Viscous dissipation effects of polymer melts in micro-channels

doi:10.3969/j.issn.0438-1157.2013.08.011

CIESC Journal ›› 2013, Vol. 64 ›› Issue (8): 2781-2787.DOI: 10.3969/j.issn.0438-1157.2013.08.011

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Viscous dissipation effects of polymer melts in micro-channels

YU Tongmin, YONG Heng, BEI Haixin, JIAO Xu

School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China

Received:2012-12-20 Revised:2013-02-26 Online:2013-08-05 Published:2013-08-05
Supported by:
supported by the National Natural Science Foundation of China(51175060)and the National Basic Research Program of China(2012CB025905).

微尺度通道中聚合物熔体的黏性耗散效应

于同敏, 永恒, 贝海鑫, 焦旭

大连理工大学机械工程学院, 辽宁大连 116024

通讯作者: 于同敏(1953- ),男,教授。
作者简介:于同敏(1953- ),男,教授。
基金资助:
国家自然科学基金项目(51175060);国家重点基础研究发展计划项目(2012CB025905)。

Abstract

Abstract: The temperature increase of polyformaldehyde(POM)and polystyrene(PS)melts at the outlet of circular and rectangular micro-channels with the same aspect ratio and diameter/equivalent diameter of 350 and 500 μm was measured at different shear rates using two-cylinder capillary rheometer and self-developed viscous dissipation measurement device.The viscous dissipation and its effect on flow behavior of polymer melt in micro-channels were investigated.The results show that the viscous dissipation is enhanced obviously with the increase of shear rate and diameters/equivalent diameter value in the micro-channels.The viscous dissipation in the rectangular channel is much stronger than that in the circular one.Under the same experimental conditions,the temperature increase at the outlet of crystalline POM melt is larger than that of amorphous PS melt due to viscous dissipation.

Key words: micro-channels, polymer melt, viscous dissipation, outlet temperature rise

摘要： 以双料筒毛细管流变仪和自行研制的黏性耗散测量装置为实验平台,通过对聚甲醛(POM)和聚苯乙烯(PS)两种聚合物熔体在不同剪切速率下,流经长径比相同的直径/当量直径分别为350 μm和500 μm的圆形及矩形截面微通道出口熔体温升的测量,研究了微尺度通道中聚合物熔体流动时的黏性耗散效应及其对熔体流变行为的影响。结果表明,两种截面微通道中的熔体黏性耗散效应均随剪切速率和微道直径/当量直径的增大而明显增强,其中矩形截面微通道中熔体的黏性耗散作用尤为强烈;且在相同实验条件下,结晶性的POM熔体因黏性耗散效应引起的微通道出口熔体温升值,高于非晶性的PS熔体。

关键词: 微通道, 聚合物熔体, 黏性耗散, 出口熔体温升

CLC Number:

TQ311
TG76

YU Tongmin, YONG Heng, BEI Haixin, JIAO Xu. Viscous dissipation effects of polymer melts in micro-channels[J]. CIESC Journal, 2013, 64(8): 2781-2787.

于同敏, 永恒, 贝海鑫, 焦旭. 微尺度通道中聚合物熔体的黏性耗散效应[J]. 化工学报, 2013, 64(8): 2781-2787.

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Viscous dissipation effects of polymer melts in micro-channels

微尺度通道中聚合物熔体的黏性耗散效应

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