Drop formation by DOD ink-jet nozzles: A comparison of experiment and numerical simulation

Shield, T. W.; Bogy, David B.; Talke, Frank E.

doi:10.1147/rd.311.0096

Cited by 100 publications

(55 citation statements)

References 5 publications

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“…9) In earlier studies, the time evolution of the liquid shape, which includes ejected liquid from nozzle to form liquid column, necking of liquid column, variations of liquid column, and formation as well as combination of main droplet and satellites, has been observed during the formation and ejection of the droplet. 7,10) At early stage of ejection, the contracted transducer expands; liquid in the nozzle is accelerated and pushed out of the nozzle orifice. The meniscus quickly extends outward until a liquid column with a round leading edge is formed.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pulse Voltage on the Droplet Formation of Alcohol and Ethylene Glycol in a Piezoelectric Inkjet Printing Process with Bipolar Pulse

Tsai

Hwang

2008

Mater. Trans.

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The dynamics of droplet formation of liquid in a piezoelectric inkjet printing process with bipolar pulse and drop-on-demand (DOD) mode is investigated in this study. Two liquids with different viscosities and surface tension coefficients; alcohol and ethylene glycol, are studied. The effects of pulse voltage on the droplet formation are also examined. A piezoelectric actuated inkjet printhead with a nozzle orifice of 30 mm in diameter is employed to conduct the investigations at room temperature (25 C). The complex morphologies of the droplets during their formation, which include ejection and stretching of liquid, contraction of liquid column, pinch-off of liquid column from nozzle exit, breakup of liquid column into primary droplet and possible satellites, and combination of primary drop and satellites, are demonstrated. The droplet size is in the range of 23-37 mm. The investigations also show a workable pulse voltage range; between 28 and 40 volts, exists for the droplets to be smoothly generated and ejected for alcohol where viscosity and surface tension coefficient are smaller. The range is between 30 and 50 volts for ethylene glycol. Within this workable voltage range, one single droplet for each pulse can be achieved with lower voltage. For the intermediate voltage, two droplets are generated initially and collide into one during the flying stage. For the higher voltage, multiple droplets are formed without recombination. It is also found that the velocities of the main droplet and satellite droplet in the different voltage ranges are responsible for whether the multiple initial droplets can be recombined.

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Section: Introductionmentioning

confidence: 99%

Effects of Pulse Voltage on the Droplet Formation of Alcohol and Ethylene Glycol in a Piezoelectric Inkjet Printing Process with Bipolar Pulse

Tsai

Hwang

2008

Mater. Trans.

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“…The optimum pulse width was equal to ration of cavity length and speed on sound in liquid. Shield 7) used both experimentation and two-dimensional numerical simulation to study the ejection behavior of droplets of DI water and ethylene glycol. The simulation results were compared with the experimental results.…”

Section: )mentioning

confidence: 99%

The Effects of Operating Parameters on Micro-Droplet Formation in a Piezoelectric Inkjet Printhead Using a Double Pulse Voltage Pattern

Lin

Shan

et al. 2006

Mater. Trans.

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The formation and ejection behavior of droplets created by a squeeze mode piezoelectric inkjet printing device using a double pulse voltage pattern are investigated in this study. Two types of fluid, de-ionized (DI) water and ethylene glycol, are used. The effects of operating frequency, positive voltage keeping time and pulse voltage magnitude on the volume and velocity of the droplets are discussed. The experimental results are consistent with the propagation theory of acoustic waves. The maximum allowable pulse frequencies in DI water and ethylene glycol are 2,000 and 22,700 Hz respectively. If the positive voltage keeping time equals the time required for the acoustic waves to propagate through the printhead, optimal ejection behavior is achieved. As the pulse voltage increases, both the velocity and volume of each droplet become larger.

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“…The generation of inkjet droplets is a complex process, and the precise physics and fluid mechanics of the process are still the subject of much research [10] . To understand the jetting behavior of the liquids with pressure waveform, numerical analysis has also been employed [11][12][13][14][15][16] . For most of applications, it is very important that only a single drop is generated.…”

Section: Introductionmentioning

confidence: 99%

The Simulation Study of Fluid Physical Properties on Drop Formation of Drop-on-demand Inkjet Printing

Zhang

Zhu

Cheng

et al. 2015

MATEC Web of Conferences

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Inkjet printing is a method for directly patterning and fabricating patterns without the need for masks. However, the physical phenomenon in inkjet printing process is very complicated with the coupling of piezoelectricity, elasticity, and free surface fluid dynamics. The authors use the volume of fluid (VOF) method as implemented in the commercial code FLUENT to model the details of the drop formation process. The influence of viscosity and surface tension of the liquid on the droplet formation process is investigated. Consequently, we find that the speed of liquid plays an important role for the jet stability. The viscosity of liquid greatly influences the final speed of droplet. However, the surface tension of liquid does not much affect the speed of droplet. It changes the shape of the liquid thread and final droplet.

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Drop formation by DOD ink-jet nozzles: A comparison of experiment and numerical simulation

Cited by 100 publications

References 5 publications

Effects of Pulse Voltage on the Droplet Formation of Alcohol and Ethylene Glycol in a Piezoelectric Inkjet Printing Process with Bipolar Pulse

Effects of Pulse Voltage on the Droplet Formation of Alcohol and Ethylene Glycol in a Piezoelectric Inkjet Printing Process with Bipolar Pulse

The Effects of Operating Parameters on Micro-Droplet Formation in a Piezoelectric Inkjet Printhead Using a Double Pulse Voltage Pattern

The Simulation Study of Fluid Physical Properties on Drop Formation of Drop-on-demand Inkjet Printing

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