Relevant bibliographies by topics / Inkjet nozzle

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Inkjet nozzle'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Inkjet nozzle"

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Wu, Sen Yang, Yong He, Jian Zhong Fu, and Hui Feng Shao. "Design and Fabrication of a Piezoelectric Bend Mode Drop-on-Demand Inkjet Printhead with Interchangeable Nozzle." Advanced Materials Research 819 (September 2013): 311–16. http://dx.doi.org/10.4028/www.scientific.net/amr.819.311.

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The drop-on-demand (DOD) inkjet printing technology has been widely used in many fields and several types of droplet generators are developed. This paper presents the design, fabrication and tests of a piezoelectric bend mode drop-on-demand inkjet printhead with interchangeable nozzle. A disk-type PZT is actuated to push the liquid out of inkjet printhead by a function generator, and a droplet is formed because of surface tension. The interchangeable nozzle design enables the same printhead to be fitted with nozzles of different orifice size, thus a clogged nozzle can be easily removed for cleaning or replacement. An experimental platform for micro-droplet jetting is built in this paper. The droplet formation is recorded by a CCD camera as pictures, which can be used to measure the droplet dimension. The experiments are carried out by using the self-developed bend mode piezoelectric inkjet printing system. The influence of the drive parameters on the droplet quality is also studied by dispensing water.
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Shen, Sheng Chih, Chung Jui Lee, Min Wen Wang, Yi Cheng Chen, Yu Jen Wang, and Yung Yue Chen. "Fabrication Micro-Nozzle Plates for Inkjet Print Head Using LIGA Process." Materials Science Forum 594 (August 2008): 132–37. http://dx.doi.org/10.4028/www.scientific.net/msf.594.132.

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This paper presents a novel LIGA-like process to fabricate the nozzle plate for matching the requirements of the 600 dpi inkjet printhead. This novel fabrication technique reduces the production cost from 100% current process to 50%. This mass production technique comprises two main technologies: Ni-Co electroforming and plastic injection molding. The nozzle plate consists ink channels, ink cavities, and nozzles for enhancing the integrity and excusing the assembly process. The dimensions of nozzle plate are 4.16mm in width and 7.3mm in length, respectively. Total thickness of micro-nozzle plates are thickness≦100um(ink channels and ink cavities), and the diameter and pitch of the nozzle holes are 40±3um and 168±3 um, respectively. Straightly speaking, for being the main compositions of the 600 dpi inkjet printhead design, the above fabrication process is qualified enough and capable of yielding satisfactory results.
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Shah, Lee, and Hur. "Design and Characteristic Analysis of a MEMS Piezo-Driven Recirculating Inkjet Printhead Using Lumped Element Modeling." Micromachines 10, no. 11 (November 6, 2019): 757. http://dx.doi.org/10.3390/mi10110757.

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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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de Jong, Jos, Hans Reinten, Herman Wijshoff, Marc van den Berg, Koos Delescen, Rini van Dongen, Frieder Mugele, Michel Versluis, and Detlef Lohse. "Marangoni flow on an inkjet nozzle plate." Applied Physics Letters 91, no. 20 (November 12, 2007): 204102. http://dx.doi.org/10.1063/1.2812473.

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OKANO, Mamoru, Tomohiro INOUE, Yoshiharu TAKIZAWA, Tadayuki MATSUDA, and Akira MIYAO. "A New Nozzle for Continuous Inkjet Printers." Journal of Advanced Mechanical Design, Systems, and Manufacturing 4, no. 4 (2010): 764–72. http://dx.doi.org/10.1299/jamdsm.4.764.

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Hu, Sige, Daulet Kenzhebalin, Bakedu Choi, George Chiu, Zillion Lin, Davi He, and Jan Allebach. "Developing an inkjet printer III: Multibit CMY halftones to hardware-ready bits." Electronic Imaging 2020, no. 15 (January 26, 2020): 352–1. http://dx.doi.org/10.2352/issn.2470-1173.2020.15.color-351.

