Added-Mass Effect in Modeling of Cilia-Based Devices for Microfluidic Systems

Kongthon, Jiradech; McKay, B.; Iamratanakul, D.; Oh, Kieseok; Chung, Jae Hyun; Riley, James J.; Devasia, Santosh

doi:10.1115/nemb2010-13366

Cited by 3 publications

(2 citation statements)

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“…As water droplet impinges onto the piezoelectric beam, water starts to accumulate on the surface of the beam and forms a water layer. This added mass can be treated as both resistive force and artificial mass on the beam structure (Kongthon et al, 2010). Besides the apparent structure mass, the water layer also changes the dynamic properties of the system such as modal mass and modal damping.…”

Section: Piezoelectric Beam Model With Water Layermentioning

confidence: 99%

On accumulation of water droplets in piezoelectric energy harvesting

Wong

Sam

2016

Journal of Intelligent Material Systems and Structures

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Recent studies have demonstrated that it is feasible to harvest energy from raindrop. A challenge in designing a raindrop energy harvester is the rain droplet would accumulate on the surface of the harvester and affect its performance. In a previous work, we have modelled the dynamics of a piezoelectric beam subjected to water droplet impacts with a water layer formed on the surface. This work presents a theoretical model to describe the transient dynamics during the formation of water layer on the beam. The average water droplet impact force is described by a partially inelastic impact coefficient that varies during the formation of water layer. The maximum root mean square voltage measured experimentally is 0.05 V with an average percentage error of 6.94% compared to the theoretical model. Experimental result revealed that the optimal performance of the harvester occurs before the water layer spreads to the width end of the beam.

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Section: Piezoelectric Beam Model With Water Layermentioning

confidence: 99%

On accumulation of water droplets in piezoelectric energy harvesting

Wong

Sam

2016

Journal of Intelligent Material Systems and Structures

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“…When water droplets start to accumulate on the piezoelectric beam, a shallow water layer will be formed. The water layer acts as a resistive force and could be treated as added mass effect (Kongthon et al, 2010). Additional parameter matrices due to the water layer are introduced into the mechanical domain of the equation of motion.…”

Section: Piezoelectric Beam Model With Water Layermentioning

confidence: 99%

Dynamics of a piezoelectric beam subjected to water droplet impact with water layer formed on the surface

Wong

Yap

2014

Journal of Intelligent Material Systems and Structures

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Rain impact energy harvesting using piezoelectric energy harvester has gained much attention recently. However, previous works have only considered the effect of single water droplet. In the case of raindrop, water would accumulate on the surface of the energy harvester and form a shallow water layer. This article models the dynamics of a piezoelectric beam, served as a raindrop energy harvester, subjected to water droplet impact with water layer formed on the surface. The impact of water droplet on the tip of the energy harvester is modelled as an impulsive force, and the water layer on the surface of the energy harvester is modelled as an added mass to the energy harvester. An attempt to model the force generated by the water ripple as a distributed load on the piezoelectric beam is presented. Numerical studies have been conducted based upon the proposed mathematical model verified by experimental results. The results showed that the presence of the water layer affects the output voltage and the dominant frequency of the energy harvester. It reveals that the effect of water (or rain) accumulation on the piezoelectric surface should be considered in deriving an optimal operating condition of such energy harvester.

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Effect of Excitation Waveforms on Biomimetic Cilia-Based Micromixing

Kongthon¹

2014

AMM

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This article presents the effect of excitation waveforms on the rate of micromixing evaluated using biomimetic cilia-based microfluidic devices (soft cantilever-type, vibrating devices that are excited by the oscillations of the piezoactuator with different trajectories). The main contribution of this article is to experimentally evaluate the mixing excited by different waveforms and to report that (i) the mixing time is significantly decreased through employing the cilia when compared to the case without employing the cilia; (ii) the mixing time in case of employing the cilia is additionally decreased through the application of the symmetric triangular waveform with sharper turnarounds when compared to the case of the symmetric sinusoidal waveform (with smoother turnarounds); (iii) furthermore, the mixing time in case of employing the cilia is reduced further through applying asymmetric excitation waveforms with greater asymmetry when compared to the case of applying asymmetric excitation waveforms with less asymmetry.

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Added-Mass Effect in Modeling of Cilia-Based Devices for Microfluidic Systems

Cited by 3 publications

References 0 publications

On accumulation of water droplets in piezoelectric energy harvesting

On accumulation of water droplets in piezoelectric energy harvesting

Dynamics of a piezoelectric beam subjected to water droplet impact with water layer formed on the surface

Effect of Excitation Waveforms on Biomimetic Cilia-Based Micromixing

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