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research-article

STUDY OF A CAVITATING VENTURI TUBE BY LUMPED PARAMETERS

[+] Author and Article Information
Samuel Cruz

Facultad de Ingeniería; Universidad Nacional Autónoma de México, Circuito Escolar s/n, Ciudad Universitaria, Delegación Coyoacán, México CDMX, 04510
samisam98@hotmail.com

Francisco A. Godínez

Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito Escolar s/n, Ciudad Universitaria, Delegación Coyoacán, México CDMX, 04510; Polo Universitario de Tecnología Avanzada, Universidad Nacional Autónoma de México, Vía de la Innovación No. 410, Autopista Monterrey-Aeropuerto km. 10 PIIT, C.P. 66629, Apodaca Nuevo León, México
fgodinezr@gmail.com

Margarita Navarrete

Instituto de Ingeniería, Universidad Nacional Autónoma de México, Circuito Escolar s/n, Ciudad Universitaria, Delegación Coyoacán, México CDMX, 04510
mnm@pumas.iingen.unam.mx

1Corresponding author.

ASME doi:10.1115/1.4042375 History: Received April 05, 2018; Revised December 19, 2018

Abstract

The hydrodynamic cavitation in a Venturi tube is studied both theoretically and experimentally. A lumped parameters model was developed to describe the accumulation and dissipation of energy in the biphasic flow as a function of the bubbles population characteristics (mean volume, standard deviation and void fraction). Resistance, capacitance, inductance and frequency lumped-parameters were identified applying the fluid conservation equations (mass and momentum) along with electrical/hydraulic analogies. Experiments with 1,2-propanediol were carried out in a hydraulic circuit composed of valves, a pump and a Venturi nozzle. The acoustic noise generated (at different cavitation regimes) by the passage of the fluid through the tube was acquired with a piezoelectric sensor. After processing the experimental signals, the system frequency at each operation condition was determined. Plausible estimations of the void fraction were obtained at different experimental frequencies by evaluating a theoretical expression of the frequency lumped-parameter. This semi-empirical technique might be a low-cost alternative when the void fraction of a flow needs to be determined and tomography devices are not available.

Copyright (c) 2018 by ASME
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