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International Journal of Fluid Mechanics Research

ISSN Print: 1064-2277
ISSN Online: 2152-5102

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.2017016140
pages 41-64

TWO-PHASE FLOW FIELD IN A CYLINDRICAL HYDROCYCLONE WITH TANGENTIAL DISCHARGE

Marzio Piller
Department of Engineering and Architecture, University of Trieste, Trieste, 34127, Italy
Jure Mencinger
Department of Mechanical Engineering, University of Ljubljana, Ljubljana, 1000, Askrceva 6, Slovenia
Gianni Schena
Department of Engineering and Architecture, University of Trieste, Trieste, 34127, Italy
Girolamo Belardi
Istituto di Geologia Ambientale e Geoingegneria, Consiglio Nazionale delle Ricerche, Monterotondo (RM), 00015, Italy

ABSTRACT

The two-phase, air-water flow pattern in a DynaWhirlpool-type centrifugal separator is investigated using time-dependent, three-dimensional numerical simulation. The air-water interface is captured by the volume-of-fluid approach, while the unresolved turbulence fluctuations are modeled via a second-order differential-stress turbulence model. The methodology is validated with available laser-Doppler data acquired on a similar separation device. The velocity field within the cyclone is thoroughly characterized for a single operating condition, revealing the presence of a stable air core that flows axially faster than the surrounding water.