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Prediction of the Effects of Surface Wettability on Droplet-Dry Substrate Splashing

Owen, Matthew K
http://orcid.org/0000-0001-7012-4453
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504873200334222

Abstract Details

2017, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
The evaporation of chemicals can result in vapors in the air. In work environments where they could be inhaled, these can pose negative short term or long term health effects. The splashing of a droplet after impacting a dry surface can result in formation of small liquid particles which may evaporate in air. To minimize and better control splashing in future situations, understanding properties that enable or enhance to splash is important. To this end, the relationship between wettability and the behavior of secondary droplets has been computationally determined in this Master’s Thesis using OpenFOAM. The computational results are validated against experimental measurements reported in the literature. Then test cases of droplets of diameters between of 2.7 mm and impact velocities between 1.0-2.75 ms-1 with varying surface tensions, densities, and kinematic viscosities are run. The dynamic contact angles between the substrate and impinging droplet range between 20 and 160 degrees while the Reynolds number varies from 1800 to 20000, the Weber number ranges from 50 to 5000, the Capillary number ranges from 0.04 to 0.07, and the Euler number between 350 to 1100. Resulting predicted splashing behaviors such as coronas and fragments are described. Findings include that with increasing wettability or hydrophobicity, an increase in the number of secondary droplets occur. The angle from which the secondary droplet is ejected increases as well. Droplets which impact at 2.75 meters per second and have a Capillary number of less than 0.1 are seen to be the most prolific splashers. When the viscosity is changed, it is shown to have a direct effect on how much splashing occurs.
Milind Jog, Ph.D. (Committee Chair)
Jay Kim, Ph.D. (Committee Member)
Jurate Virkutyte, Ph.D. (Committee Member)
119 p.
Mechanical Engineering
wettability; droplet; splash; safety

Recommended Citations

Citations

  • Owen, M. K. (2017). Prediction of the Effects of Surface Wettability on Droplet-Dry Substrate Splashing [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504873200334222

    APA Style (7th edition)

  • Owen, Matthew. Prediction of the Effects of Surface Wettability on Droplet-Dry Substrate Splashing. 2017. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504873200334222.

    MLA Style (8th edition)

  • Owen, Matthew. "Prediction of the Effects of Surface Wettability on Droplet-Dry Substrate Splashing." Master's thesis, University of Cincinnati, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504873200334222

    Chicago Manual of Style (17th edition)

ucin1504873200334222
443
© 2017, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.