Mathematical model of gas-liquid-sand mixture separation in the four-phase separator of inertial type for subsea application.
Bogdan Kopej, T. Krivonožko, M. Lâh, E. Ur'ev
Vol. 33, no. 2 (2016), s. 361-376, 
In this article the construction and mathematical model of four-phase separator is realized, which is based on inertial separation mechanism of gas-liquid-sand mixture. Also we have put the problem on the basis of this model to obtain the dependence of separator efficiency on the parameters which play a crucial role in the technological process of separating gas-oil-water-sand mixture into a solid, liquid and a gas phase.