Experiments on the diffusion of smoke in isotropic turbulent flow
Abstract
Detailed properties of the downstream evolution of smoke released in an isotropic turbulent flow field are reported. Effects of turbulence on the mass transfer characteristics of the flow which in turn affect such things as the spread of pollution and the rate of chemical reactions are studied. Smoke is released a short distance downstream of a uniform grid placed perpendicular to a uniform stream of air in a wind tunnel. A laser Doppler velocimeter is used to make the desired velocity field measurements, and a laser light scattering technique provides the 'instantaneous' mass fraction, c, of smoke at the same point in the flow field. One point statistical properties of the velocity and concentration fields are obtained. The one point cross-correlations cu and cv are also reported.
- Publication:
-
11th Fluid and Plasma Dynamics Conference
- Pub Date:
- July 1978
- Bibcode:
- 1978fpdy.confQ....G
- Keywords:
-
- Atmospheric Diffusion;
- Flow Measurement;
- Isotropic Turbulence;
- Smoke;
- Turbulence Effects;
- Abundance;
- Air Pollution;
- Dispersing;
- Laser Doppler Velocimeters;
- Mass Transfer;
- Particulate Sampling;
- Standard Deviation;
- Velocity Measurement;
- Wind Tunnel Tests;
- Fluid Mechanics and Heat Transfer