Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Development and performance evaluation of a low-cost custom-made extensional rheometer

저비용 수제 연신레오미터 개발 및 성능 평가

  • Sihyun Kim (Department of Mechanical Information Engineering, Seoul National University of Science and Technology) ;
  • Hanbyeol Pak (Department of Mechanical Information Engineering, Seoul National University of Science and Technology) ;
  • Jeong-Hyun Kim (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology)
  • Received : 2023.02.22
  • Accepted : 2023.03.26
  • Published : 2023.03.31
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Abstract

Characterizing the extensional rheological properties of non-Newtonian fluids is crucial in many industrial processes, such as inkjet printing, injection molding, and fiber engineering. However, educational institutions and research laboratories with budget constraints have limited access to an expensive commercial extensional rheometer. In this study, we developed a custom-made extensional rheometer using a CO2 laser cutting machine and 3D printer. Furthermore, we utilized a smartphone with a low-cost microscopic lens for achieving a high spatial resolution of images. The aqueous polyethylene-oxide (PEO) solutions and a Boger fluid were prepared to characterize their extensional properties. A transition from a visco-capillary to an elasto-capillary regime was observed clearly through the developed rheometer. The extensional relaxation time and viscosity of the aqueous PEO solutions with a zero-shear viscosity of over 300 mPa·s could be quantified in the elasto-capillary regime. The extensional properties of the solutions with relatively small zero shear viscosity could be calculated using a smartphone's slow-motion feature with increasing temporal resolution of the images.

Keywords

Acknowledgement

이 성과는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임 (No. 2020R1C1C1005588).

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