Eulerian and Lagrangian predictions of turbulent evaporating sprays
Abstract
The two widely-used approaches based on the Lagrangian and Eulerian treatments for spray dynamics are compared with the recent laser Doppler anemometer spray measurements of Solomon et al. (1984). In the Lagrangian approach, the effect of carrier phase turbulence on droplet dispersion is considered by using a Monte Carlo sampling technique. In the Eulerian approach, the droplet dispersion is considered by using the droplet Schmidt number, which is modeled after the recent work of Mostafa and Elghobashi (to be published). Both approaches use a two-phase turbulence model recently proposed by Mostafa and Mongia (1986). The resulting governing equations are solved numerically using a finite difference technique. The agreement between the predictions using both approaches are in reasonably good agreement with the data. The Eulerian approach yields more consistent results than the Lagrangian approach. The Monte Carlo technique is more expensive than the multisized Eulerian approach. This technique should be further investigated to obtain a balance between its high cost and potential improvements.
- Publication:
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24th AIAA Aerospace Sciences Meeting
- Pub Date:
- January 1986
- Bibcode:
- 1986aiaa.meetQU...M
- Keywords:
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- Euler-Lagrange Equation;
- Spray Characteristics;
- Turbulent Flow;
- Computational Fluid Dynamics;
- Euler Equations Of Motion;
- Finite Difference Theory;
- Friction Factor;
- Laser Doppler Velocimeters;
- Monte Carlo Method;
- Turbulence Models;
- Fluid Mechanics and Heat Transfer