通过纤维蒸膜进行水淡化3D模拟
Mostafa J Gildeh1, Nishant Bhatta1, James T McLeskey2
1Department of Mechanical and Aerospace Engineering, NC State University, Raleigh 27606, North Carolina, United States.
本研究引入了使用现实的虚拟膜进行直接接触膜蒸 (DCMD) 的新计算模型. 该框架优化了DCMD膜,以实现高效的淡水生产和防洪.
科学领域:
- 膜科学与技术 膜科学与技术
- 计算建模 计算建模
- 淡化盐水是什么?淡化盐水是什么?
背景情况:
- 直接接触膜蒸 (DCMD) 是一种利用低度热的节能海水淡化方法.
- 优化DCMD性能需要了解复杂的膜微结构及其与流体动力学的相互作用.
- 现有的模型往往缺乏足够的保真度来表示现实的纤维膜结构.
研究的目的:
- 开发一个新的数值框架来模拟DCMD与现实的膜微结构.
- 研究膜厚度和多孔度对关键DCMD性能指标的影响.
- 量化温度极化的影响,并实现优化膜设计.
主要方法:
- 使用离散元件方法 (DEM) 生成虚拟电膜微结构.
- 内部孔腔形态学方法 (PMM) 代码用于预测空气-水接口 (AWI) 和液体进入压力 (LEP).
- 解决纳维埃-斯托克斯方程和物种方程来模拟通过膜的蒸汽运输.
主要成果:
- 模拟显示了膜厚度和孔隙性对LEP,空气溶解和蒸汽传输的抵消作用.
- 量化了温度两极分化对淡水生产率的不利影响.
- 证明了框架能够分析现实的纤维膜几何形状的能力.
结论:
- 开发的计算框架使DCMD过程的真实模拟成为可能.
- 提供了设计和优化纤维式DCMD膜的见解,以提高流量和防洪性能.
- 促进DCMD技术的进步,以实现高效的海水淡化.
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