Viscous Dissipation of Polymer Melt in Micro Channels and Macro Channels

Abstract:

Viscous dissipation is the key factor impacting flowing characteristics of polymer melt. In order to study the difference between micro scale and macro scale, experimental studies of viscous dissipation at various shear rate were investigated with several polymers, including PMMA and HDPE, at different temperature when melts flow through 1000μm,500μm,350μm diameter channels of identical aspects ratio in the paper. The results indicate that the temperature rises caused by viscous dissipation increase with increasing shear rate and the temperature rise for some shear rate decreases with increasing melts temperature. The temperature rises decrease significantly with the reduction of the characteristic size of micro channel at the same shear rate. However, the average temperature rises per unit length increase when the character size of channel decreases. This indicates the shear friction gradually increases with the decrease of channel characteristic size. Therefore polymer melt viscous dissipation effects of micro scale dimensions are different from that of macro-scale dimensions.

• Periodical: Key Engineering Materials (Volumes 609-610)
• Pages: 521-525
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.609-610.521
• Online since: April 2014
• Authors: Bin Xu*, Xiao Yu An, Liang Chao Li, Guang Ming Li
• Keywords: Average Temperature Rise, Micro Injection Molding, Micro-Channel, Polymer Melts, Viscous Dissipation

References

[1] Shen Y K, Wu W Y. J, An analysis of the three-dimensional micro-injection molding, J. International Communications in Heat and Mass Transfer. 29 (2002) 423-431.

DOI: 10.1016/s0735-1933(02)00331-7

[2] Kim D S, Lee K C, Kwon T H, Micro-channel filling flow considering surface tension effect, J. Journal of Micromechanics and Microengineering. 12(2002) 236-246.

DOI: 10.1088/0960-1317/12/3/307

[3] Piotter V, Mueller K, Plewa K, Performance and simulation of thermoplastic micro injection molding, J. Microsystem Technologies. 8(2002) 387-390.

DOI: 10.1007/s00542-002-0178-6

[4] D. G. Yao, B. Kim, Simulation of the filling process in micro channels for polymeric materials, J. Micromech. Microeng. 12(2002) 604-610.

DOI: 10.1088/0960-1317/12/5/314

[5] Yu L Y, Koh C G, Lee L J, Experimental investigation and numerical simulation of injection molding with micro-features, J. Polymer Engineering and Science. 42(2002) 871-888.

DOI: 10.1002/pen.10998

[6] CHIEN R D, JONG W R, CHEN S C, Study on Rheological Behavior of Polymer Melt Flowing through Micro-channels Considering the Wall-slip Effect, J. Journal of Micromechanics and Microengineering. 15(2005) 1389-1396.

DOI: 10.1088/0960-1317/15/8/003

[7] CHEN S C, TSAI R I, CHIEN R D, Preliminary study of polymer melt rheological behavior flowing through micro-channels, J. International Communications in Heat and Mass Transfer., 32(2005) 501-510.

DOI: 10.1016/j.icheatmasstransfer.2004.07.004

[8] CHEN C S, CHEN S C, LIAW L W, Rheological behavior of POM polymer melt flowing through micro-channels, J. European Polymer Journal. 44(2008) 1891-1898.

DOI: 10.1016/j.eurpolymj.2008.03.007

[9] YU Tongmin，WEI Yuxin，XU Bin, et al. Research on Viscous Dissipation of Melt in Filling Flow of Micro Injection Molding[C]/Proceedings of the 8th International Conference on Frontiers of Design and Manufacturing. Tianjin: Chinese Society of Mechanical Engineers, 2008: 156-163.

[10] KOO J and KLEINSTREUER C, Liquid flow in microchannels: experimental observations and computational analyses of microfluidics effects, J. J. Micromech. Microeng. 13(2003) 568-579.

DOI: 10.1088/0960-1317/13/5/307

[11] MORINI G L, Viscous heating in liquid flows in micro-channels , J. Int. J. Heat Mass Transfer. 48(2005) 3637-3647.

DOI: 10.1016/j.ijheatmasstransfer.2005.01.011

[12] Bu Wen-feng, Liu Zhi-gang, ZHAO Yao-hua. Experimental study and numerical simulation of viscous dissipation effect for flow in microtube, J. Journal of Harbin institute of technology. 40(2008) 160-163.

[13] Guan Nin, Liu Zhi-gang, Liang Shi-Qiang, Study of viscous dissipation effect for liquid flow in microtube, J. Progress in Natural Science. 18 (2008) 1297-1303.

[14] Xu, Bin, Wang, Minjie, Yu, Tongmin, et al, Viscous dissipation influencing viscosity of polymer melt in micro channels , Journal of Mechanical science and technology . 7(2010), 1417-1423.

DOI: 10.1007/s12206-010-0420-6

[15] Xu, Bin, Wang, Minjie, Yu, Tongmin, et al, A study of novel viscous dissipation measurement for polymer melts in microchannels Proceeding of the institution of mechanical part- C -Journal of Mechanical Engineering Science. C9 (2010), 2027-(2035).

DOI: 10.1243/09544062jmes1942