Trajectory Analysis of Particle Motions in Superfluid Helium-4 Using PTV Method - Journal of Flow Control, Measurement & Visualization

JFCMV > Vol.10 No.2, April 2022

Journal of Flow Control, Measurement & Visualization

Volume 10, Issue 2 (April 2022)

ISSN Print: 2329-3322 ISSN Online: 2329-3330

Trajectory Analysis of Particle Motions in Superfluid Helium-4 Using PTV Method ()

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DOI: 10.4236/jfcmv.2022.102005 207 Downloads 763 Views Citations

Author(s)

Lizhu Chen, Yoshiyuki Tsuji^*

Affiliation(s)

Department of Energy Engineering and Science, Nagoya University, Nagoya, Japan.

ABSTRACT

This paper describes the use of particle tracking velocimetry to analyze the Lagrangian acceleration of small particles in superfluid helium with varying time increments,

. The probability density of acceleration exhibits Gaussian properties for

, but displays a lognormal distribution for

, where

is the migration time characterizing the particle motion. The particle trajectories are well characterized by the Hurst exponent H. For smaller time scales than

, the trajectories exhibit linear motion (), but have certain fractal properties with for time scales larger than

KEYWORDS

Superfluid, He II, Counterflow, Particle Tracking Velocimetry

Share and Cite:

Chen, L. and Tsuji, Y. (2022) Trajectory Analysis of Particle Motions in Superfluid Helium-4 Using PTV Method. Journal of Flow Control, Measurement & Visualization, 10, 76-85. doi: 10.4236/jfcmv.2022.102005.

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