Hydrodynamic response model of a piezoelectric inkjet print-head

Wang, Jianjun; Huang, Jin; Peng, Ju

doi:10.1016/j.sna.2018.11.001

Cited by 16 publications

(12 citation statements)

References 18 publications

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“…The ratio of the change in radial direction to the radius is so small that the flow inside the tube could be assumed to be an undeveloped flow. It is in a tiny boundary layer that the viscous stress affects the liquid in the channel, and there is rarely viscous stress in the main flow [ 22 ]. Therefore, when the inkjet printhead is operating, the viscous stress inside can be approximated as the shearing stress on the wall of the inkjet tube, and

can be omitted.…”

Section: Problem Simplificationmentioning

confidence: 99%

Modelling of Power-Law Fluid Flow Inside a Piezoelectric Inkjet Printhead

Peng

Huang

Wang

2021

Sensors

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Piezoelectric three-dimensional inkjet printing has been used to manufacture heterogeneous objects due to its high level of flexibility. The materials used are non-Newtonian inks with complex rheological properties, and their behavior in the context of inkjet printing has not been fully understood: for example, the fact that the shear-thinning viscosity affects the droplet generation. Therefore, a control strategy coping with shear-thinning behaviors is needed to ensure printing consistency. In this paper, a novel model-based approach is presented to describe the shear-thinning ink dynamics inside the piezoelectric inkjet printhead, which provides the basis to design the excitation parameters in a systematic way. The dynamic equation is simplified into a quasi-one-dimensional equation through the combination of the boundary layer theory and the constitutive equation of the power-law fluid, of which the viscosity is shear-thinning. Based on this, a nonlinear time-varying equivalent circuit model is presented to simulate the power-law fluid flow rate inside the tube. The feasibility and effectiveness of this model can be evaluated by comparing the results of computational fluid dynamics and the experimental results.

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can be omitted.…”

Section: Problem Simplificationmentioning

confidence: 99%

Modelling of Power-Law Fluid Flow Inside a Piezoelectric Inkjet Printhead

Peng

Huang

Wang

2021

Sensors

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“…For this purpose, the pressure or velocity history of the meniscus or pressure chamber is needed. Numerical calculations and simulations [ 17 , 18 ], narrow channel theory [ 19 , 20 ], model-based [ 10 , 21 , 22 , 23 ], and experimental [ 13 , 14 ] approaches have been used to acquire the pressure and velocity histories at the pressure chamber and nozzle. Among these methods, the experimental or model-based approach can be used to determine the optimal parameters of the bipolar voltage waveform.…”

Section: Introductionmentioning

confidence: 99%

“…The authors of [ 10 , 23 ] used a model-based approach to obtain the optimal voltage waveform with respect to suppressing residual vibrations. However, detailed analysis of the suppression of residual vibrations is still missing in these previously published research articles.…”

Section: Introductionmentioning

confidence: 99%

Actuating Voltage Waveform Optimization of Piezoelectric Inkjet Printhead for Suppression of Residual Vibrations

Shah

Lee

et al. 2020

Micromachines

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After a piezoelectric inkjet printhead jets the first droplet, the actuating membrane still vibrates, creating residual vibrations in the ink channel, which can degrade the inkjet printhead performance. For suppressing these vibrations, an optimized actuating voltage waveform with two pulses must be obtained, of which the first pulse is used for jetting and the second pulse is used to suppress the residual vibrations. In this study, the pressure history within the ink channel of a recirculating piezoelectric inkjet printhead was first acquired using lumped element modeling. Then, for suppressing residual vibrations, a bipolar voltage waveform was optimized via analysis of the tuning time (tt ), dwell time (td2), rising time (tr2), falling time (tf2), and voltage amplitude of the second pulse. Two voltage waveforms, Waveform 01 and Waveform 02, were optimized thereafter. In Waveform 01, tt=2 μs, td2=2 μs, and tr2 and tf2=1 μs were finalized as the optimal parameters; in the case of another waveform, the optimal parameters of td2, tr2, and tf2 were found to be 4, 1, and 1 μs, respectively. The optimal voltage amplitude of the second pulse was found to be 1/3 the amplitude of the first pulse. On the basis of our analysis, the tuning time in Waveform 01 is the most sensitive parameter, and the performance yielded is even poorer than that yielded by standard waveform, if not optimized. Therefore, the other waveform is recommended for the suppression of residual vibrations.

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“…The pressure and the velocity profiles were acquired through analysis of numerical and lumped models. Wang et al [8] performed LEM for the squeeze mode PIP. The device is actuated by squeezing the piezoelectric membrane.…”

Section: Introductionmentioning

confidence: 99%

“…The LEM analyzed designs presented in references [6][7][8], as well as some other designs with improved dots-per-inch (DPI) and waveforms [9,10], and in miscellaneous studies [11][12][13], are non-recirculating. The problem with non-recirculating PIPs is that heat can be produced during the operation and damage the nearby structure, and thereby degrade the overall performance.…”

Section: Introductionmentioning

confidence: 99%

Design and Characteristic Analysis of a MEMS Piezo-Driven Recirculating Inkjet Printhead Using Lumped Element Modeling

2019

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The recirculation of ink in an inkjet printhead system keeps the ink temperature and viscosity constant, and leads to the development of a high-performance device. Herein, we propose a recirculating piezo-driven micro-electro-mechanical system (MEMS)-based inkjet printhead that has a pressure chamber, a nozzle, and double restrictors. The design and characteristic analysis are performed using a two-port lumped element model (LEM) to investigate the effect of design parameters on the system responses. Using LEM, the jetting pressure at the pressure chamber, velocity at the nozzle inlet, meniscus pressure, and Helmholtz resonance frequency are predicted and the comparative analysis of the jetting pressure and velocity between LEM and the finite element method (FEM) simulation is conducted to validate our proposed LEM method. Furthermore, the effect of a change in major design parameters on the jetting pressure, velocity, and Helmholtz resonance frequency is analyzed. On the basis of this analysis, the optimized device dimensions are finalized. From our analysis, it is also concluded that the restrictor is more sensitive than the pressure chamber in terms of their variations in depth. As the cross-talk effect can occur due to an array of hundreds or thousands of nozzles, we investigated the effect of a single activated nozzle on the non-activated neighboring nozzles, as well as the effect of multi-activated nozzles on a single central nozzle using our proposed LEM.

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Hydrodynamic response model of a piezoelectric inkjet print-head

Cited by 16 publications

References 18 publications

Modelling of Power-Law Fluid Flow Inside a Piezoelectric Inkjet Printhead

Modelling of Power-Law Fluid Flow Inside a Piezoelectric Inkjet Printhead

Actuating Voltage Waveform Optimization of Piezoelectric Inkjet Printhead for Suppression of Residual Vibrations

Design and Characteristic Analysis of a MEMS Piezo-Driven Recirculating Inkjet Printhead Using Lumped Element Modeling

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