Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session ZC36: Micro/Nano scale Flows: Multiphase
12:50 PM–2:47 PM,
Tuesday, November 21, 2023
Room: 202B
Chair: Ulf Schiller, University of Delaware
Abstract: ZC36.00003 : Nonequilibrium velocity distribution of evaporating water molecules: Molecular beam measurement and its impact on the fluid dynamics boundary conditions at a liquid-vapor interface*
1:16 PM–1:29 PM
Presenter:
Ikuya Kinefuchi
(Univ of Tokyo)
Author:
Ikuya Kinefuchi
(Univ of Tokyo)
Recently, we developed an experimental setup to measure the velocity distribution of evaporating water molecules from a liquid-vapor interface, which is kept in a vacuum using a nanoporous membrane. This setup enabled measuring the nonequilibrium velocity distribution by suppressing molecular collisions after evaporation and showed that the velocity distribution slightly deviates from the Maxwell-Boltzmann distribution. The velocity distribution of evaporating molecules contains a smaller amount of slow molecules and a larger amount of fast molecules than the Maxwell-Boltzmann distribution. This result is consistent with the previously reported molecular dynamics simulations.
In this presentation, we discuss how the deviation from the Maxwell-Boltzmann distribution impacts the boundary conditions applied for a liquid-vapor interface in macroscopic flow analyses in light of our recent experimental results.
*This work is supported by JSPS KAKENHI Grant Numbers JP23H01338 and JP20H02062.
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