Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session P38: Materials in Extremes: Complex Systems
2:30 PM–5:18 PM,
Wednesday, March 7, 2018
LACC
Room: 501A
Sponsoring
Units:
DCOMP GSCCM DMP
Chair: Harry Radousky, Lawrence Livermore National Laboratory
Abstract ID: BAPS.2018.MAR.P38.1
Abstract: P38.00001 : Dynamics of supercritical fluids: Theory and simulations
2:30 PM–3:06 PM
Presenter:
Taras Bryk
(Institute for Condensed Matter Physics of NASU)
Authors:
Taras Bryk
(Institute for Condensed Matter Physics of NASU)
Ihor Mryglod
(Institute for Condensed Matter Physics of NASU)
Giancarlo Ruocco
(Center for Life Nano Science @Sapienza, Istituto Italiano di Tecnologia)
Tullio Scopigno
(Dipartimento di Fisica, Universita di Roma La Sapienza)
We present a theory of PSD in fluids based on thermo-viscoelastic model of generalized hydrodynamics [3]. The developed theory allows to recover density/pressure dependence of PSD observed in X-ray scattering experiments [1] and simulations[2,3]. The analysis of different contributions to PSD reveals that the contribution from heat processes reduces the PSD and when getting closer to the critical point it can result in even "negative sound dispersion".
A comparison of the developed theory with another approach to the dynamics of supercritical fluids connected with so-called "Frenkel line" will be discussed [4]. In particular, the dispersion of longitudinal and transverse collective excitations will be compared as obtained from the two theoretical approaches.
[1] Simeoni, G.; Bryk, T.; Gorelli, F. A.; Krisch, M.; Ruocco, G.; Santoro, M.; Scopigno, T. Nat. Phys. vol.6, p.503 (2010).
[2] Gorelli, F. A.; Bryk, T.; Krisch, M.; Ruocco, G.; Santoro, M.; Scopigno, T. Sci. Rep. vol. 3, 1203 (2013).
[3] Bryk, T., Mryglod, I., Scopigno, T., Ruocco, G., Gorelli, F., Santoro, M. J.Chem. Phys. vol.133, 024502 (2010)
[4] Bryk, T., Gorelli, F., Mryglod, I., Ruocco, G., Santoro, M., Scopigno, T. J.Phys.Chem. Lett. vol.8, p.4995 (2017)
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.P38.1
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