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Fluid demixing kinetics on spherical geometry: power spectrum and Minkowski functional analysis

Böbel, Alexander and Bott, Matthias and Modest, Heike and Brader, J. M. and Räth, Christoph (2019) Fluid demixing kinetics on spherical geometry: power spectrum and Minkowski functional analysis. New Journal of Physics, 21, 013031. Institute of Physics (IOP) Publishing. doi: 10.1088/1367-2630/aaf8d0. ISSN 1367-2630.

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Official URL: https://iopscience.iop.org/article/10.1088/1367-2630/aaf8d0/meta


Dynamic density functional theory calculations of fluid–fluid demixing on spherical geometries are characterized via their angular power spectrum as well as via the Minkowski functionals (MFs) of their binarized fluid density fields. MFs form a complete set of additive, motion invariant and continuous morphological measures sensitive to nonlinear (spatial) correlations. The temporal evolution of the fluid density fields is analyzed for different sphere sizes and mixing compositions. The demixing process in the stages of early spinodal decomposition and consecutive domain growth can be characterized by both methods and a power-law domain growth L( ) t t µ a is evidenced for the MF measures. The average domain size obtained by the structure factor only responds to the late stage domain growth of the demixing process. MFs provide refined insights into the demixing process: they allow the detection of distinct stages in the early spinodal decomposition, provide a precise measure of the relative species composition of the mixture and, most importantly: after a proper rescaling, they allow the detection of a universal demixing behavior for a wide range of mixture fractions and for different sphere sizes.

Item URL in elib:https://elib.dlr.de/127152/
Document Type:Article
Title:Fluid demixing kinetics on spherical geometry: power spectrum and Minkowski functional analysis
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bott, MatthiasUniversity of Fribourg, SwitzerlandUNSPECIFIEDUNSPECIFIED
Brader, J. M.University of Fribourg, SwitzerlandUNSPECIFIEDUNSPECIFIED
Date:January 2019
Journal or Publication Title:New Journal of Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:013031
Publisher:Institute of Physics (IOP) Publishing
Keywords:fluid demixing, power spectrum, Minkowski functionals, sphere, spinodal decomposition, universality
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Komplexe Plasmen / Data analysis (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Räth, Christoph
Deposited On:15 Apr 2019 08:01
Last Modified:22 Jul 2019 11:12

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