粘弹性流体带电射流非线性稳定性研究

项目名称： 粘弹性流体带电射流非线性稳定性研究

项目编号： No.11272307

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 李芳

作者单位： 中国科学技术大学

项目金额： 90万元

中文摘要： 近年来，由于它们的独特优势和应用潜力，电雾化和电纺丝一直受到工业界的广泛关注。同时，电雾化和电纺丝中存在的电流体力学现象为基础理论和实验研究提供了丰富的背景和内容。特别，在电雾化和电纺丝实验中经常使用高分子聚合体材料，它们属于粘弹性流体的范畴。而由于问题的复杂性，目前只有少数的带电流体射流研究考虑了流体的粘弹性性质。本项目以电雾化和电纺丝为研究背景，以牛顿流体和粘弹性流体带电射流为研究对象，采用理论推导、数值模拟和实验观测相结合的方法，分别研究牛顿流体和粘弹性流体在径向电场作用下的局部绝对与对流不稳定性、线性整体稳定性、轴对称模式的长波非线性不稳定性以及三维非线性不稳定性，研究电场及粘弹性、表面张力等物性参数对射流轴对称和第一非轴对称模式的不稳定行为的影响规律，为实际应用提供指导性建议。

中文关键词： 稳定性；射流；粘弹性；电场；非线性

英文摘要： In the last decades electrospraying and electrospinning have attracted wide attention due to their intriguing advantages and potential industrial applications. Meanwhile, the electrohydrodynamic phenomena existing in electrospraying and electrospinning experiments provide abundant background and content for basic theoretical and experimental research. Particularly, polymer materials of high molecule are frequently used in electrospraying and electrospinning experiments, which are within the scope of viscoelastic fluids. However, owing to the complexity of the problem itself, up to now only a few reports on electrified jets have considered the viscoelasticity of liquid. Taking electrospraying and electrospinning as research background, and taking electrified Newtonian and viscoelastic liquid jets as research objects, in this project we use the theoretical, numerical and experimental methods to study, respectively, the local absolute and convective instability, linear global stability, long-wave nonlinear instability of the axisymmetric mode and three dimensional nonlinear instability of the Newtonian and viscoelastic liquid jets under radial electric field. We also study the effects of the electric field and liquid physical properties, such as viscoelasticity and surface tension, on the instability of the axisymm

英文关键词： instability；jet；viscoelasticity；electric field；nonlinear