Experimental energy balance for the metering zone of a twin screw extruder

The object of this study is to investigate experimentally the mechanical po wer transported from the screws to the polymer melt, the heat dissipated in the polymer melt and the heat transfer to the barrel for the metering zone of a twin screw extruder. For the experimental investigations different sc rew elements, mixing elements and kneading discs are used. The experimental results for the dissipation show good agreement with known calculation mod els. For the calculation of the heat transfer a new equation is used to cal culate the mean temperature difference under consideration of the dissipati on. Another calculation model is presented to calculate the Nusselt-Number as a function of the Brinkmann-Number.