液滴在大振幅振荡剪切流动中的非线性行为研究

NONLINEAR BEHAVIORS OF A DROP UNDERGOING LARGE AMPLITUDE OSCILLATORY SHEAR FLOW

利用YB模型预测了黏性液滴在黏性基质中的形状和取向的非线性变化,并对比前人的理论和实验工作,讨论了YB模型大振幅剪切流场中的适用性．还着重讨论了非线性行为的评估,提出了“峰高比加和法”和“峰面积比加和法”两种新的评估方法．

Nonlinear viscoelastic behavior of immiscible polymer blends in large amplitude oscillatory shear flow （LAOS） is partly due to nonlinear morphological evolution of its interface. In order to understand the interfacial evolution of immiscible polymer blends in LAOS, a constitutive model by Yu and Bousmina[51 is used. Its predicting results are compared with both the experimental and theoretical results of previous studies. As a result, it is found that YB model can reasonably reproduce the experimental results in the evolution of drop length and orientation angle. In addition, a detailed discussion is given on the evaluation of nonlinearity of the interface.