Atomization of Non-Newtonian Fluids by Counterflow Atomizer
2022-05
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Atomization of Non-Newtonian Fluids by Counterflow Atomizer
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2022-05
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Abstract
The effects of shear-thinning non-Newtonian liquid on droplet diameter distributionsgenerated using a Counterflow atomizer were studied. Aqueous solutions of Sodium Carboxymethyl
cellulose (SCMC) salt of 0.5%, 1%, 1.5% and 2% by weight were considered
for experiments, with corresponding zero shear viscosity values of 13.8 mPas, 28.2 mPas,
508 mPas and 1280 mPas. Droplet diameters were measured using a Particle Digital
Image Analysis technique combined with diffuse back illuminated shadowgraphs. Flow
visualization in the near-field of the nozzle exit was used to gain insight into the flow patterns
inside the nozzle near the exit plane, and to explain far-field droplet distribution
statistics. Tree-like spray structure similar to effervescent atomization was observed
for test solutions with higher weight concentrations. During secondary atomization,
droplets connected with thin filaments were observed, indicating a probable existence of
extensional stresses in the fluid. At lower concentrations of solutions, the spray emerged
as a plume of droplets that are shed from a liquid film on the inner wall of the nozzle
discharge tube, accompanied by a gas core. The variation of the Sauter Mean Diameter
in the axial and radial directions indicated that the filaments in the near field are
sheared by the gas flow, and undergo secondary atomization, leading to small droplet
diameters and a more uniform distribution as we proceed downstream.
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University of Minnesota M.S. thesis. May 2022. Major: Mechanical Engineering. Advisor: Vinod Srinivasan. 1 computer file (PDF); viii, 81 pages.
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Band, Chinmayi. (2022). Atomization of Non-Newtonian Fluids by Counterflow Atomizer. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/241276.
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