A reactor is thermally stratified as in the following table:
Depth, m | 0 | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 |
Temperature,°C | 70 | 70 | 55 | 22 | 13 | 10 | 10 |
Based on these temperatures, the tank can be idealized as two zones separated by a strong temperature gradient or thermocline. The depth of the thermocline can be defined as the inflection point of the temperature-depth curve—that is, the point at which d2 T/dz2 = 0. At this depth, the heat flux from the surface to the bottom layer can be computed with Fourier's law:
Use a clamped cubic spline fit with zero end derivatives to determine the thermocline depth. If k = 0.01 cal/ (s • cm • °C) compute the flux across this interface.
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