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Nowadays, inkjet printers are widely used all around the world. But how do they transfer the digital image to a map that can control nozzle firing? In this paper, we briefly illustrate that part of the printing pipeline that starts from a halftone image and end with Hardware Ready Bits (HRBs). We also describe the implementation of the multi-pass printing method with a designed print mask. HRBs are used to read an input halftone CMY image and output a binary map of each color to decide whether or not to eject the corresponding color drop at each pixel position. In general, for an inkjet printer, each row of the image corresponds to one specific nozzle in each swath so that each swath will be the height of the printhead [1]. To avoid visible white streaks due to clogged or burned out color nozzles, the method called multi-pass printing is implemented. Subsequently, the print mask is introduced so that we can decide during which pass each pixel should be printed.
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Mizunuma, Takehito, Yoko Yamanishi, Shinya Sakuma, Hisataka Maruyama, and Fumihito Arai. "Disposable Inkjet Mechanism for Microdroplet Dispensing." Journal of Robotics and Mechatronics 22, no. 3 (June 20, 2010): 341–47. http://dx.doi.org/10.20965/jrm.2010.p0341.

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We succeeded in dispensing microdroplets using a disposable inkjet. The novelty of our device lies in the following points: (1) We used a glass-plate-bonded polydimethylsiloxane (PDMS) membrane to fabricate a leaf spring whose spring coefficient is 14 times higher than that of conventional PDMS membranes. This enabled droplets to be dispensed continuously up to 10 Hz when the membrane vibrated through the use of a multilayer piezoelectric actuator attached to the disposable PDMS chip. (2) The nozzle for droplet dispensing was fabricated from thick photoresist (SU-8) to obtain a hydrophobic surface preventing the production of undesired satellite droplets, yielding a droplet dispensing accuracy of ±16.2 µm. Droplets produced by the disposable nozzle, which was 100 µm in diameter, ranged from 95-105 µm at an applied voltage of 105 V.
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Wang, Yuehui, Xiaoli Wu, Ke Wang, Kaiwen Lin, Hui Xie, Xiaobing Zhang, and Jingze Li. "Novel Insights into Inkjet Printed Silver Nanowires Flexible Transparent Conductive Films." International Journal of Molecular Sciences 22, no. 14 (July 19, 2021): 7719. http://dx.doi.org/10.3390/ijms22147719.

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Silver nanowire (AgNWs) inks for inkjet printing were prepared and the effects of the solvent system, wetting agent, AgNWs suspension on the viscosity, surface tension, contact angle between ink droplet and poly(ethylene) terephthalate (PET) surface, and pH value of AgNWs ink were discussed. Further, AgNWs flexible transparent conductive films were fabricated by using inkjet printing process on the PET substrate, and the effects of the number printing layer, heat treatment temperature, drop frequency, and number of nozzle on the microstructures and photoelectric properties of AgNWs films were investigated in detail. The experimental results demonstrated that the 14-layer AgNWs printed film heated at 60 °C and 70 °C had an average sheet resistance of 13 Ω∙sq−1 and 23 Ω∙sq−1 and average transparency of 81.9% and 83.1%, respectively, and displayed good photoelectric performance when the inkjet printing parameters were set to the voltage of 20 V, number of nozzles of 16, drop frequency of 7000 Hz, droplet spacing of 15 μm, PET substrate temperatures of 40 °C and nozzles of 35 °C during printing, and heat treatment at 60 °C for 20 min. The accumulation and overflow of AgNWs at the edges of the linear pattern were observed, which resulted in a decrease in printing accuracy. We successfully printed the heart-shaped pattern and then demonstrated that it could work well. This showed that the well-defined pattern with good photoelectric properties can be obtained by using an inkjet printing process with silver nanowires ink as inkjet material.
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Yang, Jianmin, Daisuke Katagiri, Sifeng Mao, Hulie Zeng, Hizuru Nakajima, and Katsumi Uchiyama. "Generation of controlled monodisperse porous polymer particles by dipped inkjet injection." RSC Advances 5, no. 10 (2015): 7297–303. http://dx.doi.org/10.1039/c4ra13275k.

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Zhong, Yonghong, Haisheng Fang, Qianli Ma, and Xuran Dong. "Analysis of droplet stability after ejection from an inkjet nozzle." Journal of Fluid Mechanics 845 (April 26, 2018): 378–91. http://dx.doi.org/10.1017/jfm.2018.251.

