this ppt gives you an information about Energy Harvesing Through Reverse Electrowetting which related to electrical engineering field

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.

9. ARRANGEMENTS OF REWOD

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