Library Subscription: Guest
Eighth International Symposium on Turbulence and Shear Flow Phenomena
August, 28-30, 2013, Poitiers, Futuroscope, France

DOI: 10.1615/TSFP8

REYNOLDS-NUMBER SCALING OF TURBULENT CHANNEL FLOW

pages 1-6
DOI: 10.1615/TSFP8.660
Get accessGet access

ABSTRACT

Results of an experimental study of smooth-wall, fully-developed, turbulent channel flow are presented. The Reynolds number (Rem) based on the channel height and the bulk mean velocity ranged from 10,000 − 300,000. The present results indicate that the skin-friction coefficient (Cf) closely follows a power law for Rem < 62,000. At higher Reynolds numbers, Cf is best described by a log law. Detailed two-component velocity measurements taken at friction Reynolds numbers of Reτ = 1,000 − 6,000 indicate that the mean flow and Reynolds shear stress display little or no Reynolds-number dependence. The streamwise Reynolds normal stress (u'2+), on the other hand, varies significantly with Reynolds number. The inner peak in u'2+, is observed to grow with Reynolds number. Growth in u'2+farther from the wall is documented over the entire range of Reynolds number giving rise to a plateau in the streamwise Reynolds normal stress in the overlap region of the profile for Reτ = 6,000. The wall-normal Reynolds normal stress (u'2+) displays no Reynolds-number dependence near the wall. Some increase in u'2+in the outer layer is noted for Reτ ≤ 4,000.

Begell Digital Portal Begell Digital Library eBooks Journals References & Proceedings Research Collections Prices and Subscription Policies Begell House Contact Us Language English 中文 Русский Português German French Spain