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research-article

Modeling and experimental investigation of bubble formation in shear-thinning liquids

[+] Author and Article Information
Mohamad Taghi Esfidani

School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran
mtesfidani@gmail.com

Mohammad Reza Oshaghi

School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran
mreza.oshaghi@gmail.com

Hosein Afshin

Associate Professor School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran
afshin@sharif.edu

Bahar Firoozabadi

Professor School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran
firoozabadi@sharif.edu

1Corresponding author.

ASME doi:10.1115/1.4036158 History: Received May 14, 2016; Revised February 05, 2017

Abstract

This investigation presents both theoretical and experimental studies on the size of a growing bubble in power-law non-Newtonian liquids. At first, some previous works on the prediction of bubble size in Newtonian liquids have been extended by considering the balance of forces acting on the bubble at the moment of separation. Predicted bubble sizes were validated against the experimental results for a wide range of operating conditions, including different gas flow rates and needle diameters as well as a wide range of physical properties of the Newtonian liquids. Furthermore, in order to determine the size of the bubbles formed in power-law non-Newtonian liquids with a similar analysis, the effective shear rate of bubble growth was calculated in which the rheological properties of fluid were taken into account and subsequently the viscosity of the fluid was modified. Theoretically obtained bubble sizes for non-Newtonian liquids are in a good agreement with our experimental high-speed video observations of three CMC solutions.

Copyright (c) 2017 by ASME
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