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The multiphase application of screw pumps, especially at high pressures and gas volume fractions implicates thermal loads for the solid components of the pump. For the evaluation of these loads and their consequences, a finite volume heat transfer model for the screws, as the main parts of a screw pump, was developed to describe and simulate the transient and 3-dimensional heat transfer process. The time-dependent heat transfer is mainly influenced by convection and thus by the rotational speed of the screws and by the tempera-ture distribution of the multiphase fluid along the screw surface.
Screw pumps are widely used in conditions of operation, where a constant flow rate and low pulsation are desirable. The type of screw pump, whose gaps are theoretically investigated in this paper, is a twin screw pump, which is used for multiphase operations. Due to the lack of knowledge concerning the pumping behaviour at very high gas volume fractions up to 100 %, the compressible gap flow inside a screw pump has to be investigated with techniques such as computational fluid dynamics more accurately. The development of a finite volume model for the compressible flow in each gap allows a prediction of the thermodynamic behaviour and of the inner leakage flow rate and thus, the effective flow rate of the pump. The resulting pressure and temperature distributions will enhance the understanding of the pump operation.