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Bubbler: A Novel Ultra-High Power Density Energy Harvesting Method Based on Reverse Electrowetting.

Hsu TH, Manakasettharn S, Taylor JA, Krupenkin T - Sci Rep (2015)

Bottom Line: We have proposed and successfully demonstrated a novel approach to direct conversion of mechanical energy into electrical energy using microfluidics.Fast bubble dynamics, used in conjunction with REWOD, provides a possibility to increase the generated power density by over an order of magnitude, as compared to the REWOD alone.This energy conversion approach is particularly well suited for energy harvesting applications and can enable effective coupling to a broad array of mechanical systems including such ubiquitous but difficult to utilize low-frequency energy sources as human and machine motion.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, University of Wisconsin-Madison, 1513 UniversityAvenue, Mechanical Engineering Building Room 2238, Madison, WI, 53706, USA.

ABSTRACT
We have proposed and successfully demonstrated a novel approach to direct conversion of mechanical energy into electrical energy using microfluidics. The method combines previously demonstrated reverse electrowetting on dielectric (REWOD) phenomenon with the fast self-oscillating process of bubble growth and collapse. Fast bubble dynamics, used in conjunction with REWOD, provides a possibility to increase the generated power density by over an order of magnitude, as compared to the REWOD alone. This energy conversion approach is particularly well suited for energy harvesting applications and can enable effective coupling to a broad array of mechanical systems including such ubiquitous but difficult to utilize low-frequency energy sources as human and machine motion. The method can be scaled from a single micro cell with 10(-6) W output to power cell arrays with a total power output in excess of 10 W. This makes the fabrication of small light-weight energy harvesting devices capable of producing a wide range of power outputs feasible.

No MeSH data available.


Related in: MedlinePlus

Bubbler power generation predictions.(a) Projected energy per unit area obtained during one oscillation event as a function of the oscillation period τ and the applied bias voltage. (b) Projected average power per unit area as a function of the oscillation period τ and the applied bias voltage. The large red and blue dots represent the obtained experimental results.
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f8: Bubbler power generation predictions.(a) Projected energy per unit area obtained during one oscillation event as a function of the oscillation period τ and the applied bias voltage. (b) Projected average power per unit area as a function of the oscillation period τ and the applied bias voltage. The large red and blue dots represent the obtained experimental results.

Mentions: The developed CFD model of the bubble self-oscillation process taken in conjunction with equation (1) can be used to predict the performance of the bubbler method under various conditions. As was already discussed above the bubbler power density can be further increased by increasing the bias voltage or further increasing the oscillation frequency. The predicted power densities for the higher frequencies and higher bias voltages than those used in the experiment are shown in Fig. 8. The data show that at bias voltages above 50 V and oscillation frequencies above 2 kHz the projected average power density can exceed 10 kWm−2, which is an order of magnitude more than the maximum power density expected from the REWOD method alone2, i.e. without it being combined with the bubble self-oscillation process. The maximum power that can be experimentally obtained using the bubbler approach is likely to be below the theoretical predictions, with the dielectric film quality and its electrical breakdown stress likely to be the main limiting factors. This topic is the subject of the ongoing research and the results will be published elsewhere.


Bubbler: A Novel Ultra-High Power Density Energy Harvesting Method Based on Reverse Electrowetting.

Hsu TH, Manakasettharn S, Taylor JA, Krupenkin T - Sci Rep (2015)

Bubbler power generation predictions.(a) Projected energy per unit area obtained during one oscillation event as a function of the oscillation period τ and the applied bias voltage. (b) Projected average power per unit area as a function of the oscillation period τ and the applied bias voltage. The large red and blue dots represent the obtained experimental results.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4645099&req=5

f8: Bubbler power generation predictions.(a) Projected energy per unit area obtained during one oscillation event as a function of the oscillation period τ and the applied bias voltage. (b) Projected average power per unit area as a function of the oscillation period τ and the applied bias voltage. The large red and blue dots represent the obtained experimental results.
Mentions: The developed CFD model of the bubble self-oscillation process taken in conjunction with equation (1) can be used to predict the performance of the bubbler method under various conditions. As was already discussed above the bubbler power density can be further increased by increasing the bias voltage or further increasing the oscillation frequency. The predicted power densities for the higher frequencies and higher bias voltages than those used in the experiment are shown in Fig. 8. The data show that at bias voltages above 50 V and oscillation frequencies above 2 kHz the projected average power density can exceed 10 kWm−2, which is an order of magnitude more than the maximum power density expected from the REWOD method alone2, i.e. without it being combined with the bubble self-oscillation process. The maximum power that can be experimentally obtained using the bubbler approach is likely to be below the theoretical predictions, with the dielectric film quality and its electrical breakdown stress likely to be the main limiting factors. This topic is the subject of the ongoing research and the results will be published elsewhere.

Bottom Line: We have proposed and successfully demonstrated a novel approach to direct conversion of mechanical energy into electrical energy using microfluidics.Fast bubble dynamics, used in conjunction with REWOD, provides a possibility to increase the generated power density by over an order of magnitude, as compared to the REWOD alone.This energy conversion approach is particularly well suited for energy harvesting applications and can enable effective coupling to a broad array of mechanical systems including such ubiquitous but difficult to utilize low-frequency energy sources as human and machine motion.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, University of Wisconsin-Madison, 1513 UniversityAvenue, Mechanical Engineering Building Room 2238, Madison, WI, 53706, USA.

ABSTRACT
We have proposed and successfully demonstrated a novel approach to direct conversion of mechanical energy into electrical energy using microfluidics. The method combines previously demonstrated reverse electrowetting on dielectric (REWOD) phenomenon with the fast self-oscillating process of bubble growth and collapse. Fast bubble dynamics, used in conjunction with REWOD, provides a possibility to increase the generated power density by over an order of magnitude, as compared to the REWOD alone. This energy conversion approach is particularly well suited for energy harvesting applications and can enable effective coupling to a broad array of mechanical systems including such ubiquitous but difficult to utilize low-frequency energy sources as human and machine motion. The method can be scaled from a single micro cell with 10(-6) W output to power cell arrays with a total power output in excess of 10 W. This makes the fabrication of small light-weight energy harvesting devices capable of producing a wide range of power outputs feasible.

No MeSH data available.


Related in: MedlinePlus