由蒸发和沉积驱动的合膜干燥中的微结构演变:格子博尔兹曼模拟和数学模型
Jinseong Yun1, Byoungjin Chun1, Hyun Wook Jung1
1Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Republic of Korea. bjchun@grtrkr.korea.ac.kr.
Soft matter
|March 3, 2025
概括
在合膜干燥过程中颗粒的分布取决于蒸发和沉速度. 模拟和新模型揭示了这些因素如何决定最终的薄膜微观结构和晶体形成.
科学领域:
- 材料科学 材料科学 材料科学
- 流体动力学 流体动力学
- 计算物理 计算物理
背景情况:
- 合膜的特性对于应用至关重要.
- 了解干燥过程中的粒子动态是控制薄膜微观结构的关键.
- 以前的模型往往没有详细考虑竞争的蒸发和沉效应.
研究的目的:
- 为了研究垂直干燥过程中的环状颗粒动力学.
- 确定控制粒子分布和薄膜形成的关键参数.
- 开发一种用于合膜干燥的预测模型.
主要方法:
- 使用格子博尔兹曼方法进行模拟.
- 开发一个一维的数学干燥模型.
- 分析粒子积累和结晶现象.
主要成果:
- 颗粒分布由干燥Péclet数 (Pe) 和沉积Péclet数 (Pe) 控制.
- 高蒸发率 (Pe ≫ Pesed) 会导致顶层的积累和结晶.
- 主导沉积 (Pe ≪ Pesed) 会导致底层的积累和结晶.
- 开发的模型在数量上与各种Pe和Pesed值的模拟结果相匹配.
结论:
- 干燥和沉动态极大地影响着体膜的微观结构质量.
- 建立了新的干燥模式地图,定义了蒸发,扩散和沉占主导地位的区域.
- 这些发现为优化合膜制造提供了一个框架.
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