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Inkjet technology is a commendable tool in many applications including graphics printing, bioengineering and micro-electromechanical systems (MEMS). Droplet stability is a key factor influencing inkjet performance. The stability can be analysed using dimensionless numbers that usually combine thermophysical properties and system dimensions. In this paper, a drop-on-demand (DOD) inkjet experimental system is established. A numerical model is developed to investigate the influence of the operating conditions on droplet stability, including nozzle dimensions, driving parameters (the pulse amplitude and width used to drive droplet formation) and fluid properties. The results indicate that the stability can be improved by decreasing the pulse amplitude and width, decreasing the fluid density and viscosity or increasing the nozzle diameter and fluid surface tension. Based on case analysis and modelling, a dimensionless number ($Z$), the reciprocal of the Ohnesorge number, is numerically determined for a stable droplet to lie in a range between 4 and 8. To explicitly combine the driving parameters, a new stability criterion, $Pj$, is further proposed. A general rule taking into account both $Pj$ and $Z$ is proposed for choosing appropriate driving parameters to eject stable droplets for a known nozzle and fluid, which is further validated by experiments.
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Dissertations / Theses on the topic "Inkjet nozzle"

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Patel, Kamleshkumar Chhanabhai. "Production of uniform particles via single stream drying and new applications of the reaction engineering approach." Monash University. Faculty of Engineering. Chemical Engineering, 2008. http://arrow.monash.edu.au/hdl/1959.1/59514.

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In this thesis investigations are carried out on two research topics in context to spray drying. The first research topic is the production of dried particles having uniform characteristics. The second research topic is the development of new applications of the reaction engineering approach which, in recent times, has emerged as an effective tool to formulate drying kinetics models. The reaction engineering approach is also implemented to simulate the drying of monodisperse droplets corresponding to the experimental work in the first research topic. Manufacturing micron- and nano-sized particles having uniform characteristics has recently become a popular research area due to the unique functionalities of these kinds of particles in biomedical, drug delivery, functional foods, nutraceuticals, cosmetics and other valuable applications. Spray drying has been a common and economical route to produce dried particles. A typical characteristic of spray dried products is the existence of a significant variation in particle properties such as size and morphology. One possible idea to restrict this product non-uniformity is to achieve a good control over the droplet’s behaviour and characteristics inside the drying chamber. The current thesis has investigated an innovative spray drying technique, i.e. a single stream drying approach in order to restrict product non-uniformity. In this drying approach, identical sized droplets having vertical trajectories are dried under controlled gas flow conditions. The piezoelectricity-driven monodisperse droplet generator is used as the atomizer to disperse liquid droplets. A prototype single stream dryer was assembled based on the single stream drying approach using various components designed in the laboratory and several parts purchased from the market. Experiments were carried out using aqueous lactose solutions as a model system in order to check the practicability of manufacturing uniform-sized spherical particles. Preliminary results were found to be positive and reported in this thesis. Mathematical models on the drying of monodisperse droplets were developed in order to predict important droplet and gas parameter profiles during single stream drying. These models serve as a platform for design, optimization and scale-up purposes. Several important advantages and drawbacks of single stream drying are also reported. Problems encountered during the experimental work and future recommendations are presented in detail so that a more robust and effective drying research tool can be developed in future. Recently the reaction engineering approach (REA) has emerged as a simple and reliable technique to characterize the drying of various food and dairy materials. In this thesis two new applications of the REA are described for the first time in context to convective drying of aqueous droplets. The REA is used in this study to formulate the drying kinetics model for the drying of aqueous sucrose and maltodextrin (DE6) droplets. The effect of initial moisture content was explicitly demonstrated. The development of a new ‘composite’ REA which aimed to model the drying of aqueous droplets containing multiple solutes has been described. The composite REA was found to be suitable to characterize the drying behaviour of aqueous sucrose-maltodextrin mixtures of different proportions. The second new application of the REA is the development of a procedure to estimate surface properties of aqueous droplets during drying. In literature various droplet characteristics such as surface moisture contents were normally estimated using the diffusion-based drying kinetics model or the receding interface model. Surface moisture content and surface glass transition temperature profiles were evaluated here using a lumped-parameter model (REA) during the drying of aqueous sucrose, maltodextrin (DE6) and their mixtures. The same experimental data used for the development of the composite REA were used to yield predictions. The procedure was found to be useful in estimating surface moisture contents and understanding the stickiness behaviour of sugar droplets during drying. During the formulation of the REA-based drying kinetics model in this thesis, the assumption of uniform temperature within droplets was used. In most studies published in literature the uniform temperature assumption was justified by calculating the heat-transfer Biot numbers at the beginning and end of drying. However, the conventional Biot number concept does not take into account the evaporation effect and therefore would not be suitable to drying scenarios. In this thesis, a new approximation procedure is developed to estimate surface-centre temperature differences within materials following the entire drying process. This new procedure was helpful to check the extent of temperature non-uniformity within skim milk droplets under isothermal laboratory conditions as well as industrial spray drying conditions. Both conventional and drying-based Biot numbers are calculated and compared. Predictions showed that temperature gradients within the droplets were negligible during the drying of suspended droplets under laboratory drying conditions (slow drying), whilst the gradients were small and existed only for a short drying period for small droplets under industrial spray drying conditions (fast drying). Furthermore, it was observed that the maximum temperature gradient within the droplets did not exist at the starting or end points of the drying process, and therefore the estimation of Biot numbers at the starting and end point does not reflect temperature non-uniformity under drying conditions. This is a significant theoretical development in the area.
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Yan, Jiu-Yan, and 顏久焱. "An Investigation of precise mold application in inkjet print nozzle plates." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/58295092723412911202.

