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Title: Smoothed dissipative particle dynamics model for mesoscopic multiphase flows in the presence of thermal fluctuations

Abstract

Thermal fluctuations cause perturbations of fluid-fluid interfaces and highly nonlinear hydrodynamics in multiphase flows. In this work, we develop a novel multiphase smoothed dissipative particle dynamics model. This model accounts for both bulk hydrodynamics and interfacial fluctuations. Interfacial surface tension is modeled by imposing a pairwise force between SDPD particles. We show that the relationship between the model parameters and surface tension, previously derived under the assumption of zero thermal fluctuation, is accurate for fluid systems at low temperature but overestimates the surface tension for intermediate and large thermal fluctuations. To analyze the effect of thermal fluctuations on surface tension, we construct a coarse-grained Euler lattice model based on the mean field theory and derive a semi-analytical formula to directly relate the surface tension to model parameters for a wide range of temperatures and model resolutions. We demonstrate that the present method correctly models the dynamic processes, such as bubble coalescence and capillary spectra across the interface.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1340818
Report Number(s):
PNNL-SA-114207
Journal ID: ISSN 2470-0045; PLEEE8; KJ0401000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review E; Journal Volume: 94; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; smoothed dissipative particle dynamics; surface tension; fluctuations

Citation Formats

Lei, Huan, Baker, Nathan A., Wu, Lei, Schenter, Gregory K., Mundy, Christopher J., and Tartakovsky, Alexandre M. Smoothed dissipative particle dynamics model for mesoscopic multiphase flows in the presence of thermal fluctuations. United States: N. p., 2016. Web. doi:10.1103/PhysRevE.94.023304.
Lei, Huan, Baker, Nathan A., Wu, Lei, Schenter, Gregory K., Mundy, Christopher J., & Tartakovsky, Alexandre M. Smoothed dissipative particle dynamics model for mesoscopic multiphase flows in the presence of thermal fluctuations. United States. doi:10.1103/PhysRevE.94.023304.
Lei, Huan, Baker, Nathan A., Wu, Lei, Schenter, Gregory K., Mundy, Christopher J., and Tartakovsky, Alexandre M. 2016. "Smoothed dissipative particle dynamics model for mesoscopic multiphase flows in the presence of thermal fluctuations". United States. doi:10.1103/PhysRevE.94.023304.
@article{osti_1340818,
title = {Smoothed dissipative particle dynamics model for mesoscopic multiphase flows in the presence of thermal fluctuations},
author = {Lei, Huan and Baker, Nathan A. and Wu, Lei and Schenter, Gregory K. and Mundy, Christopher J. and Tartakovsky, Alexandre M.},
abstractNote = {Thermal fluctuations cause perturbations of fluid-fluid interfaces and highly nonlinear hydrodynamics in multiphase flows. In this work, we develop a novel multiphase smoothed dissipative particle dynamics model. This model accounts for both bulk hydrodynamics and interfacial fluctuations. Interfacial surface tension is modeled by imposing a pairwise force between SDPD particles. We show that the relationship between the model parameters and surface tension, previously derived under the assumption of zero thermal fluctuation, is accurate for fluid systems at low temperature but overestimates the surface tension for intermediate and large thermal fluctuations. To analyze the effect of thermal fluctuations on surface tension, we construct a coarse-grained Euler lattice model based on the mean field theory and derive a semi-analytical formula to directly relate the surface tension to model parameters for a wide range of temperatures and model resolutions. We demonstrate that the present method correctly models the dynamic processes, such as bubble coalescence and capillary spectra across the interface.},
doi = {10.1103/PhysRevE.94.023304},
journal = {Physical Review E},
number = 2,
volume = 94,
place = {United States},
year = 2016,
month = 8
}
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