Title: Modeling and Experimental Investigation of Bubble Formation in Shear-Thinning Liquids
Journal: Journal of Fluids Engineering
Author: 1. Mohamad Taghi Esfidani, Mohammad Reza Oshaghi, Hossein Afshin, Bahar Firoozabadi
Address: 1. School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran.
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.
Keywords: Bubble formation, shear-thinning liquid, Bubble size, Effective shear rate, Mathematical
modeling, High-speed camera
Application: Fluid Mechanics
Product Model 1: Syringe Pump (SP1000HOM)
Product Model 2:
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