Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session G00: Poster Session I (2pm- 5pm CST)
2:00 PM,
Tuesday, March 15, 2022
Room: McCormick Place Exhibit Hall F1
Abstract: G00.00371 : Investigating multiscale empirical mode decomposition of density fluctuation near critical point of SF6*
Presenter:
David Dorf
(College of Charleston)
Authors:
David Dorf
(College of Charleston)
Ana Oprisan
(College of Charleston)
Sorinel Oprisan
(College of Charleston)
Dereck Morgado
(College of Charleston)
Seth Zoppelt
(College of Charleston)
Carole Lecoutre
(College of Charleston)
Yves Garrabos
(Univ. Bordeaux, ICMCB)
Daniel Beysens
(Laboratoire de Physique et Mécanique des Milieux Hétérogènes)
Collaborations:
Laboratoire de Physique et Mécanique des Milieux Hétérogènes, College of Charleston, University of Bordeaux, ICMCB
sulfur hexafluoride (SF6) in microgravity. The multiple spatial and temporal fluctuations can be
effectively separated using the Bidimensional Empirical Mode Decomposition (BEMD)
technique. The resulting orthogonal decompositions for each spatial scale are represented by an
Intrinsic Mode Function (IMF) image. The thermophysical properties for each spatial scale were
extracted using the Dynamic Differential Microscopy (DDM), which allows the structure factor's
computation and the intermediate scattering function (ISF) of critical fluid. The ISF gives the
correlation time of fluctuation, which determines the thermal diffusion coefficient. Using these
image processing methods, we found the thermal diffusivity coefficient above the critical
temperature and effective diffusion coefficients below the critical temperature.
*Funding for the College of Charleston was from the SC Palmetto Academy and Department of Physics and Astronomy of the College of Charleston.CNES supported research from the team in France.
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