Europhys. Lett.
Volume 76, Number 4, November 2006
Page(s) 595 - 601
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 20 October 2006
Europhys. Lett., 76 (4), pp. 595-601 (2006)
DOI: 10.1209/epl/i2006-10333-0

Measurement of entropy production rate in compressible turbulence

M. M. Bandi1, W. I. Goldburg1 and J. R. Cressman jr2

1  Department of Physics & Astronomy, University of Pittsburgh Pittsburgh, PA 15260, USA
2  Krasnow Institute, George Mason University - Fairfax, VA 22030, USA

received 26 June 2006; accepted in final form 29 September 2006
published online 20 October 2006

The rate of change of entropy $\dot S$ is measured for a system of particles floating on the surface of a fluid maintained in a turbulent steady state. The resulting coagulation of the floaters allows one to relate $\dot S$ to the the velocity divergence and to the Lyapunov exponents characterizing the behavior of this system. The quantities measured from experiments and simulations are found to agree well with the theoretical predictions.

47.27.-i - Turbulent flows.
47.27.ed - Dynamical systems approaches.
47.52.+j - Chaos in fluid dynamics.

© EDP Sciences 2006