Unmixing demonstration with a twist: A photochromic Taylor-Couette device

Research output: Contribution to journalArticle

Abstract

This article describes an updated version of the famous Taylor-Couette flow reversibility demonstration. The viscous fluid confined between two concentric cylinders is forced to move by the rotating inner cylinder and visualized through the transparent outer cylinder. After a few rotations, a colored blob of fluid appears well mixed. Yet, after reversing the motion for the same number of turns, the blob reappears in the original location as if the fluid has just been unmixed. The use of household supplies makes the device inexpensive and easy to build without specific technical skills. The device can be used for demonstrations in fluid dynamics courses and outreach activities to discuss the concepts of viscosity, creeping flows, the absence of inertia, and time-reversibility.

Original languageEnglish (US)
Pages (from-to)796-800
Number of pages5
JournalAmerican Journal of Physics
Volume85
Issue number10
DOIs
StatePublished - Oct 1 2017

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concentric cylinders
reversing
Couette flow
fluids
viscous fluids
fluid dynamics
inertia
viscosity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Unmixing demonstration with a twist : A photochromic Taylor-Couette device. / Fonda, Enrico; Sreenivasan, Katepalli R.

In: American Journal of Physics, Vol. 85, No. 10, 01.10.2017, p. 796-800.

Research output: Contribution to journalArticle

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