Computing and measuring the flowfield in a de-oiling hydrocyclone

Hargreaves, John Harold (1990) Computing and measuring the flowfield in a de-oiling hydrocyclone. University of Southampton, Doctoral Thesis.

Abstract

De-oiling hydrocyclones are already in use but performance prediction relies on lengthy and incomplete experiments. Operators require better predictions of performance and also to be able to assess the weight to performance trade off in relation to other separators. With the aid of a computerised model of the hydrocyclone performance, such predictions could be quickly and cost effectively made.

Up to date the only comparative survey that has been undertaken was for a slightly less refined version of the model herewith. Even from this the results gave much information regarding optimum flowrates and split ratios, as well as providing a further understanding of the hydrocyclone's flow mechanics.

Of the many possible modelling techniques and turbulence models available, a Finite Difference four equation Algebraic Stress Model was chosen. Of the other models and packages, the most appropriate are herein reviewed.

Such a numerical flowfield requires verification through experimental investigation; as has been done previously. However, the data collected in this present work has employed the most accurate measuring technique available, Laser Doppler Anemometry. The ensuing data not only gives verification of previous results, but has quantified both the accuracy of the numerical model and the anomalies within the hydrocyclone Rankine vortex..

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