Sustaining mechanism of small-scale turbulent eddies in a precessing sphere

Horimoto, Yasufumi; Goto, Susumu

Physical Review Fluids, 2017, 2(11), 114603

Number of Access:18（2025-04-27 15:02 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/100048

Link to primary information 

File Format Terms of use Size Views Date.Available Description information
PhysRevFluids_2_11_114603 pdf None 2.96 MB 19 2025.01.27  

Item Information

Output File Export EndNote Basic Export Mendeley

Title
Sustaining mechanism of small-scale turbulent eddies in a precessing sphere
Creator
NRID
1000060822525 1000060822525
CreatorName
Horimoto, Yasufumi
NRID
1000040321616 1000040321616
ORCID
0000-0001-7013-7967 0000-0001-7013-7967
researchmap permalink
read0193841 read0193841
Scopus Author ID
56040611400 56040611400
CreatorName
Goto, Susumu
Description
Horimoto Y., Goto S. Sustaining mechanism of small-scale turbulent eddies in a precessing sphere. Physical Review Fluids 2, 114603 (2017); https://doi.org/10.1103/PhysRevFluids.2.114603.
Abstract
It has been known for a long time that fully developed turbulence is sustained in a precessing container. The aim of the present study is to reveal the sustaining mechanism of turbulence in a precessing sphere by means of laboratory experiments. We conduct experiments using a Newtonian fluid (water) and viscoelastic fluids (dilute solutions of surfactant, cetyltrimethyl ammonium chloride, and polymers, polyethylene oxide) to understand the sustaining mechanism of turbulence of Newtonian fluids by examining turbulence modifications due to the surfactant and polymer additives. When the Reynolds number based on the spin angular velocity and radius of the sphere is fixed, the most developed turbulence is sustained with the Poincaré number (the precession rate) being about 0.1. The key ingredient of the developed turbulence is a pair of large-scale vortex tubes which robustly exists in the flow. Assuming that these vortex tubes sustain small-scale turbulent eddies through an energy cascading process, we can explain all our experimental observations. Concerning the turbulence modification by the additives, the time-scale criteria by Lumley [J. Polymer Sci.: Macromol. Rev. 7, 263 (1973)] and the refined theory by Tabor and de Gennes [Europhys. Lett. 2, 519 (1986)] explain the experimental result that the pair of large-scale vortex tubes survives even when small-scale turbulent eddies are drastically suppressed by the surfactant additive.
Publisher
American Physical Society
Source Title
Physical Review Fluids
Volume (Issue)
2(11)
Page
114603
Date of Issued
2017-11-10
Language
English
Handle URL
https://hdl.handle.net/11094/100048
eISSN
2469990X
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1103/PhysRevFluids.2.114603
Access Rights
open access
CopyRight
Copyright 2017 by the American Physical Society
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article