AVERAGE TEMPERATURES AND TEMPERATURE FLUCTUATIONS BEHIND A HEATED WIRE
Abstract
The turbulent diffusion process in air was studied by measuring temperatures as a function of position in the wake of an electrically heated wire stretched across a round pipe. The Reynolds number based on the three-inch diameter of the pipe was ten thousand. Traverses were made behind a 0.0126-inch diameter wire at distances ranging from 0.10 inch to 18 inches. The time average temperature profiles and the mean-square fluctuating temperature profiles were measured by single resistance thermometers; and mean fluctuating temperature products by two resistance thermometers separated by from 0.026 to 0.608 inches. The data were compared to Taylor's single-particle diffusion theory; to Batchelor's particle-pair and particle-cloud diffusion theory; to Townsend's analysis of diffusion from a line source in homogeneous turbulence; and to smooth and rough wandering plume models. A structural function (after Obukhov) was also calculated. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1961
- Accession Number
- AD0255954
Entities
People
- Glen F. Crum
- Thomas J. Hanratty
Organizations
- University of Illinois Urbana–Champaign