[논문]점탄성유체의 Capillary Breakup 가시화 및 신장유변물성 측정

전현우; 최찬혁; 김병훈; 박진수

doi:10.5407/jksv.2021.19.1.081

점탄성유체의 Capillary Breakup 가시화 및 신장유변물성 측정
Capillary Breakup of Viscoelastic Fluid and its Extensional Rheology 원문보기

한국가시화정보학회지= Journal of the Korean society of visualization, v.19 no.1, 2021년, pp.81 - 87

전현우 (School of Mechanical Engineering, Chonnam National University) , 최찬혁 (School of Mechanical Engineering, Chonnam National University) , 김병훈 (School of Mechanical Engineering, Chonnam National University) , 박진수 (School of Mechanical Engineering, Chonnam National University)

Abstract ▼ AI-Helper

Extensional flow of viscoelastic fluids is widely utilized in various industrial processes such as electrospinning, 3D printing and plastic injection molding. Extensional rheological properties, such as apparent viscosity and relaxation time, play an important role in the design and evaluation of the viscoelastic fluid-involved processes. In this work, we propose a lab-built capillary breakup extensional rheometer (CaBER) based on flow image processing to investigate the capillary breakup of polyethylene oxide (PEO) solution and its extensional rheological properties. We found that the apparent extensional viscosity and extensional relaxation time of the PEO solution are independent of the strike time. The proposed CaBER is expected to be applied to characterization of the extensional rheological properties of viscoelastic fluids at low cost with high precision.

주제어

표/그림 (8)

그림 Fig. 1. Schematic of the capillary breakup extensional rheometry system. The motorized z-stage allows the formation of a fluid filament, and the high-speed camera is used to capture the images.
그림 Fig. 2. (a) Working principle of the capillary breakup extensional rheometry. (b) The midpoint filament geometry at t ≥ 0 with normal stress σ_rr and σ_zz.
그림 Fig. 3. Non-dimensional filament diameter with respect to time in the CaBER experiments. All the diameter values were measured after the upper plate reached the final aspect ratio Λ_f.
표 Table 1. Properties of PEO/water solutions with M_w = 1×10⁶ g/mol. All properties was measured at room temperature T = 20 ℃. λ_E was extracted at t_s = 65 ms. For the error in λ_E, standard deviation was applied with data from at least 5 experiments. Ec_i is calculated at t = 0.
그림 Fig. 4. Filament profiles with varying strike time of 3 wt% PEO/water solution. t_b is the break-up time when the filament breaks.
그림 Fig. 5. Filament diameter of 3 wt% PEO/water solution at variable strike time 65–975 ms.
그림 Fig. 6. Change of the extensional relaxation time according to strike time 65-975 ms. Low concentration about 1-2 wt% was not conducted at high stirke time 497-975 ms because the filaments was broken before the upper plate reach the final height. The error bar is the standard deviation of the mean.
그림 Fig. 7. Apparent extensional viscosity according to extension rate of 3 wt% PEO/water solution. Extension rate of dash line is 20.4-24.5 s^-1. A smaller number of data is expressed than the actual data.

참고문헌 (12)

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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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