Heat and Mass Transfer
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Reynold's number
Prandtl number, Grashoff's number
Grashoff's number
Reynold's number, Grashoff's number

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

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