Energy Harvesing Through Reverse Electrowetting
- 1. GUIDE HEAD
- 2. 1. What is energy harvesting ? 2. What is electrowetting ? 3. Surface energy 4. Contact angle 5. Reverse electrowetting 6. How it works ? 7. Arrangements of REWOD 8. How to make it efficient ? & challenges 9. Interesting application 10. References Contents
- 3. WHAT IS ENERGY HARVESTING ? Energy Harvesting is a simple phenomenon that deals with the conversion Of the freely available environmental energy into the electrical power Methods of Energy Harvesting: • Reverse Electrowetting • Piezoelectric • Electrostatic • Electromagnetic
- 4. WHAT IS ELECTROWETTING? • Electrowetting is a microfluidic phenomenon that changes the surface tension of the liquid on the solid surface on application of voltage. • ELECTROWETTING ON DIELECTRIC(EWOD) – Liquid spreading on the dielectric surface is facilitate by electrically induced increase in the dielectric surface wettability. Motion of a conductive liquid on a dielectric-coated conductive substrate. Wettability change arises from the extra electrostatic energy that is associated with electrically charged liquid-solid interface.
- 5. SURFACE ENERGY • Surface energy may be defined as the excess energy at the surface of the material compared to the bulk.
- 6. CONTACT ANGLE • The contact angle is the angle measured through the liquid, where a liquid/vapor interface meets a solid surface.
- 7. REVERSE ELECTROWETTING • Converting mechanical energy of liquid motion into electrical current, thus achieving reverse electrowetting (REWOD). • Constant bias voltage between droplet and electrode. • External mechanical actuation - moves the droplet to force the decrease of its overlap with the di-electric film coated electrode. • Converts pressure energy into electrical energy. • Liquid metal alloy- Galinstan. • Instep Nano power- research.
- 8. HOW IT WORKS? • Cmax----->Cmin because of change in effective contact area.
- 10. HOW TO MAKE IT EFFICIENT? • More energy is generated when the conductivity of the fluid is more. • Electrode material of low conductivity is preferable. • Using more droplets thereby increasing the effective contact area. • Making the channel length more. • Energy produced is very less. • Device manufacturing for practical purposes.
- 11. INTERESTING APPLICATION • When we walk our body produces 40 watts of mechanical power as heat when our feet strike the ground. • A special electricity-generating cushion placed inside the soles of a regular pair of shoes can transform some of that footfall power into several watts of electricity. • Over the course of a single day, the generated energy, which gets stored in a small battery in the sole, provides enough electricity for a pedestrian to extend her smartphone’s battery life.
- 12. CONCLUSION • As a fact only 11% of renewable energy contributes to our primary energy. If this project is deployed then not only we can overcome the energy crises problem but this also contributes to create a healthy global environmental change. • The researchers are working for large amount of power generation by using reverse electrowetting. Since the energy generated by this technic is not much to come in commercial power stations but we can view this method as secondary source of power for light load.
- 13. REFERENCES 1) Tom Krupenkin & J. Ashley Taylor, Reverse electrowetting as a new approach to high-power energy harvesting. Nature Communications, 2011, pp. 1-4. 2) Fusayo Saeki, Jean Baum, Hyejin Moon, Jeong-Yeol Yoon, Chang-Jin “CJ” Kim and Robin L. Garrell Electrowetting on Dielectrics (EWOD): Reducing Voltage Requirements for Microfluidics. University of California, Los Angeles, 2012. 3) Michael George Pollack Electrowetting-Based Microactuation of Droplets for Digital Microfluidics. Department of Electrical and Computer Engineering Duke University, 2001, pp. 7-14. 4) Gordon F. Christopher and Shelly L. Anna. Microfluidic methods for generating continuous droplet streams. Journal of Physics D: Applied Physics, 2007, pp. 319–336.
- 14. THANK YOU