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Article Dans Une Revue Physics of Fluids Année : 2022

Oscillation dynamics of the air-core in a hydrocyclone

Résumé

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.
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Dates et versions

hal-04221091 , version 1 (28-09-2023)

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Chandranath Banerjee, Kaustav Chaudhury, Emmanuel Cid, Florent Bourgeois, Suman Chakraborty, et al.. Oscillation dynamics of the air-core in a hydrocyclone. Physics of Fluids, 2022, 34 (9), ⟨10.1063/5.0099985⟩. ⟨hal-04221091⟩
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