Nonthermal ice nucleation observed at distorted contact lines of supercooled water drops
- Michigan Technological Univ., Houghton, MI (United States). Dept. of Physics and Atmospheric Sciences Program; Brookhaven National Lab. (BNL), Upton, NY (United States)
- Michigan Technological Univ., Houghton, MI (United States). Dept. of Physics
- Michigan Technological Univ., Houghton, MI (United States). Dept. of Biomedical Engineering
- Michigan Technological Univ., Houghton, MI (United States). Dept. of Physics and Atmospheric Sciences Program
Ice nucleation is the crucial step for ice formation in atmospheric clouds and therefore underlies climatologically relevant precipitation and radiative properties. Some progress has been made in understanding the roles of temperature, supersaturation, and material properties, but an explanation for the efficient ice nucleation occurring when a particle contacts a supercooled water drop has been elusive for over half a century. Here, we explore ice nucleation initiated at constant temperature and observe that mechanical agitation induces freezing of supercooled water drops at distorted contact lines. Results show that symmetric motion of supercooled water on a vertically oscillating substrate does not freeze, no matter how we agitate it. However, when the moving contact line is distorted with the help of trace amounts of oil or inhomogeneous pinning on the substrate, freezing can occur at temperatures much higher than in a static droplet, equivalent to ~1010 increase in nucleation rate. Several possible mechanisms are proposed to explain the observations. One plausible explanation among them, decreased pressure due to interface curvature, is explored theoretically and compared with the observational results quasiquantitatively. Indeed, the observed freezing-temperature increase scales with contact line speed in a manner consistent with the pressure hypothesis. Whatever the mechanism, the experiments demonstrate a strong preference for ice nucleation at three-phase contact lines compared to the two-phase interface, and they also show that movement and distortion of the contact line are necessary contributions to stimulating the nucleation process.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)
- Grant/Contract Number:
- SC0012704; SC0011690; AGS-1639868
- OSTI ID:
- 1424988
- Alternate ID(s):
- OSTI ID: 1419697
- Report Number(s):
- BNL-203309-2018-JAAM; PLEEE8; TRN: US1801989
- Journal Information:
- Physical Review E, Vol. 97, Issue 2; ISSN 2470-0045
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Temperature-gradient effects on heterogeneous ice nucleation from supercooled water
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journal | December 2019 |
Rapid freezing of water under dynamic compression
|
journal | May 2018 |
Is Contact Nucleation Caused by Pressure Perturbation?
|
journal | December 2019 |
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