Oscillation dynamics of the air-core in a hydrocyclone

Tangential introduction of liquid results in a swirling flow within a cylindro-conical hydrocyclone. Upon continuous feeding with water, the central axial region experiences local low pressure across the height yielding the formation of an air-core, which executes meandering motion similar to the os...

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Bibliographic Details
Published in:Physics of fluids (1994) 2022-09, Vol.34 (9)
Main Authors: Banerjee, Chandranath, Chaudhury, Kaustav, Cid, Emmanuel, Bourgeois, Florent, Chakraborty, Suman, Majumder, Arun, Climent, Eric
Format: Article
Language:English
Subjects:
Chemical engineering
Chemical Sciences
Conical flow
Elastic beams
Flow simulation
Food engineering
Hydrocyclones
Life Sciences
Low pressure
Multiphase flow
Reynolds stress
Swirling
Water flow
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Summary:Tangential introduction of liquid results in a swirling flow within a cylindro-conical hydrocyclone. Upon continuous feeding with water, the central axial region experiences local low pressure across the height yielding the formation of an air-core, which executes meandering motion similar to the oscillation of an elastic string. We investigated the vortical flow and the induced oscillating behavior of an air column submerged in a water flow field inside a hydrocyclone. Through a series of experiments in a transparent hydrocyclone and subsequent full scale multiphase flow simulations with the Reynolds stress model, we analyzed the morphological characteristics of the air-core (mean and fluctuating properties). Air-core oscillations are characterized in terms of spatial wavelength and frequency. We show that hydrodynamics driven oscillating behavior of the air-core shares an analogy with the vibration of an elastic beam. Following this analogy, we obtain a scaling relationship between the wavelength and air-core radius, which is in good agreement with our experimental data and numerical results.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0099985