Multiscale simulation for thermo-hydrodynamic lubrication of a polymeric liquid between parallel plate
Multiscale simulation for thermo-hydrodynamic lubrication of a polymeric liquid between parallel plate
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平行板之间聚合物液体热流体动力润滑的多尺度模拟
DOI：
10.1080/08927022.2014.951639
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Shugo Yasuda and Ryoichi Yamamoto
中科院分区：
文献类型：
--
作者：
K. Harii;H. Chudo;M. Ono;S. Okayasu;M. Matsuo;J. Ieda;S. Maekawa;and E. Saitoh;Shugo Yasuda and Ryoichi Yamamoto
用我们最近发展起来的多尺度模拟，即基于宏观热和动量传递的同步分子动力学模拟，分析了由平行板之间的短链组成的聚合物液体的热流体力学润滑。利用一个无量纲参数，即Nahme-Griffith数，研究了高分子链的流变性质和构象与局部粘性加热引起的温升之间的耦合关系。Nahme-Griffith数是指在充分改变粘度所需的特征温度下，粘性加热与热传导的比值。模拟结果表明，当Nahme-Griffith数大于1时，高分子链发生了强烈的剪切变稀和构象转变行为，并伴随着快速的温升。
Thermo-hydrodynamic lubrication of a polymeric liquid composed of short chains between parallel plates is analysed by a multi-scale simulation, i.e. the synchronised molecular dynamics simulation via macroscopic heat and momentum transfer, which has been recently developed by us. The rheological properties and conformation of polymer chains coupled with the temperature rise caused by local viscous heating are investigated with a non-dimensional parameter, i.e. the Nahme–Griffith number, which is defined by the ratio of the viscous heating to the thermal conduction at the characteristic temperature required to sufficiently change the viscosity. The present simulation demonstrates that strong shear thinning and transitional behaviour of the conformation of the polymer chains occurs with a rapid temperature rise when the Nahme–Griffith number exceeds unity.