Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


22222.pdf (3.42 MB)

ETD Abstract Container

Abstract Header

Computational Study of Internal Two Phase Flow in Effervescent Atomizer in Annular Flow Regime

Mohapatra, Chinmoy Krushna
http://orcid.org/0000-0003-1464-5208
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470741568

Abstract Details

2016, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
Effervescent atomizers are being used in a variety of industrial applications including pharmaceutical, agricultural, and spray coating as well as combustion engines because they provide good spray performance at lower inlet pressures and over a wide range of operating conditions. To improve spray characteristics of effervescent atomizers, understanding their internal flow dynamics is critical. To this end, computational simulations of transient, two phase flow in an effervescent atomizer have been carried out. The Volume of Fluid (VOF) method has been used track the gas-liquid interface in axisymmetric effervescent atomizer geometry for a laminar, annular flow regime. Gas to liquid mass flow ratio or GLR has been varied and the corresponding liquid thickness at the exit orifice has been determined. Water has been chosen as the liquid and air as the atomizing gas. The GLR has been varied from 0.005 to 0.07 and the corresponding liquid flow rate between 0.14 l/min and 0.27 l/min. At a constant liquid flow rate, an increase in GLR decreases the liquid sheet thickness, which will reduce the Sauter Mean Diameter (SMD). Furthermore, an increase in liquid flow rate increases the sheet thickness. Additionally, the effect of varying GLR on the spray momentum flux has also been studied. The jet momentum flux controls the spray penetration distance and entrainment characteristics. Jet momentum flux is found to increase almost linearly with increasing GLR. The effects of atomizer geometrical parameters such as nozzle orifice diameter and orifice length as well as the effect of swirl on atomizer internal flow characteristics have been delineated. Correlations have been proposed for the dimensionless sheet thickness and the momentum flux ratio as a function of GLR and the superficial Reynolds number.
Milind Jog, Ph.D. (Committee Chair)
Raj Manglik, Ph.D. (Committee Member)
Samir Tambe, Ph.D. (Committee Member)
94 p.
Mechanical Engineering; Mechanics
Effervescent Atomizer; OpenFOAM; Sheet thickness; CFD; GLR; Momentum flux ratio

Recommended Citations

Citations

  • Mohapatra, C. K. (2016). Computational Study of Internal Two Phase Flow in Effervescent Atomizer in Annular Flow Regime [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470741568

    APA Style (7th edition)

  • Mohapatra, Chinmoy Krushna. Computational Study of Internal Two Phase Flow in Effervescent Atomizer in Annular Flow Regime. 2016. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470741568.

    MLA Style (8th edition)

  • Mohapatra, Chinmoy Krushna. "Computational Study of Internal Two Phase Flow in Effervescent Atomizer in Annular Flow Regime." Master's thesis, University of Cincinnati, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470741568

    Chicago Manual of Style (17th edition)

ucin1470741568
1,282
© 2016, some rights reserved.Creative Commons License Computational Study of Internal Two Phase Flow in Effervescent Atomizer in Annular Flow Regime by Chinmoy Krushna Mohapatra is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.