Droplet Mass and Length in a Piezoelectric Needle-valve Jetting Dispenser for a Power-law Fluid
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 simulationAcknowledgments
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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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
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