Drop size and concentration in a spray by sideward laser light scattering measurements
Abstract
Modal drop size in nonabsorbing liquid sprays is evaluated by means of a novel technique based on sideward scattering, which relies on the additive contributions in the 90-110 deg scattering angle range of the external reflection as well as those of peripherally travelling surface waves which are respectively more polarized on the vertical than the horizontal plane. The technique has been applied to the dense early region of a pressure-atomized hollow cone light oil spray, in order to obtain values of the modal size, number concentration, and volume fraction of drop clouds with very high spatial resolution. It is shown that in either a quiescent environment or in a coaxially oriented fluid-dynamic air pattern, a large number of small droplets which are not easily detected by other sizing techniques are entrained toward the central part of the spray, just downstream of the droplet formation region. The technique has accordingly been applied to the study of the interaction between swirled flow and sprays in three different fluid-dynamic configurations.
- Publication:
-
Combustion Science and Technology
- Pub Date:
- 1984
- Bibcode:
- 1984CST....36...19B
- Keywords:
-
- Drop Size;
- Flow Visualization;
- Fuel Sprays;
- Laser Applications;
- Laser Beams;
- Light Scattering;
- Spray Characteristics;
- Concentration (Composition);
- Diameters;
- Mie Scattering;
- Oils;
- Polarized Light;
- Fluid Mechanics and Heat Transfer