Accession Number:

AD0255954

Title:

AVERAGE TEMPERATURES AND TEMPERATURE FLUCTUATIONS BEHIND A HEATED WIRE

Descriptive Note:

Corporate Author:

ILLINOIS UNIV URBANA

Personal Author(s):

Report Date:

1961-03-01

Pagination or Media Count:

1.0

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 Taylors single-particle diffusion theory to Batchelors particle-pair and particle-cloud diffusion theory to Townsends 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

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE