2024-03-29T15:13:11Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:02003802
2023-01-16T04:10:36Z
320:321:322
Statistical Properties of Small Particle Trajectories in a Fully Developed Turbulent State in He-II
Kubo, Wataru
Tsuji, Yoshiyuki
open access
This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s10909-019-02192-9
Lagrangian velocity
Particle size
PTV measurement
Lagrangian trajectories of small particles in a fully developed turbulent state are studied in a rectangular duct. A plate heater is attached on the bottom to generate the thermal counter flow. The bath temperature is changed from 1.7 to 2.1 K and is controlled within 0.1 mK. Small particles made of solid hydrogen are visualized by high-speed camera, and their trajectories are recorded. Their motions indicate complex features depending not only on bath temperature and heater power, but also on particle size. In this study, the Hurst exponent is defined by |x(t+τ)−x(t)|∝τ^H, where x(t) denotes the particle position at time t. It was found that there is a characteristic timescale τ0. For small time separation, τ≤τ0, the exponent H is small. However, for large time separation, τ0≪τ, H is nearly 1.
Springer
2022-09-20
2019-07-15
eng
journal article
AM
http://hdl.handle.net/2237/0002003802
https://nagoya.repo.nii.ac.jp/records/2003802
https://doi.org/10.1007/s10909-019-02192-9
0022-2291
Journal of Low Temperature Physics
196
1-2
170
176
https://nagoya.repo.nii.ac.jp/record/2003802/files/Kubo_2019_Statistical_property_of_small_particle_trajectories_in_fully_developed_turbulent_state_of_HeII.pdf
application/pdf
725 KB
2022-09-20