A study of the concentration field of a round jet by a quantitative visualization method
Abstract
A laser beam was employed, together with rotating mirrors, to scan a Re 11,000 jet exhaust that was seeded with incense. Light diffusion by the smoke particulates was recorded on ASA 1600 film. A link was established between the gray levels and the particle concentrations by digitizing the images on a Vidicon into a picture with 512 x 640 pixels, allowing for a 255 level gray scale. A particle counter provided reference measurements of the particle concentrations in the jet flow and automatic comparisons were made with the images generated with the Vidicon. Two successive images were processed in order to obtain an averaged image. The fluctuations in the concentration were found to be excessive relative to the temperature fluctuations in the exhaust due to the low thermal diffusivity of the particulates.
- Publication:
-
Academie des Sciences Paris Comptes Rendus Serie Sciences Mathematiques
- Pub Date:
- April 1983
- Bibcode:
- 1983CRASM.296.1011B
- Keywords:
-
- Flow Visualization;
- Jet Flow;
- Argon Lasers;
- Image Processing;
- Particle Density (Concentration);
- Particulates;
- Root-Mean-Square Errors;
- Fluid Mechanics and Heat Transfer