Journal article
Probing the temperature profile across a liquid-vapor interface upon phase change
The Journal of chemical physics, v 153(14), pp 144706-144706
14 Oct 2020
PMID: 33086805
Abstract
Understanding the temperature profile across a liquid-vapor interface in the presence of phase change is essential for the accurate prediction of evaporation, boiling, and condensation. It has been shown experimentally, from non-equilibrium thermodynamics and using molecular dynamics simulations, the existence of an inverted temperature profile across an evaporating liquid-vapor interface, where the vapor-side interface temperature observes the lowest value and the vapor temperature increases away from the interface, opposite to the direction of heat flow. It is worth noting, however, that an inverted temperature profile is not always the case from other experiments and simulations. In this study, we apply non-equilibrium molecular dynamics simulations to systematically study the temperature profile across a liquid-vapor interface during phase change under various heat fluxes in a two-interface setting consisting of both an evaporating and a condensing interface. The calculated vapor temperature shows different characteristics inside the Knudsen layer and in the bulk vapor. In addition, both the direction and magnitude of the vapor temperature gradient, as well as the temperature jump at the liquid-vapor interface, are functions of the applied heat flux. The interfacial entropy generation rate calculated from the vibrational density of state of the interfacial liquid and vapor molecules shows a positive production during evaporation, and the results qualitatively agree with the predictions from non-equilibrium thermodynamics.
Metrics
Details
- Title
- Probing the temperature profile across a liquid-vapor interface upon phase change
- Creators
- Arif Rokoni - Drexel UniversityYing Sun - Drexel University
- Publication Details
- The Journal of chemical physics, v 153(14), pp 144706-144706
- Publisher
- American Institute of Physics
- Number of pages
- 16
- Grant note
- TG-CTS110056 / Extreme Science and Engineering Discovery Environment (XSEDE) CBET-1357918 / U.S. National Science Foundation; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Mechanical Engineering and Mechanics; College of Engineering
- Web of Science ID
- WOS:000582113000006
- Scopus ID
- 2-s2.0-85094151582
- Other Identifier
- 991019167517304721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Physics, Atomic, Molecular & Chemical