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Viscous dissipation influencing viscosity of polymer melt in micro channels

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Abstract

Determination of melt rheological behavior within micro-structured geometry is very important for the accurate simulation modeling of micro-molding. Yet studies on the rheological behavior of polymer melts, flowing through micro channels, are complicated due to a large number of factors affecting the melt viscosity. One factor, viscous dissipation, is investigated in the current work through a novel experimental technique to determine the viscous dissipation of a polymer melt flowing through several micro channels with identical aspect ratio. Relative tests are conducted with the melt of high density polyethylene (HDPE) at different temperatures being extruded through the capillary dies with diameters 1000μm, 500μm and 350μm, respectively. It was found that the temperature rise due to viscous dissipation decreases significantly with the reduction of the characteristic size of micro channel at the same shear rate. In addition, based on the suggested model of radial temperature distribution, the influence of viscous heating on the melt viscosity is investigated. The results indicate that viscous dissipation does not play a significant role.

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Authors and Affiliations

  1. Key Laboratory for Precision & Non-traditiona l Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Bin Xu, Minjie Wang, Tongmin Yu & Danyang Zhao

Authors
  1. Bin Xu
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  2. Minjie Wang
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  3. Tongmin Yu
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  4. Danyang Zhao
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Corresponding author

Correspondence to Bin Xu.

Additional information

This paper was recommended for publication in revised form by Associate Editor Jun Sang Park

Bin Xu received his Masters’ degree in Mechanical Engineering from Liaoning University of Technology, People’s Republic of China, in 2006. He is currently a Ph.D candidate of the School of Mechanical Engineering at Dalian University of Technology, People’s Republic of China. His principal interests are in the areas of micro injection molding, including micro fluid, micro mold design, mainly through experimental and numerical means.

Minjie Wang received the Ph.D degree in Mechanical Engineering from Dalian University of Technology, People’s Republic of China, in 1989. He is currently a professor of School of Mechanical Engineering at Dalian University of Technology. His research interests are in mold technology, polymer molding and high speed machining.

Tongmin Yu is currently a professor of the School of Mechanical Engineering at Dalian University of Technology. His research interests are in mold design and fabrication technology, mold CAD/CAE, precision polymer injection molding and polymer micro injection molding

Danyang Zhao received his Masters’ and Ph.D degrees in Mechanical Engineering from Dalian University of Technology in 2003 and 2007, respectively. He is currently an associate professor at Dalian University of Technology in China. His research interests include the non-Newtonian fluid dynamics of polymer injection/extrusion processes from micro to macro scale, especially the rheological characterization and wall slip of melt flowing process, and mold/die design.

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Xu, B., Wang, M., Yu, T. et al. Viscous dissipation influencing viscosity of polymer melt in micro channels. J Mech Sci Technol 24, 1417–1423 (2010). https://doi.org/10.1007/s12206-010-0420-6

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  • DOI: https://doi.org/10.1007/s12206-010-0420-6

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