Effects of turbulence and number density on the drag coefficient of droplets
Abstract
Droplet drag coefficients for polydispersed drops are determined via the behavior of drops decelerating on the stagnation streamline of a cylinder with an afterbody mounted in a wind tunnel test section. A variety of velocity, turbulence levels, and droplet number densities were studied. A force balance equation technique was used to determine drag coefficient. For the levels of number density, up to 700/cc, and turbulence, up to about 7 percent, no definite effects were seen. However, the smallest drops in the high turbulence case showed some evidence of drop-turbulence and/or drop-drop interactions. The drag results that were developed for this set of measurements agreed well with other empirical relations previously determined.
- Publication:
-
29th AIAA Aerospace Sciences Meeting
- Pub Date:
- January 1991
- Bibcode:
- 1991aiaa.meetU....R
- Keywords:
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- Cylindrical Bodies;
- Drag Coefficients;
- Drops (Liquids);
- Turbulence Effects;
- Wind Tunnel Tests;
- Drop Size;
- Flow Distribution;
- Flow Visualization;
- Nozzles;
- Size Distribution;
- Fluid Mechanics and Heat Transfer