한국생산제조학회 학술지 영문 홈페이지

Current Issue

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 33 , No. 3

[ Article ]
Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 32, No. 4, pp. 206-214
Abbreviation: J. Korean Soc. Manuf. Technol. Eng.
ISSN: 2508-5107 (Online)
Print publication date 15 Aug 2023
Received 30 Jun 2023 Revised 27 Jul 2023 Accepted 28 Jul 2023
DOI: https://doi.org/10.7735/ksmte.2023.32.4.206

Droplet Mass and Length in a Piezoelectric Needle-valve Jetting Dispenser for a Power-law Fluid
Da-Hoon Parka ; Kwang Kima, *
aDepartment of Mechanical Design Engineering, Tech University of Korea

Correspondence to : *Tel.: +82-31-8041-0428 E-mail address: kimkwang@tukorea.ac.kr (Kwang Kim).

Funding Information ▼

Abstract

Jetting mass and droplet morphology variations in a high-viscosity power-law fluid dispensing system were investigated. A specialized dispensing system, containing a piezoelectric actuator, displacement amplifier, and needle-valve nozzle, was developed for high-viscosity fluids. Hydrogels served as non-Newtonian fluids, and a power-law model was employed to analyze the viscosity up to a shear rate of 1,000 (1/s). The needle, driven by a trapezoidal signal, acted as a piston, and changes in the jetted droplet mass and length were measured by varying the needle displacement and frequency. The experimental results well-matched the predicted ones (error: 10%). The needle movement generated Couette–Poiseuille flow, which increased the fluid shear rate and induced shear-thinning, in the dispensing chamber, thereby reducing the viscosity. A large number of droplets with similar masses (within 5%) and lengths were obtained at high driving stokes and frequencies. This analytical model is suitable for designing precise droplet-dispensing systems.


Keywords: Piezoelectric jet dispenser, Shear thinning, Droplet characteristics, CFD simulation

Acknowledgments

This work was partially supported by the [GRRC program of Gyeonggi province] grant number [GRRC-KPU2020-B01], and [Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE)] (P0008458; the HRD Program for Industrial Innovation).


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Da-Hoon Park

M.S. in the Department of Mechanical Design Engineering, Tech University of Korea. His research interests are 3D Printer Technology Including Piezo Actuator Control and Engineering Aimulation.

E-mail: ekgns123123@tukorea.ac.kr

Kwang Kim

Professor in the Department of Mechanical Design Engineering, Tech University of Korea. His research interests are 3D Printer and Hydraulic Attachments Design, and Food Waste Drying Technology.

E-mail: kimkwang@tukorea.ac.kr