Atomization of Non-Newtonian Fluids by Counterflow Atomizer
2022-05
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Atomization of Non-Newtonian Fluids by Counterflow Atomizer
Authors
Published Date
2022-05
Publisher
Type
Thesis or Dissertation
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.
Description
University of Minnesota M.S. thesis. May 2022. Major: Mechanical Engineering. Advisor: Vinod Srinivasan. 1 computer file (PDF); viii, 81 pages.
Related to
Replaces
License
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
Band, Chinmayi. (2022). Atomization of Non-Newtonian Fluids by Counterflow Atomizer. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/241276.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.