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A Simplified Numerical Model for Axisymmetric Liquid Jet Breakup
Author Info
Dani, Abhijit R
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406880369
Abstract Details
Year and Degree
2014, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
Abstract
A numerical investigation of breakup of an infinite liquid jet of circular cross section subjected to air flow is presented in this thesis. Low Weber number (We < 110) jets are considered to undergo an axisymmetric breakup process. The governing equations of mass and momentum conservation are simplified and are solved using a fully explicit forward marching central difference numerical scheme. The effects of inertia, viscous and surface tension force on jet stability are studied by varying jet Weber number from 0 to 110 and Ohnesorge number from 0 to 1. Newtonian liquids as well as non-Newtonian aqueous polymeric solutions (purely viscous and viscoelastic) are considered. Non-Newtonian viscosities of liquids are modelled using asymptotic power law model and viscoelastic behavior is represented by Jeffery’s model. Also, the jet breakup behavior of aqueous surfactant solutions is investigated by incorporating a dynamic surface tension variation. The numerical model is validated with experimental data and theoretical/numerical studies available in the literature. The results from the numerical model show that the disturbance growth rate is directly proportional to the initial disturbance amplitude. An increase in Ohnesorge number causes a reduction in the growth rate and the dominant wave number. For aqueous polymeric solutions, an increase in polymer concentration leads to reduction in growth rate and increase in breakup time. Viscoelastic fluids exhibit lower growth rates than Newtonian liquids for the same Weber number. Dynamic variation of surface tension in surfactant solutions slows down the breakup process and decreases the disturbance growth rate.
Committee
Milind Jog, Ph.D. (Committee Chair)
Raj Manglik, Ph.D. (Committee Member)
Kumar Vemaganti, Ph.D. (Committee Member)
Pages
85 p.
Subject Headings
Engineering
Keywords
jet breakup
;
instability
;
capillary breakup
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Citations
Dani, A. R. (2014).
A Simplified Numerical Model for Axisymmetric Liquid Jet Breakup
[Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406880369
APA Style (7th edition)
Dani, Abhijit.
A Simplified Numerical Model for Axisymmetric Liquid Jet Breakup.
2014. University of Cincinnati, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406880369.
MLA Style (8th edition)
Dani, Abhijit. "A Simplified Numerical Model for Axisymmetric Liquid Jet Breakup." Master's thesis, University of Cincinnati, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406880369
Chicago Manual of Style (17th edition)
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Document number:
ucin1406880369
Download Count:
645
Copyright Info
© 2014, some rights reserved.
A Simplified Numerical Model for Axisymmetric Liquid Jet Breakup by Abhijit R Dani is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.