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EFFECT OF PLASTICIZER ON THE MICROSTRUCTURE OF PS/PVC BLENDS

Chinese Journal of Polymer Science 1996年第3期14卷 193-198页

作者：乔金梁 D.Vesely Beijing Research Institute of Chemical Industry The Ministry of Chemical Industry Beijing 100013 Department of Material Technology Brunel University Uxbridge London UB8 3PH UK

In this work, controlling of the particle size of PVC in PS/PVC blends was studied. It is shown that viscosity ratio and particle size can be changed by adding a third composition, such as plasticizers, and the distribution of the third composition in two phases plays a very important role in controlling viscosity ratio and particle size. When DOP was used as the plasticizer of PVC in PS/PVC blends, the particle size of PVC could not be reduced due to the transference of DOP into PS phase. When polycaprolactone (PCL) was used as the plasticizer of PVC in the same blends, the particle size of PVC could be descreased obviously because PCL does not migrate to PS phase.

关键词： viscosity ratio microstructure polystyrene PVC blending plasticizer

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Coalescence dynamics of two droplets of different viscosities in T-junction microchannel with a funnel-typed expansion chamber

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Chinese Journal of Chemical Engineering 2021年第10期34卷 43-52页

作者： Weixi Guo Chunying Zhu Taotao Fu Youguang Ma State Key Laboratory of Chemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

The coalescence behavior of two droplets with different viscosities in the funnel-typed expansion chamber in T-junction microchannel was investigated experimentally and compared with droplet coalescence of the same *** types of coalescence regimes were observed:contact non-coalescence,squeeze non-coalescence,two-droplet coalescence and pinch-off *** droplet coalescence of different viscosities,the operating range of non-coalescence becomes narrowed compared to the droplet coalescence of same viscosity,and it shrinks with increasing viscosity ratioηof two droplets,indicating that the difference in the viscosity of two droplets is conducive to coalescence,especially when1viscosity ratio and droplet size on the film drainage time(Tdr)and critical capillary number(Ca)c)were studied *** was found that the film drainage time declined with the increase of average droplet size,which abided by power-law relation with the size difference and viscosity ratio of the two droplets:Tdr~(ld)^(0.25±0.04)and Tdr~(η)^(﹣0.1±0.02).For droplet coalescence of same viscosity,the relation of critical capillary number with two-phase viscosity ratio and dimensionless droplet size is Cac=0.48λ^(0.26)l^(﹣2.64),while for droplet coalescence of different viscosities,the scaling of critical capillary number with dimensionless average droplet size,dimensionless droplet size difference and viscosity ratio of two droplets is Cac=0.11η^(﹣0.07)ls^(﹣2.23)l^(0.16)_(d).

关键词： Microchannel Droplet Coalescence viscosity ratio Critical capillary number

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Analysis of Entropy Generation in a Rectangular Porous Duct

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Journal of Applied Mathematics and Physics 2016年第7期4卷 1336-1343页

作者： Shyam Lal Yadav Ashok Kumar Singh Department of Mathematics Institute of Science Banaras Hindu University Varanasi India

In this paper, we have considered a fully developed flow of a viscous incompressible fluid in a rectangular porous duct saturated with the same fluid. The duct is heated from the bottom for forced and mixed convection. The Brinkman model is used to simulate the momentum transfer in the porous duct. Using the momentum and thermal energy equations, the entropy generation has been obtained due to the heat transfer, viscous and Darcy dissipations. It is found from the mathematical analysis that the entropy generation is double when the viscous as well as the Darcy dissipations terms are taken in the thermal energy equation in comparison when the viscous as well as the Darcy dissipations terms are not taken in the thermal energy equation. This result clearly shows that there is no need of taking the viscous and Darcy dissipations terms in the thermal energy equation to obtain the entropy generation.

关键词： Brinkman Model Heat Flux Fully Developed Flow viscosity ratio Entropy Generation

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