A study on the fluctuation concentration field in a turbulent jet: On the measurement of the concentration fluctuation intensity and the self-preservation
Abstract
The diffusion process in a circular jet of a dye solution issuing into a quiescent water was investigated experimentally. Also a semi-empirical theory for the radial profile of the concentration fluctuation intensity is presented. Measurements of the concentration field for a dye solution were performed by a light absorption method because of the simplicity of its measuring principle and movability of the probe. Experimental results showed that the radial profiles of the mean axial velocity and mean concentration had well-known Gaussian distributions. A self-preserving form for the profiles of the concentration fluctuation intensity was observed in the downstream region x/d sub N or = 100. Using these results and assumptions of the gradient type diffusion process, an analysis and calculations are presented on the self-preserving profile of the concentration fluctuation intensity.
- Publication:
-
Nagoya University Faculty Engineering Memoirs
- Pub Date:
- May 1982
- Bibcode:
- 1982NUFEM..34R.113N
- Keywords:
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- Concentration (Composition);
- Fluid Jets;
- Turbulent Diffusion;
- Turbulent Jets;
- Variations;
- Differential Equations;
- Flow Velocity;
- Optical Measurement;
- Velocity Distribution;
- Fluid Mechanics and Heat Transfer