Probability density of velocity increments in weakly turbulent pipe flow
Istituto Nazionale Fisica della Materia, INFM,
Dipartimento di Ingegneria e Fisica dell'Ambiente, Università della Basilicata - Italy
Accepted: 28 April 1998
New Laser Doppler Velocimetry measurements are presented of the probability density function of velocity increments for pipe flow at very low Reynolds number. It will be shown that stretched exponentials provide a good model to the tails of the density function. This result parallels that already known for fully developed turbulence and gains further experimental evidence to the concept of extended self-similarity for very low Reynolds number.
PACS: 05.40.+j – Fluctuation phenomena, random processes, and Brownian motion / 47.27.-i – Turbulent flows, convection, and heat transfer
© EDP Sciences, 1998