On accumulation of water droplets in piezoelectric energy harvesting

Wong, Voon‐Kean; Ho, Jee-Hou; Sam, Hui-Ken

doi:10.1177/1045389x16649702

Cited by 15 publications

(27 citation statements)

References 18 publications

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“…In each application, we discuss the excitation sources, analyze state-of-the-art harvesters, and identify existing problems and future directions. In addition to the aforementioned main applications, energy harvesters have also been explored in rain, [163][164][165][166] pavement, 167 gunfire munitions, 168 cutting tools, 169 and wildlife, 170,171 which are not covered here.…”

Section: Applicationsmentioning

confidence: 99%

High-Performance Piezoelectric Energy Harvesters and Their Applications

Yang

Zhou

et al. 2018

Joule

913

415

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Energy harvesting holds great potential to achieve long-lifespan self-powered operations of wireless sensor networks, wearable devices, and medical implants, and thus has attracted substantial interest from both academia and industry. This paper presents a comprehensive review of piezoelectric energyharvesting techniques developed in the last decade. The piezoelectric effect has been widely adopted to convert mechanical energy to electricity, due to its high energy conversion efficiency, ease of implementation, and miniaturization. From the viewpoint of applications, we are most concerned about whether an energy harvester can generate sufficient power under a variable excitation. Therefore, here we concentrate on methodologies leading to high power output and broad operational bandwidth. Different designs, nonlinear methods, optimization techniques, and harvesting materials are reviewed and discussed in depth. Furthermore, we identify four promising applications: shoes, pacemakers, tire pressure monitoring systems, and bridge and building monitoring. We review new high-performance energy harvesters proposed for each application.

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Section: Applicationsmentioning

confidence: 99%

High-Performance Piezoelectric Energy Harvesters and Their Applications

Yang

Zhou

et al. 2018

Joule

913

415

View full text Add to dashboard Cite

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“…The water layer increases until it reaches the edges of the harvester and there is a spill. This unsteady behavior has some important effects on harvester dynamics [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…The impact of a raindrop on the on the dry harvester surface leads to abrupt spreading and splashing with a waste of usable energy. Conversely, the presence of a water layer changes the impact dynamics, since the water layer accumulated on the harvester makes the impact surface softer [16]. The mass of water that accumulates on the surface of the harvester adds to the mass of the harvester itself and lowers the natural frequency of the system [14].…”

Section: Introductionmentioning

confidence: 99%

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Development of a Novel Piezoelectric Harvester Excited by Raindrops

Doria

Fanti

Filipi

et al. 2019

Sensors

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The impact of raindrops on a dry surface leads to a splashing phenomenon that dissipates a lot of energy. To improve energy collection, a novel piezoelectric raindrop energy harvester equipped with a spoonful of water was developed. The advantages and the drawbacks of this solution were analyzed with the aid of numerical simulations. A series of experimental tests were carried out in a laboratory with simulated raindrops. Experimental results showed that the negative effect of the added water mass was exceeded by the positive effects related to the impact of the raindrop on a liquid surface. Tests carried out connecting the harvester to a resistive load showed that the prototype was able to collect more energy than a simple cantilever harvester.

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“…The current mechanical-to-electrical energy conversion efficiency is on order of 0.1% which still needs further improvement [ 4 ]. Hence, efforts have been made in developing novel harvesting structures [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ], improving the performance of different piezoelectric materials [ 12 , 13 , 14 ] and the dynamic outputs from a piezoelectric beam subjected to droplet impact [ 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of PVDF Cantilever Due to Droplet Impact Using an Electromechanical Model

Hao

Dong

et al. 2020

Sensors

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The dynamic response of a polyvinylidene fluoride (PVDF) cantilever beam under excitation of water droplet impact is investigated by developing an electromechanical model. In the model, the governing equations of beam motion and output voltage are derived in the theoretical way, such that the voltage across the PVDF layer and the cantilever deflection can be predicted. The motion of the beam is described by the multi-mode vibration model through which more accurate results can be obtained. The predicted results of the model are validated by the experiment. Combined with the experiment and the model, the effect of surface wettability on droplet-substrate interaction mechanisms is investigated, which provides an insight into the improvement of mechanical-to-electrical energy conversion efficiency in raindrop energy harvesting (REH) applications. Results show: (1) the droplet splash on a super-hydrophobic beam surface has a positive effect on voltage generation. The splash limit that affects the reaction force of the impacting droplet is experimentally determined and greatly dominant by the Weber number. (2) Small-scaled droplets in splash regime allow generating higher voltage output from a super-hydrophobic beam surface than from an untreated hydrophilic beam surface. (3) Tests of successive droplet impacts also show that a super-hydrophobic surface performs better over a hydrophilic surface by producing constant peak voltage and higher electrical energy harvested. In this case, the voltage measured from the hydrophilic surface decreases gradually as the water layer is accumulated. Overall, the electromechanical behaviors of a super-hydrophobic PVDF cantilever sensor can be well predicted by the model which shows a great potential in energy harvesting by maximizing the inelastic collision upon droplet-substrate interactions.

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On accumulation of water droplets in piezoelectric energy harvesting

Cited by 15 publications

References 18 publications

High-Performance Piezoelectric Energy Harvesters and Their Applications

High-Performance Piezoelectric Energy Harvesters and Their Applications

Development of a Novel Piezoelectric Harvester Excited by Raindrops

Dynamic Response of PVDF Cantilever Due to Droplet Impact Using an Electromechanical Model

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