The Forced Oscillations of an Oblate Drop Sandwiched Between Different Inhomogeneous Surfaces under AC Vibrational Force

Kashina, M. A.; Alabuzhev, A. A.

doi:10.1007/s12217-021-09886-4

Cited by 4 publications

(2 citation statements)

References 46 publications

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“…When the driving voltage is applied, different periodical features are found for the droplet dancing at the resonance frequencies and departure from resonance. Though an alternating current voltage would indeed slightly reduce the hysteresis effect, the electrowetting effect can be enhanced by lowering the actuation frequency [ 35 , 36 , 37 ]. As one of the important indicators of EWDs, the aperture ratio could be directly used to evaluate the effect of the display, as shown in Equation (6) [ 38 ] where

is the aperture ratio and the different aperture ratios show different gray scales.…”

Section: Principle Of Ewdsmentioning

confidence: 99%

Design of Multi-DC Overdriving Waveform of Electrowetting Displays for Gray Scale Consistency

Wang

Zhang

et al. 2023

Micromachines

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Gray scale consistency in pixels was extremely important for electrowetting displays (EWDs). However, traditional electrowetting display driving waveforms could not obtain a pixel aperture ratio consistency, which led to the occurrence of gray inconsistency even if it was the same driving waveform. In addition, the oil backflow caused by charge trapping could not be sustained. Therefore, a multi-direct current (DC) overdriving waveform for gray scale consistency was proposed in this paper, which could effectively improve the performance of EWDs. The driving waveform was divided into a start-up driving phase and a stable driving phase. The stable driving phase was composed of a square wave with a duty cycle of 79% and a frequency of 43 Hz. Subsequently, an overdriving pulse was also introduced in the stable driving phase. The multi-DC driving waveform for gray scale consistency was applied to a thin film transistor-electrowetting display (TFT-EWD). The average difference between increasing driving voltage and decreasing driving voltage was only 2.79%. The proposed driving waveform has an aperture ratio of 3.7 times at low voltages compared to DC driving.

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is the aperture ratio and the different aperture ratios show different gray scales.…”

Section: Principle Of Ewdsmentioning

confidence: 99%

Design of Multi-DC Overdriving Waveform of Electrowetting Displays for Gray Scale Consistency

Wang

Zhang

et al. 2023

Micromachines

View full text Add to dashboard Cite

show abstract

“…The impact of electric charges on the behavior of single sessile drops is investigated experimentally by Löwe et al [15]. In the work of [16], it is demonstrated that the effect of the electric field can be described by an effective condition at the contact line. The specific geometry of a drop's base also affects its oscillations.…”

Section: Introductionmentioning

confidence: 99%

The Shape of a Compressible Drop on a Vibrating Solid Plate

Ivantsov,

Lyubimova,

Khilko

et al. 2023

Mathematics

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The influence of high-frequency vibrations on the shape of a compressible drop placed on an oscillating solid substrate is studied in this paper. Due to the significant difference in characteristic temporal scales, the average and pulsating motions of the drop can be considered separately. For nearly hemispherical drop, the solution to the problem of pulsating motion is found in the form of series in Legendre polynomials. Frequencies of natural sound oscillations of hemispherical axisymmetric drop are obtained. Resonances of the acoustic mode of drop oscillations are found. The problem of forced oscillations of hemispherical drop in the limit of weakly compressible liquid is considered. It is found that drop oscillation amplitude grows with vibration intensity according to quadratic law, which is consistent with the solution of the pulsation problem for finite compressibility assumption. A variational principle for calculation of average drop shape is formulated based on minimization of energy functional for the case, so the compressibility of the liquid should be taken into account. It is shown that the functional (the sum of the kinetic and potential energies of the pulsating flow, the kinetic energy of the averaged flow, and the surface tension energy of the drop) decreases and reaches a minimum value at quasi-equilibrium state, in which the average shape of the drop becomes static. The influence of vibrations on the drop shape is studied for small values of the vibrational parameter. The surface of the drop in the absence of vibrations is assumed to be hemispherical. Calculations showed that under vibrations, drop height decreases, while the area of the base increases.

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The Influence of Plate Surface Inhomogeneity on the Oscillations of the Confined Gas Bubble

Alabuzhev

2024

Interfac Phenom Heat Transfer

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Free and forced oscillations of a squeezed gas bubble are investigated. The bubble is placed in a finite volume of an incompressible fluid with a free outer interface. Two parallel solid plates with inhomogeneous surfaces confine the liquid and the bubble. An external oscillating pressure field acts on the system. The method is proposed for taking into account the effect of surface inhomogeneity. The dependence of the frequency of natural oscillations and the damping decrement on the wetting parameter are plotted. It is shown that the inhomogeneity significantly changes the frequency values. Well-marked resonant effects are demonstrated. The inhomogeneity leads to the excitation of azimuthal modes, while the external action excites only volumetric oscillations.

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The Forced Oscillations of an Oblate Drop Sandwiched Between Different Inhomogeneous Surfaces under AC Vibrational Force

Cited by 4 publications

References 46 publications

Design of Multi-DC Overdriving Waveform of Electrowetting Displays for Gray Scale Consistency

Design of Multi-DC Overdriving Waveform of Electrowetting Displays for Gray Scale Consistency

The Shape of a Compressible Drop on a Vibrating Solid Plate

The Influence of Plate Surface Inhomogeneity on the Oscillations of the Confined Gas Bubble

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