Dynamics of finite-sized light spheres in turbulence

Varghese Mathai; Vivek Prakash; Jon Brons; Chao Sun; Detlef Lohse

Dynamics of finite-sized light spheres in turbulence

Varghese Mathai, Vivek Prakash, Jon Brons, Chao Sun, Detlef Lohse

Physics of Fluids

Research output: Contribution to conference › Paper › peer-review

Abstract

We report experimental results on the Lagrangian dynamics of finite-size light particles in turbulence. Using an orthogonal camera setup and 3D particle tracking, we study the velocity and acceleration statistics of rigid light spheres in a water tunnel with nearly homogeneous and isotropic turbulence. The Reynolds number (Re_λ) is varied from 180 to 300, and the study covers a range of size ratios (4 < Ξ < 16) for marginally light spheres. We find that the normalized acceleration PDF decreases in intermittency with increasing size ratio - in qualitative agreement with the predictions of the Faxén corrected model [1]. We also present preliminary results on the rotational dynamics of large light spheres in turbulence.

Original language	English
Publication status	Published - 1 Jan 2015
Event	15th European Turbulence Conference, ETC 2015 - Delft, Netherlands Duration: 25 Aug 2015 → 28 Aug 2015 Conference number: 15

Conference

Conference	15th European Turbulence Conference, ETC 2015
Abbreviated title	ETC 2015
Country/Territory	Netherlands
City	Delft
Period	25/08/15 → 28/08/15

Cite this

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title = "Dynamics of finite-sized light spheres in turbulence",

abstract = "We report experimental results on the Lagrangian dynamics of finite-size light particles in turbulence. Using an orthogonal camera setup and 3D particle tracking, we study the velocity and acceleration statistics of rigid light spheres in a water tunnel with nearly homogeneous and isotropic turbulence. The Reynolds number (Reλ) is varied from 180 to 300, and the study covers a range of size ratios (4 < Ξ < 16) for marginally light spheres. We find that the normalized acceleration PDF decreases in intermittency with increasing size ratio - in qualitative agreement with the predictions of the Fax{\'e}n corrected model [1]. We also present preliminary results on the rotational dynamics of large light spheres in turbulence.",

author = "Varghese Mathai and Vivek Prakash and Jon Brons and Chao Sun and Detlef Lohse",

year = "2015",

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T1 - Dynamics of finite-sized light spheres in turbulence

AU - Mathai, Varghese

AU - Prakash, Vivek

AU - Brons, Jon

AU - Sun, Chao

AU - Lohse, Detlef

N1 - Conference code: 15

PY - 2015/1/1

Y1 - 2015/1/1

N2 - We report experimental results on the Lagrangian dynamics of finite-size light particles in turbulence. Using an orthogonal camera setup and 3D particle tracking, we study the velocity and acceleration statistics of rigid light spheres in a water tunnel with nearly homogeneous and isotropic turbulence. The Reynolds number (Reλ) is varied from 180 to 300, and the study covers a range of size ratios (4 < Ξ < 16) for marginally light spheres. We find that the normalized acceleration PDF decreases in intermittency with increasing size ratio - in qualitative agreement with the predictions of the Faxén corrected model [1]. We also present preliminary results on the rotational dynamics of large light spheres in turbulence.

AB - We report experimental results on the Lagrangian dynamics of finite-size light particles in turbulence. Using an orthogonal camera setup and 3D particle tracking, we study the velocity and acceleration statistics of rigid light spheres in a water tunnel with nearly homogeneous and isotropic turbulence. The Reynolds number (Reλ) is varied from 180 to 300, and the study covers a range of size ratios (4 < Ξ < 16) for marginally light spheres. We find that the normalized acceleration PDF decreases in intermittency with increasing size ratio - in qualitative agreement with the predictions of the Faxén corrected model [1]. We also present preliminary results on the rotational dynamics of large light spheres in turbulence.

UR - http://www.scopus.com/inward/record.url?scp=85081080445&partnerID=8YFLogxK

M3 - Paper

T2 - 15th European Turbulence Conference, ETC 2015

Y2 - 25 August 2015 through 28 August 2015

ER -

Dynamics of finite-sized light spheres in turbulence

Abstract

Conference

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