Spinning and tumbling of long fibers in isotropic turbulence

Theresa B. Oehmke, Ankur D. Bordoloi, Evan Variano, and Gautier Verhille
Phys. Rev. Fluids 6, 044610 – Published 20 April 2021
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Abstract

We simultaneously measure both spinning and tumbling components of rotation for long near-neutrally buoyant fibers in homogeneous and isotropic turbulence. The lengths and diameters of the measured fibers extend to several orders of the Kolmogorov length of the surrounding turbulent flow. Our measurements show that the variance of the spinning rate follows a 4/3 power-law scaling with the fiber diameter (d) and is always larger than the variance of the tumbling rate. This behavior surprisingly resembles that observed previously for sub-Kolmogorov fibers. These observations suggest that long fibers preferentially align with vortex filaments that can be as long as the integral length of turbulence. We compute the Lagrangian timescale and the distribution of both tumbling and spinning that supports this outlook. Our measurements also allow us to quantify the importance of the Coriolis term on the rotational dynamics of fibers in turbulent flows.

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  • Received 16 November 2020
  • Accepted 23 March 2021

DOI:https://doi.org/10.1103/PhysRevFluids.6.044610

©2021 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

Theresa B. Oehmke1, Ankur D. Bordoloi1, Evan Variano1, and Gautier Verhille2,*

  • 1Department of Civil and Environmental Engineering, University of Berkeley CA 94720, USA
  • 2Aix Marseille Univ, CNRS, Centrale Marseille, IRPHE, F-13013 Marseille, France

  • *gautier.verhille@irphe.univ-mrs.fr

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Issue

Vol. 6, Iss. 4 — April 2021

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