1. Effect of Nano-Fiber Mat on Droplet Formation Julie Kraus Research Advisor – Professor Alexander Yarin Main Graduate Student Advisor – Suman Ray

2. Why is this important? Dropwise condensation has applications in cooling electrical systems Retarding dropwise condensation could prevent corrosion of metals

3. Kelvin Equation Capillary Tube Symbols Bernoulli Equation If we assume that the liquid is incompressible

4. Kelvin Equation Symbols Capillary Tube

5. Kelvin Equation Symbols Capillary Tube Ideal Gas Law

6. Kelvin Equation Symbols Capillary Tube

7. Summery Capillary Tube

8. Implications Rough Surface (nano-fiber mat) Smooth Surface

9. Electrospinning ProsCons Very consistent fiber thickness High quality nano-fiber Does not work for every polymer Slower than most other nano-fiber fabrication methods - - - - - - - - - + + + + Liquid Polymer Taylor Cone Charged Plate

10. Copper Nano-fiber Mat

11. Basic Procedure

13. Data

14. Data Processing

18. Results

20. Further Work 1.Testing different types of fibermats 2.Refining of the Matlab code 3.Testing at different temperatures

21. Questions? I would like to acknowledge the financial support from the National Science Foundation, EEC-NSF Grant # 1062943