Turbulent Heat Transfer in Circular Tube and Plane Channel

Channel With Constant Heat Flux at the Wall 

Now let us consider the case in which a constant heat flux q is given on the walls of a plane channel for X 0. We assume that for X 0 the walls are thermally isolated and the temperature tends to a constant T as X - -oo. 

We seek the asymptotic solution in the heat stabilization region (for x 1) in the form of the sum T = ax + 3 (y). The unknown variable a and the function k are determined by analogy with the case of a circular tube. As a result, we have 

From the temperature distribution (3.6.14) far from the input cross-section, one can find the limit Nusselt number 

Formulas for calculating the Nusselt number along the channel in the case of high Peclet numbers are given in [341], 

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Turbulent Heat Transfer in Circular Tube and Plane Channel... 

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