PERFORMANCE PREDICTION OF MULTIPHASE TWIN-SCREW PUMPS

A review on mathematical modeling and experimental procedures

The increasing requirements on the performance of multiphase pumping systems combined with those related to a higher operational availability of such systems, as well as operating conditions with pressure increase of about 150 bar, highlights the importance of developing accurate mathematical models to predict the performance behavior of these equipment.

This paper, by performing a fairly comprehensive literature search, presents a review of the found mathematical modeling and experimental procedures to predict the thermo-hydraulic behavior and performance of multiphase pumping

systems based on twin-screw pumps. Mathematical models to predict multiphase flow characteristics, pressure drop in narrow rotating annular clearances, pressure distribution and build up along pump chambers, back flow and heat transfer through rotors and casing are described and discussed. Experimental procedures to evaluate pressure and temperature distribution as a function of gas void fraction, inlet and discharge pressure and rotating speed are summarized and compared. Also experimental studies of the dependence of flow rate with pressure difference and gas void fraction are taken into account.