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Influence of Design Parameters on the Air/Liquid Ratio of an Air Induction Nozzle

Published online by Cambridge University Press:  29 March 2017

F. Vashahi ,
S. Ra ,
Y. Choi  and
J. K. Lee
F. Vashahi
Affiliation:
Department of Mechanical System EngineeringChonbuk National UniversityJeonju, South Korea
S. Ra
Affiliation:
Department of Mechanical System EngineeringChonbuk National UniversityJeonju, South Korea
Y. Choi
Affiliation:
Rural Development AdministrationFarming Automation DivisionJeonju, South Korea
J. K. Lee*
Affiliation:
Division of Mechanical System EngineeringChonbuk National UniversityJeonju, South Korea
*
*Corresponding author ([email protected])
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Abstract

A two-phase flow parametric study on an air induction nozzle with water and air as the working fluids is presented. Liquid was supplied at the pre-orifice with various inlet pressures ranging from 3 to 6 bar. The interaction between air and water at the molecular level at the orifice exit leads to formation of a strong shear layer that is intensified with the increase in inlet pressure. Thus, it is vital to regulate the ratio of the intake air to the supplied liquid so that the generated micro bubbles fit the design criteria. CFD analysis was conducted using the commercial software STAR CCM+ from Siemens and validated against experimental data to investigate the design parameters and their effect on the ALR. A volume of fluid (VOF) method of the RANS models was used to undertake the air-water interaction. Parameters such as the throat, air orifice, and air inlet diameter, along with the diffuser angle, were investigated. It was found that certain parameters such as the throat diameter have a more significant effect on the air/liquid entrainment ratio than other parameters.

Keywords

Two-phase flowAir induction nozzle (AIN)ALRVOF model
Type
Research Article
Information
Journal of Mechanics , Volume 34 , Issue 3 , June 2018 , pp. 375 - 385
Copyright
Copyright © The Society of Theoretical and Applied Mechanics 2018 

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