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Study on droplet formation with surface tension for electrohydrodynamic inkjet nozzle

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Abstract

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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Authors and Affiliations

  1. Graduate School of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 440-746, Korea

    Soo-Hong Lee & Xuan Hung Nguyen

  2. School of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 440-746, Korea

    Han Seo Ko

Authors
  1. Soo-Hong Lee
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  2. Xuan Hung Nguyen
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  3. Han Seo Ko
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Correspondence to Han Seo Ko.

Additional information

Han Seo Ko is an Associate Professor in the School of Mechanical Engineering, Sungkyunkwan University, Korea. He received his Ph.D in Mechanical Engineering in 1998 from Texas A&M University. His research interests are microfluidics, optical tomography and micro-droplet ejection.

Soo-Hong Lee is a graduate student (Ph.D) in the School of Mechanical Engineering, Sungkyunkwan University, Korea. His research interests are electrohydro-dynamics for inkjet, flow visualization technique, micro/nano fludics and computational fluid dynamics.

Xuan Hung Nguyen is a graduate student (Ph.D) in the School of Mechanical Engineering, Sungkyunkwan University, Korea. He received his master’s degree in Mechanical Engineering in 2009 from Sungkyunkwan University. His research interests are optical tomography, microdroplet ejection and loop heat pipe.

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Lee, SH., Nguyen, X.H. & Ko, H.S. Study on droplet formation with surface tension for electrohydrodynamic inkjet nozzle. J Mech Sci Technol 26, 1403–1408 (2012). https://doi.org/10.1007/s12206-012-0301-y

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  • DOI: https://doi.org/10.1007/s12206-012-0301-y

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