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ENERGY HARVESTING THROUGH REVERSE ELECTROWETTING

ENERGY HARVESTING THROUGH REVERSE ELECTROWETTING. -VINUTHNA C.R DEBOLINA SAHA. Electrowetting.

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ENERGY HARVESTING THROUGH REVERSE ELECTROWETTING

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  1. ENERGY HARVESTING THROUGH REVERSEELECTROWETTING -VINUTHNA C.R DEBOLINA SAHA

  2. 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 facilitated 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.

  3. Surface Energy • Wiki definition: Surface energy may be defined as the excess energy at the surface of the material compared to the bulk. • ρ(sl effective)=ρ(sl0) – 1/2CV^2 • cosϴ=cosϴ0 +1/2CV^2

  4. Contact angle • The contact angle is the angle measured through the liquid, where a liquid/vapour interface meets a solid surface.

  5. 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 • Tom Krupenkin and Ashley Taylor • Converts pressure energy into electrical energy • Liquid metal alloy- Galinstan • Instep Nano power- research • Basic concept - Change in contact angle and surface energy

  6. How this works ? • Capacitance(C) = €0A/d • Cmax----->Cminbecause of change in effective contact area.

  7. 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 Challenges…. • Energy produced is very less • Device manufacturing for practical purposes

  8. “Footfalls for phone calls” • 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

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