Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session T11: Flow of Complex Fluids, Rheology Structures and Instabilities II
11:30 AM–1:42 PM,
Thursday, March 17, 2022
Room: McCormick Place W-181B
Sponsoring Unit: DFD
Chair: Manish Kumar, Purdue
Abstract: T11.00006 : Surface tension of cavitation bubbles*
12:30 PM–12:42 PM
We report on the cavitation of nitrogen and helium in a wide temperature range. The pressure threshold for cavitation is consistent with classical nucleation theory. However, at low temperature, the threshold is slightly higher than predicted. This shift is usually attributed to a decrease of the surface tension with the curvature of the liquid-vapor interface. In this interpretation, we find that the surface tension is reduced by 20% when the radius of the critical bubble is about 1 nm, a value consistent with experimental results in bulk superheated nitrogen.
Taking advantage of the huge number of independent pores, we have measured the nucleation rate for nitrogen as a function of the pressure in the vicinity of the cavitation threshold. This allows us to determine the correction to the surface tension up to second order in curvature for temperatures in the range 65 - 100 K. Such measurements in a simple liquid open the route to testing precisely theoretical models for curved liquid-vapor interfaces2.
1. V. Doebele, et al, Phys. Rev. Lett. 125 (2020) 255701.
2. N. Bruot, F. Caupin, Phys. Rev. Lett. 116 (2016), 056102.
*This work, including the funding of M. Bossert has been financially supported by Agence Nationale de la Recherche through the project CavConf, ANR-17-CE30-0002.
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