• Title/Summary/Keyword: 슬릿 점도계

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Simultaneous measurements of red blood cell aggregation and blood viscosity in a slit rheometry with light transmission analysis (광 투사법을 이용한 슬릿 점도계에서의 적혈구 응집성 및 점도 측정에 관한 연구)

  • Park, Myung-Su;Ku, Yun-Hee;Shin, Se-Hyun;Suh, Jang-Su
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.1678-1681
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    • 2004
  • The light-transmission technique has been applied to a slit rheometer for measuring red blood cell aggregation as well as blood viscosity over a range of shear rates. For measurement of blood viscosity and aggregation, instantaneous pressure and transmit-light intensity are measured with time. Using a precision pressure measurement, one can determine the shear stress and shear rate. In addition, a transmitted light through a blood sample indicates degree of RBC aggregation. With abruptly flowing with high shear rate, RBCs rapidly disaggregate and the intensity of the transmitted light becomes low. When continuously flowing with decreasing shear rate, RBCs tend to re-aggregate and the corresponding transmit-intensity gradually increases with time. The light intensity as a degree of RBC aggregation is plotted against shear rate and compared with blood viscosity. The advantages of this design are dual measurement at a time, simplicity, i.e., ease of operation and no moving parts, low cost, short operating time, and the disposable kit which is contacted with blood sample.

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Study on a rheology of PS/PP blends flowing in a micro channel (마이크로 채널을 흐르는 PS/PP 블렌드의 유변학적 특성에 관한 연구)

  • Son, Young-Gon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.3
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    • pp.1023-1026
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    • 2010
  • In this paper, rheological property of polymer blends in a confined geometry was investigated. The shear viscosity was measured in a capillary rheometer incorporated with a specially designed piston and three slit dies having 0.1, 0.2 and 0.5 mm in thickness. It was observed that the viscosity of polymer blends does not depend on the die size when the phase of polymer blends is a sea-island structure. However, when the phase of polymer blends is a co-continuous structure, the viscosity of the blends was dependent on the die size. By additional investigations, this result is attributed to the slip phenomenon between polymer phases in the blends.