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 carboxyl methyl cellulose (CMC) solutions.

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# Modeling and Experimental Investigation of Bubble Formation in Shear-Thinning Liquids

Mohamad Taghi Esfidani

,
Mohamad Taghi Esfidani

School of Mechanical Engineering,

Sharif University of Technology,

Tehran 1458889694, Iran

e-mail: mtesfidani@gmail.com

Sharif University of Technology,

Tehran 1458889694, Iran

e-mail: mtesfidani@gmail.com

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Mohammad Reza Oshaghi

,
Mohammad Reza Oshaghi

School of Mechanical Engineering,

Sharif University of Technology,

Tehran 1458889694, Iran

e-mail: mreza.oshaghi@gmail.com

Sharif University of Technology,

Tehran 1458889694, Iran

e-mail: mreza.oshaghi@gmail.com

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Hossein Afshin

,
Hossein Afshin

Associate Professor

School of Mechanical Engineering,

Sharif University of Technology,

Tehran 1458889694, Iran

e-mail: afshin@sharif.edu

School of Mechanical Engineering,

Sharif University of Technology,

Tehran 1458889694, Iran

e-mail: afshin@sharif.edu

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Bahar Firoozabadi

Bahar Firoozabadi

Professor

School of Mechanical Engineering,

Sharif University of Technology,

Tehran 1458889694, Iran

e-mail: firoozabadi@sharif.edu

School of Mechanical Engineering,

Sharif University of Technology,

Tehran 1458889694, Iran

e-mail: firoozabadi@sharif.edu

Search for other works by this author on:

Mohamad Taghi Esfidani

Sharif University of Technology,

Tehran 1458889694, Iran

e-mail: mtesfidani@gmail.com

Mohammad Reza Oshaghi

Sharif University of Technology,

Tehran 1458889694, Iran

e-mail: mreza.oshaghi@gmail.com

Hossein Afshin

School of Mechanical Engineering,

Sharif University of Technology,

Tehran 1458889694, Iran

e-mail: afshin@sharif.edu

Bahar Firoozabadi

School of Mechanical Engineering,

Sharif University of Technology,

Tehran 1458889694, Iran

e-mail: firoozabadi@sharif.edu

1

Corresponding author.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received May 14, 2016; final manuscript received February 5, 2017; published online April 24, 2017. Assoc. Editor: Kausik Sarkar.

*J. Fluids Eng*. Jul 2017, 139(7): 071302 (9 pages)

**Published Online:**April 24, 2017

Article history

Received:

May 14, 2016

Revised:

February 5, 2017

Citation

Taghi Esfidani, M., Reza Oshaghi, M., Afshin, H., and Firoozabadi, B. (April 24, 2017). "Modeling and Experimental Investigation of Bubble Formation in Shear-Thinning Liquids." ASME. *J. Fluids Eng*. July 2017; 139(7): 071302. https://doi.org/10.1115/1.4036158

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