基于可变形微孔气室动力学特性的膜完整性识别机理研究

The application of ultrafiltration technology in water treatment puts forward stricter requirements on membrane integrity detection, while the mechanism and model of membrane integirty identification based on barometry have not been developed. The dynamic bubble behaviors from transformable micro-orifices have significant effect on pressure decay characteristics and membrane integrity identification. In the present project, visualization experiments will be carried out to investigate the dynamic characteristics of gas bubbles emerging through transformable micro-orifices from transformable chamber, so it is hopefully expected to explicitly observe and reveal the dynamics bubbles behaviors including bubbles emergence, growth and detachment, and then to well understand the mechanism of the effect of dynamic parameters, including the damage size, pressure change and membrane boundary, on bubble emergence; Furthermore, the dynamics theoretical model of gas chamber and micro-orifice would be established, and the response characteristics of chamber pressure decay due to parametric studies would be simulating analyzed, then the relationship between pressure decay and transformable micro-orifices would be revealed. In addition, dimensionless parameters and their selecting range of turning-point would be established to sign the pressure decay changing characteristics and the membrane integrity characterization. The expected results would be much help to promote the application and development of the membrane damage identification technologies.

超滤膜技术在水处理中的广泛应用迫切需要对膜完整性识别的理论基础、工作机制、物理模型开展深入研究。可变形微孔的气泡动力学特性和气室动力学特性是膜腔气室压力衰减和膜完整性识别的基础。拟对气相压力作用下可变形微孔的气泡运动特性开展可视化研究，分析测试、数值模拟可变形微孔处微观的气泡形成、生长、脱离的气泡行为及动力学，研究气相压力变化、微孔形貌尺寸、材料壁面特性等参数对气泡生长和脱离特性的影响；建立变形微孔的气室物理模型，构建气泡逸出过程中膜腔气室和膜破损微孔的动力学模型，探索膜破损微孔尺寸、原始压力、气室容积等因素对膜腔气室压力衰减响应特性的影响，揭示气室压力衰减和变形微孔耦合作用下气室压力与微孔形貌尺寸的关系规律；选择表征膜完整性转捩点的无量纲数参数和范围，用以判别气泡生长能力和表征气室压力衰减特性，表达膜破损当量直径。旨为膜完整性识别提供理论依据，促进水质安全健康技术的应用和发展。

超滤膜技术在水处理中的广泛应用迫切需要对膜完整性识别的理论基础、工作机制、物理模型开展深入研究。膜破损微孔的气泡动力学特性和气室动力学特性是膜腔气室压力衰减和膜完整性识别的基础。本项目对气相压力作用下膜破损微孔的气泡运动特性开展可视化研究，分析测试、数值模拟膜破损微孔气泡形成动力学，建立基于膜破损微孔气泡逸出的膜腔气室物理模型，构建气泡逸出过程中膜腔气室的压力衰减动力学模型，探索膜破损微孔尺寸、原始压力、气室容积等因素对膜腔气室压力衰减响应特性的影响，揭示气室压力衰减和微孔气泡逸出耦合作用下气室压力的变化规律；建立超滤膜系统的破损尺寸量化关系模型，表达膜破损当量直径。项目为膜完整性识别提供理论依据，有效促进水质安全健康技术的应用和发展。