1. Verification of Computational Methods of Modeling Evaporative Drops By Abraham Rosales Andrew Christian Jason Ju

2. Abstract This project presents theoretical, computational, and experimental aspects of mass-loss of fluid drops due to evaporation.

3. Overview Applications Experimental Setups and Procedures Experimental Results Derivation of Methodology Numerical Results Discussion of Disparities

4. Evaporation Process

5. Applications Manufacturing computer chips –Influence conductivity of electrons Lubrication or cleaning of machinery –Duration of the fluid Printing process –Spreading and drying time.

6. Experimental Setup

7. software

8. Video of 100% IPA Evaporation

9. Experimental Results for 100% Isopropyl Alcohol

10. Video of Water Evaporation

11. Experimental Results for Water

12. Experimentally Determined Evaporation Constant

13. Conceptual and Theoretical Derivations

14. Reduce Navier stokes equation (lubrication approximation) Re << 1, ignore inertia term Incompressible fluid. For detail derivations see (instabilities in Gravity driven flow of thin fluid films by professor Kondic)

15. Conceptual and Theoretical Derivations

16. Derivations: Van Der Waal Forces

17. Van Der Waal Approximation: Lennard Jones Potential  In our use:

18. Derivations: Evaporation

19. Numerical Scheme: Forward Time, Central Space

20. Numerical Scheme: All Together + CoOrdinate Foolishness

21. Results: 100% Alcohol

23. Disparities:

24. Results: 100% Alcohol

25. Disparities:

27. Water Issues:

28. Mixology Issues:

29. Conclusion Mass loss fits for fluids which behave within lubrication approximation. Surface tension term keeps area similar regardless of intermolecular forces. Things not within approximation: Combinations of liquids High contact angles

30. Questions and Answers