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碩士
國立雲林科技大學
機械工程系碩士班
93
In this study objective of micro drill machines development, to make use of this technique to manufacture reverse Micro-EDM need middle electrode, middle electrode in mode electricity discharge machine to set up high speed spindle to use machine drill to replace EDM drill process, to proceed diameter 100μm and diameter 40μm hole manufacture, to accomplish 300dpi and 600dpi of middle electrode manufacture. In precise mold forming .to use micro-EDM process manufacture 300dpi micro shaft mold reverse forming.
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Hsu, Yu-Jui, and 許育瑞. "The Implementation of the Multi-Nozzle Inkjet Printing System and Multi-Gas Sensing Device." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/76442545183226836686.

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碩士
國立臺灣大學
工程科學及海洋工程學研究所
104
Recently, developments of organic electronics has attracted attention in both academic and industrial researches. Because of flexibilities of organic electronics, different applications, such as monitors, E-Paper, organic solar cells, and RFID tags, etc., have been designed and implemented. And market potentials have been valued as one of the next generation technologies. Based on these technological advancements, different kinds of fabrication methods have been developed. In these fabrication methods, inkjet-printing technologies are intriguing because of large-area and low-cost processes. As a consequence, this thesis aims to demonstrate potentials of inkjet-printing and printable sensing technologies for organic-electronic applications. To address the development of printing technologies, in this thesis, both multi-nozzle printing system and multi-printable gas sensor are presented. In multi-nozzle printing development, a control firmware of multi-nozzle piezoelectric head is designed and implemented. In multi-printable gas sensor, on the other hand, two kinds of printable sensing materials are implemented and tested with different kinds of gases. Based on these achievements, the potential of printable organic sensing module can be demonstrated.
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Tseng, Tzu-Wei, and 曾子威. "Study on Waveform Design for Multi-Nozzle Piezo Inkjet Head in Material-Jetting Additive Manufacturing." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/zr3gt7.

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碩士
國立臺灣科技大學
機械工程系
105
Recently, using a variety of materials is the development trend of the material jetting technology. But the same piezoelectric drive waveform will not be applicable for different property of photopolymer resin. As the waveform directly affects the droplet performance which determines the quality and accuracy of printing object. Therefore, this study developed a waveform design method by adjusting waveform parameters to rapidly apply various materials to the printing process. For gray level printing, the triple-pulse parameters such as voltage, hold time and separating time were defined and analyzed their effect on droplet velocity. An observation system with a high-speed camera could actually observe the material ejection after the parameters adjustment. The jetting drop without satellite is the target for the optimal waveform. Exploring the size and thickness of droplets when printed on one layer to feedback the process parameters such as layer height and printhead shift. As result, the droplet velocity is affected by fill time and hold time. Under the fixed pulse width, it jets droplet with maximum velocity. As the number of pulses increased, the droplet volume almost linearly grows, and its spreading diameter raise on based material. In the end, this design method will be applied to the other material to verify its feasibility. The design waveform base on single-pulse extending to triple-pulse, that can eject three different sizes of droplets. Through the waveform design, only a few parameters tuned, can provide the user setting the printing process to achieve the requirements of the accuracy.
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Book chapters on the topic "Inkjet nozzle"

