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Numerical Study of the Fluid Flow in a Cylindrical Hydrocyclone Separator

[+] Author Affiliations
Hans E. Maldonado Ninahuanca, Henrique Stel, Rigoberto E. M. Morales

Federal University of Technology – Paraná, Curitiba, Paraná, Brazil

Paper No. IMECE2014-39561, pp. V007T09A049; 11 pages
doi:10.1115/IMECE2014-39561
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 7: Fluids Engineering Systems and Technologies
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4954-5
  • Copyright © 2014 by ASME

abstract

This work presents a numerical study on the flow inside a gas-liquid cylindrical hydrocyclone separator. This equipment operates with a free-surface liquid film flow, which is a combination of a centrifugal and a gravitational movement originated by a tangential nozzle. The computational package ANSYS-CFX was employed to simulate the flow using an inhomogeneous Eulerian-Eulerian multiphase flow model with the free surface approach to capture the phases interface. Fluid dynamics is examined for a range of fluid viscosities and flow rates for a single-phase liquid flow at the inlet. The results of the simulations provided basis for the development of a compact mechanistic model for calculating velocity components, film thickness and other variables. This model was derived by analyzing the motion of a fluid element and then by including additional terms that represent the sudden expansion of the flow at the inlet of the cylindrical chamber. Then, the terms included and some model coefficients were calibrated using the numerical results. The outcomes of this work can be used to predict the flow dynamics in a hydrocyclone, which is a fundamental step for more complex evaluations such as estimating the separation efficiency and developing new constructive concepts for the equipment.

Copyright © 2014 by ASME
Topics: Fluid dynamics

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