不同极性牛顿流体的微尺度流动

发布时间：2018-02-24 13:07

本文关键词： 微尺度微圆管非线性分子极性边界层厚度　出处：《科学通报》2017年25期 　论文类型：期刊论文

【摘要】：极性是影响流体微尺度流动的重要因素.本文研究了去离子水(强极性,极性10.2)和异丙醇(中等极性,极性4)在0.04~24.8 MPa/m,半径7.5,5,2.5,1?m微管中的流动规律.结果表明,微尺度下流体流动不再遵循泊肃叶定律,流速偏低,且表现出非线性特征.随着压力梯度升高,边界层厚度不断减小,造成有效流动半径不断增大,导致了流动的非线性.当压力梯度升高到一定程度,边界层厚度稳定,非线性流过渡为线性流.流体极性越强,流固相互作用对流动影响越大,消除黏度影响后,去离子水的边界层厚度大于异丙醇,非线性流动的压力梯度上限低于异丙醇.
[Abstract]:Polarity is an important factor affecting microscale fluid flow. In this paper, deionized water (strong polarity, polarity 10.2) and isopropanol (moderate polarity, polarity 4) are studied in the range of 0.04 ~ 24.8 MPA / m, with a radius of 7.5? The flow pattern in m microtubules. The results show that the flow velocity is low and nonlinear, and the thickness of the boundary layer decreases with the increase of pressure gradient. When the pressure gradient is raised to a certain extent, the thickness of the boundary layer is stable, and the nonlinear flow is transformed into a linear flow. The stronger the fluid polarity, the greater the fluid-solid interaction affects the flow. The boundary layer thickness of deionized water is larger than that of isopropanol, and the upper limit of pressure gradient of nonlinear flow is lower than that of isopropanol.
【作者单位】：中国石油大学(北京)石油工程学院;
【基金】：国家重点基础研究发展计划(2015CB250902) 高等学校博士学科点专项科研基金(20130007120014) 国家自然科学基金(51574258,51674273)资助
【分类号】：O373

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