This paper is concerned with a study of the efficiency of vertical separators intended to gas liquid applications. A compact configuration of coaxial cylinders in which a multiphase flow is vertically flowing can achieve gas liquid separation by the use of gravity in a certain range of gas-liquid flow rates. With this method the separated liquid can be collected in the lower part of the system without any gas carry under. The stability limit of such separators has been identified regarding the inlet conditions and the geometry of the system.

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