1. Model Validation Drop Collisions: Exp. vs. Sim.
Experimental
(in Air)
We=23, X=0.05 m
Numerical
(in Vacuum)
We=39, X=0
700 m

2. Definitions Only Equal Size Drops, D Spherical Uniform Velocity
Head-On (X=0)
Different Fluid Properties:
Water, Mercury & Tetradecane
Different Sizes for Water
Off-Axis (X>0)
Only Water
Different Sizes
Head-On
Off-Axis b

3. Head-on Collisions Coalescence (Water, We=40, Re=936)2 3 4 5 6 1 16 17 15 11 12 8 9 10 7 13 14 18 19 20 21 22 24 23 25 30 35 40

4. Head-on Collisions Separation (Water, We=58, Re=1127)1 2 3 4 5 11 12 13 8 9 10 6 7 14 15 16 17 18 19 20 21 22 24 23

5. Head-on Collisions Separation (Water, We=58, Re=1127)1 2 3 4 5 11 12 13 8 9 10 6 7 14 15 16 17 18 19 20 21 22 24 23

6. Head-on Collisions Internal Flow Patterns (We=58, Re=1127)6 4 3 2 7 9 10 11 8

7. Head-on Collisions Pressure and Velocities: Just before Breakup

8. End-Pinching Details
70% Z
60% Z
50% Z

9. Head-on Collisions Pressure and Velocities: Maximum Kinetic Energy