Fundamental studies on droplet interactions in dense sprays
Abstract
Computational studies of interactive, vaporizing droplets have been made in order to understand better dynamics of dense sprays. Axisymmetric situations with droplets moving in tandem and three-dimensional situations with droplets moving in parallel have been considered. Detailed velocity and thermochemical properties fields have been determined. Lift and drag coefficients, Nusselt numbers, and Sherwood numbers for the droplets have been obtained. Correlations of these numbers with instantaneous Reynolds number and transfer number have been obtained. The flow field has been solved by implicit finite-difference solutions of the Navier-Stokes equations. Explanations for the modifications of lift and drag forces, trajectories, and transport phenomena due to droplet interactions have been formulated. Results have been obtained for fuel droplets, especially in high temperature environments, and, to a limited extent, for liquid oxygen (LOX) droplets in a hot, reducing environment. The results, especially the correlations, should prove useful in spray modeling.
- Publication:
-
Annual Technical Report
- Pub Date:
- December 1991
- Bibcode:
- 1991uci..rept.....S
- Keywords:
-
- Drops (Liquids);
- Finite Difference Theory;
- Flow Distribution;
- Navier-Stokes Equation;
- Sprayers;
- Thermochemical Properties;
- Vaporizing;
- Aerodynamic Coefficients;
- Aerodynamic Drag;
- Correlation;
- High Temperature Environments;
- Lift;
- Liquid Oxygen;
- Nusselt Number;
- Reynolds Number;
- Trajectories;
- Velocity Distribution;
- Fluid Mechanics and Heat Transfer