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"NOZZLE-FREE INKJET TECHNOLOGY." In Nanoparticle Technology Handbook, 546–50. Elsevier, 2008. http://dx.doi.org/10.1016/b978-044453122-3.50040-4.

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Fukui, Takehisa. "Nozzle-free inkjet technology." In Nanoparticle Technology Handbook, 546–50. Elsevier, 2012. http://dx.doi.org/10.1016/b978-0-444-56336-1.50043-6.

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Fukui, Takehisa. "Nozzle-Free Inkjet Technology." In Nanoparticle Technology Handbook, 691–94. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-444-64110-6.00061-5.

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"Waveguide Theory of Single-nozzle Print Head." In Design of Piezo Inkjet Print Heads, 193–261. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527806874.ch5.

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Uchida, Seiichi, Marcus Liwicki, Masakazu Iwamura, Shinichiro Omachi, and Koichi Kise. "Data-Embedding Pen." In Advances in Multimedia and Interactive Technologies, 396–411. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2217-3.ch018.

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In this chapter, the authors present a new writing device called data-embedding pen, where a single inkjet nozzle is attached to its pen tip. When writing a stroke, the nozzle produces an additional ink-dot sequence along the stroke. The ink-dot sequence can represent various meta-information, such as the writer’s ID, the writing date, and a certain URL. Since the embedded meta-information is placed on the paper, it can be extracted by scanning or photographing the paper. Accordingly, by the data-embedding pen, a physical paper conveys any digital information. In other words, handwriting by the data-embedding pen can be a new medium connecting the physical and cyber worlds.
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Conference papers on the topic "Inkjet nozzle"

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Chen, J., W. Juan, J. Kubby, and B.-C. Hseih. "A Monolithic Polymide Nozzle Array for Inkjet Printing." In 1998 Solid-State, Actuators, and Microsystems Workshop. San Diego, CA USA: Transducer Research Foundation, Inc., 1998. http://dx.doi.org/10.31438/trf.hh1998.71.

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Chen, J., W. Juan, J. Kubby, and B.-C. Hseih. "A Monolithic Polymide Nozzle Array for Inkjet Printing." In 1998 Solid-State, Actuators, and Microsystems Workshop. San Diego, CA USA: Transducer Research Foundation, Inc., 1998. http://dx.doi.org/10.31438/trf.hh1998.71.

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Wei, Jia, Pasqualina M. Sarro, and Trinh Chu Duc. "A piezoresistive sensor for pressure monitoring at inkjet nozzle." In 2010 Ninth IEEE Sensors Conference (SENSORS 2010). IEEE, 2010. http://dx.doi.org/10.1109/icsens.2010.5690353.

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Liu, Xinbing. "Ultrafast Laser Production of color Inkjet Printer Nozzle Plates." In Laser and Tera-Hertz Science and Technology. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/ltst.2012.mf4a.2.

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Lee, K. I., B. Lim, H. Lee, S. H. Kim, C. S. Lee, J. W. Cho, S. Chung, and Y. Hong. "Multi nozzle electrohydrodynamic inkjet printing head by batch fabrication." In 2013 IEEE 26th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2013. http://dx.doi.org/10.1109/memsys.2013.6474458.

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Lee, Soo-Hong, Nguyen Xuan Hung, and Han Seo Ko. "Study on Droplet Formation With Surface Tension for Electrohydrodynamic Inkjet Nozzle." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-09025.

