• Title/Summary/Keyword: dynamic rheology

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Studies on Rheological Properties of High Solid Coating Colors(Part 2) - Effect of Rheology Modifiers on High-Shear Viscosity and Dynamic Penetration Behavior - (고농도 도공액의 유동특성에 관한 연구(제2보) - 유동성 조절제가 고전단 점도 및 동적 침투특성에 미치는 영향 -)

  • Yoo, Sung-Jong;Cho, Byoung-Uk;Lee, Yong-Kyu
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.43 no.3
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    • pp.121-127
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    • 2011

  • This study used two types of rheology modifiers including an alkali-swellable emulsion (ASE) and an surface-adhesion emulsion (SAE) to elucidate their effects on high shear viscosity and dynamic penetration behavior among the flow properties of high solids coating. Since rheology under high shear and dynamic penetration behavior significantly affect the quality of coated paper in case of high solids coating, it is very important to examine the variations in rheology of high solids coating color by rheology modifier. It was found that the high solids coating color prepared with the SAE type showed superior dynamic penetration behavior and high shear viscosity than that with the ASE type rheology modifier.

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Droplet deformability and emulsion rheology: steady and dynamic behavior

  • Saiki Yasushi;Prestidge Clive A.
    • Korea-Australia Rheology Journal
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    • v.17 no.4
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    • pp.191-198
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    • 2005

  • The static and dynamic rheological behavior of concentrated sodium dodecylsulfate (SDS) stabilized, deformability controllable polydimethylsiloxane (PDMS) emulsions is reported and comparisons made with silica (hard sphere) suspensions. Steady-mode measurements indicate 'hard' (viscoelastic) droplets behave as hard spheres, while 'soft' (viscous) droplets induce structural flexibility of the emulsion against shear. Dynamic-mode measurements reveal that viscoelasticity of droplets provides the great magnitude of elasticity for the 'hard' emulsion, while formation of planar films between droplets is the origin of the elasticity of 'soft' emulsions. Combination of steady and dynamic rheological behavior has enabled depiction of droplet structure evolution in relation to the shear stress applied, especially by taking advantage of the normal force that reflects the transient deformation of droplets.

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Solid Particle Behavior Analysis in Rheology Material by Fortran 90 (레오로지 소재의 고상입자 변형거동 해석)

  • Kwon, K.Y.;Kang, C.G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.10a
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    • pp.234-237
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    • 2008

  • It was reported that the semi-solid forming process has many advantages over the conventional forming process, such as a long die life, good mechanical properties and energy savings. It is very important, however, to control liquid segregation to gain mechanical property improvement of materials. During forming process, Rheology material has complex characteristics, thixotropic behavior. Also, difference of velocity between solid and liquid in the semi-solid state material makes a liquid segregation and specific stress variation. Therefore, it is difficult for a numerical simulation of the rheology Process to be Performed. General Plastic or fluid dynamic analysis is not suitable for the behavior of rheology material. The behavior and stress of solid particle in the rheology material during forging process is affected by viscosity, temperature and solid fraction. In this study, compression experiments of aluminum alloy were performed under each other tool shape. In addition, the dynamics behavior compare with Okano equation to Power law model which is viscosity equation.

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Dynamic Simulation of Solid Particle Considering Change by Viscosity in Rheology Material (반응고 재료에서 점성을 고려한 고상입자의 거동예측을 위한 수치모사 해석)

  • Kwon, K.Y.;Kang, C.G.
    • Transactions of Materials Processing
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    • v.18 no.1
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    • pp.26-38
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    • 2009

  • It was reported that the semi-solid forming process has many advantages over the conventional forming process, such as a long die life, good mechanical properties and energy savings. It is very important, however, to control liquid segregation to gain mechanical property improvement of materials. During forming process, rheology material has complex characteristics, thixotropic behavior. Also, difference of velocity between solid and liquid in the semi-solid state material makes a liquid segregation and specific stress variation. Therefore, it is difficult for a numerical simulation of the rheology process to be performed. General plastic or fluid dynamic analysis is not suitable for the behavior of rheology material. The behavior and stress of solid particle in the rheology material during forging process is affected by viscosity, temperature and solid fraction. In this study, compression experiments of aluminum alloy were performed under each other tool shape which is rectangle shape(square array), rectangle shape(hexagonal array), and free shape tool. In addition, the dynamics behavior compare with Okano equation to power law model which is viscosity equation.

  • https://doi.org/10.5228/KSPP.2009.18.1.026 인용 PDF KSCI

Correlation Analysis between the Rheology Parameters of Concrete and the Rheological Parameters of Wet Sieving Mortar (콘크리트 레올로지 정수와 Wet Sieving 모르타르 레올로지 정수의 상관관계 분석)

  • Kim, In-Tae;Lee, Yu-Jeong;Han, Dong-Yeop
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.05a
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    • pp.103-104
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    • 2023

  • In this study, the correlation between the rheolog y parameter of fresh concrete and the rheology parameter of wet sieving mortar was analyzed for analyzing to possibility predicting the rheology parameter of fresh concrete. Through the experiment, the dynamic yield stress and plastic viscosity of concrete and wet sieving mortar show a direct proportional relationship, and the two data had a correlation. Therefore, it is thought that it is possible to predict the rheology parameter of fresh concrete through the rheology parameter of wet sieving mortar. However, in order to more accurately predict the rheology parameter of fresh concrete, it is need additional relationship analysis by collecting more rheology parameter data of fresh concrete and wet sieving mortar.

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