On the mechanism of heat transfer in bubble column reactors

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Abstract

Bubble column reactors are often used to carry out highly exothermic reactions in liquid phase. Therefore the heat transfer from gas/liquid dispersion to immersed plates and coils may influence considerably reactor performance. Starting from the view of Kast it is possible to derive theoretically an equation for the heat transfer in bubble agitated systems. This is achieved by combining the surface renewal model of mass transfer with Kolmogoroff's theory of isotropic turbulence. The derived equation predicts the correct dependency of the heat transfer coefficient on all six parameters which effect heat transfer, and describes available experimental data covering a range of 6 ≤ Pr ≤ 1000 with striking agreement.

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