k. A. (dT/dx)
k. (dT/dx)
k. A. (dx/dT)
k. (dx/dT)

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Heat and Mass Transfer
Which of the following would lead to a reduction in thermal resistance?

In radiation, increasing the temperature and reducing the emissivity.
All of these
In convection, stirring of the fluid and cleaning the heating surface.
In conduction, reduction in the thickness of the material and an increase in thermal conductivity.

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Heat and Mass Transfer
Film coefficient is defined as the ratio of

Thickness of film of fluid to the thermal conductivity
Thickness of film of fluid to the temperature drop through the films of fluids
Temperature drop through the films of fluids to the thickness of film of fluids
Thermal conductivity to the equivalent thickness of the film of fluid

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