在微重力中对合物-聚合物混合物的相场建模
Lauren Barnes1, Boris Khusid2, Lou Kondic1
1Department of Mathematical Sciences & Center for Applied Mathematics and Statistics, New Jersey Institute of Technology, Newark, NJ, USA.
NPJ microgravity
|September 1, 2025
概括
我们开发了一个理论模型来了解流体流如何影响合物-聚合物混合物的相分离. 微重力实验允许我们通过观察低面张力驱动的分离来验证我们的模型.
科学领域:
- 软物质物理学
- 材料科学
- 流体动力学
背景情况:
- 体聚合物混合物是研究相变的模型系统,表现出气体,液体和晶体相.
- 水力动力学在它们的相位分离中的作用仍然不太清楚,尤其是在微重力条件下.
研究的目的:
- 开发和验证合物-聚合物混合物相分离过程中的水力动力相互作用的理论模型.
- 在微重力环境中研究相隔动力学,尽量减少重力影响.
主要方法:
- 一个相场模型将Cahn-Hilliard方程与粘性流程的Stokes方程相结合.
- 在相界面上加入合物度依赖的粘度和科尔特韦格应力.
- 在国际空间站进行的二元合金试验 (BCAT) 视频显微镜数据的分析.
主要成果:
- 该模型成功地描述了微重力下的合物-聚合物混合物的水力动力相互作用.
- 在微重力条件下可视化低界面张力驱动的相分离.
- 在实验观察和模型预测之间进行了定量比较.
结论:
- 水力动力相互作用在合物-聚合物混合物的相分离中起着重要作用.
- 微重力实验对于分离和研究这些水力动力学效应至关重要.
- 开发的模型为了解体系统中的复杂流体行为提供了强大的框架.
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