Hand-held, automatic capillary viscometer for analysis of Newtonian and non-Newtonian fluids
- Authors
- Lee, Eunjung; Kim, Byeongyeon; Choi, Sungyoung
- Issue Date
- Oct-2020
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Viscometer; Non-Newtonian fluid; Open-source pump; Microfluidics; Pressure sensor
- Citation
- SENSORS AND ACTUATORS A-PHYSICAL, v.313, pp.1 - 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS A-PHYSICAL
- Volume
- 313
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/144987
- DOI
- 10.1016/j.sna.2020.112176
- ISSN
- 0924-4247
- Abstract
- Despite advances in measuring fluid viscosity, we still lack portable viscometers to analyze shear ratevarying fluid characteristics in the form of open-source hardware that non-expert users can easily make and use. We present a hand-held, automatic capillary viscometer, termed Viscopette which can be fabricated simply by assembling globally available mechanical (a stepper motor and an inline pressure sensor), fluidic (a positive-displacement pipette and a cut tubing piece), electronic (an Arduino board) parts in a 3D-printed housing. The Viscopette is specifically designed to improve user experience by adopting how to use commercial micropipettes, and fits within 7.3 cm x 7.3 cm x 38.8 cm (without the cut tubing piece) with an overall weight of 437 g for portable use. By exploiting the high level of controllability of the open-source microcontroller, the Viscopettes enables time-varying shear-rate (or flow-rate) control for viscosity analysis, and simple viscosity measurement by calculating the ratio of a pressure value measured using the inline pressure sensor and a set flow-rate condition. With the advantages of easeof-use, portability, and shear-rate controllability, we demonstrate the Viscopette's ability to accurately analyze Newtonian and non-Newtonian fluids. Our method addresses the unmet need in portable, highperformance viscometers suitable for use as an open-source equipment, which can facilitate on-site, accurate viscosity analysis even by non-expert users.
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