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Droplet ejection from an Electrohydrodynamic (EHD) inkjet nozzle depends on many factors such as an onset voltage, liquid conductivity, surface tension, etc. Since the surface tension has an influence on the contact angle between the nozzle surface and the liquid droplet, the surface tension change should be investigated for the control of the droplet ejection. In this study, surfactant which can weaken the surface tension force was used to analyze the effect of the surface tension. Furthermore, hydrophobic coating of the nozzle surface was considered as another factor for the droplet ejection. Also, a flow visualization technique was developed to observe the droplet formation and ejection from the EHD inkjet nozzle by various surface tension values.
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Li, Guangyong, Xuan Wu, and Dong-weon Lee. "A novel liquid metal-based inkjet nozzle for flexible electronics." In TRANSDUCERS 2015 - 2015 18th International Solid-State Sensors, Actuators and Microsystems Conference. IEEE, 2015. http://dx.doi.org/10.1109/transducers.2015.7180930.

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Kang, Seung-Hwan, Jong Woo Lim, San Kim, Dong Kee Sohn, and Han Seo Ko. "Study on Terminal Velocity of Continuously Ejected Micro Inkjet Droplet." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5055.

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Abstract It is important to make the droplet formation in the printable area for a design of an inkjet device. One of the important variables for the inkjet is an ejecting velocity which can be controlled by the inkjet device. When the drop-on-demand inkjet nozzle is used, unless the ejecting velocity exceeds the minimum velocity, the droplet may not be ejected or the nozzle surface can be wet, thus the next droplet formation may fail. On the other hand, if the droplet velocity is too fast, splashing may happen when the drop impacts on a substrate, which makes the undesirable printing error. The falling velocity of the inkjet droplet changes by the drag force of air along the falling distance. Therefore, it is required to estimate the exact ejecting, falling and terminal velocity of the inkjet droplet. We measured the inkjet droplet velocity ejecting from the nozzle of a piezoelectric drop-on-demand inkjet device with a push mode. The nozzle diameter was 70 μm and polyethylene glycol aqueous solution was used as ink. The inkjet droplets were generated within a range of 500 to 10,000 Hz of frequencies at a reference piezoelectric input voltage. The successive inkjet droplets were captured by the high-speed camera with 100,000 fps, then the inkjet droplet velocities were analyzed visually at each falling location. The initial to terminal velocity changes of the droplets were calculated theoretically to be compared with the experimental results according to the diameter of the droplet, the drag coefficient, and the Reynolds number. The general terminal velocity of the droplet is determined by the density and diameter of the droplet. However, this study confirmed that the terminal velocity of the continuously ejected droplets by the drop-on-demand inkjet was determined by the interval of the droplets which depended on the frequency. The inkjet droplet in the low frequency has the long interval that is enough to consider as an independent droplet so that it can follow the terminal velocity curve of the general droplet. However, with increasing the frequency, the inkjet droplets are generated frequently and its interval gets shorter, and then its terminal velocity is relatively high not following the general terminal velocity curve. It is considered that each droplet gets into the wake field of the former droplet so that its drag force can decrease and the velocity can increase. We analyzed the velocity change of the inkjet droplet according to its diameter and frequency based on the experimental and numerical results.
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Kim, Min Soo, Dong Kee Sohn, Seung Joo Shin, Keon Kuk, and Yong Soo Oh. "Improvement of Firing Frequency Limits by Investigation of Ejection Failure Modes in Thermal Inkjet Print Heads." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56118.

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Ejection failure modes determining the firing frequency limit in thermal inkjet heads were investigated from performance experiments and numerical simulations. Dominant failure modes were affected by the flow resistance ratio in the ink flow passages. Optimal flow resistance ratios were obtained experimentally to provide maximum frequency limits for both mono and color inkjet heads. Numerical simulations were performed on the meniscus oscillation, the ejection behavior in consecutive firing, and the cross-talk induced flow. Numerical results supported the importance of flow resistance ratio in maximizing firing frequency limit in both unit nozzle and multi-nozzle firing. Our investigation will help to develop the inkjet print heads of more reliable high-speed performance.
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Delrot, Paul, Miguel A. Modestino, Demetri Psaltis, and Christophe Moser. "Laser-assisted inkjet printing of highly viscous fluids with sub-nozzle resolution." In SPIE LASE, edited by Bo Gu, Henry Helvajian, and Alberto Piqué. SPIE, 2016. http://dx.doi.org/10.1117/12.2210833.

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