基于Monte Carlo法强化管表面颗粒-析晶垢形成机理及预测模型研究

Enhanced tubes are widely used in cooling tower system as the condensers due to the high heat transfer performance, thus deemed an energy-saving technology which has wide application foreground. However, fouling will deposit on the surface of enhanced tubes after a long-term running which has a high thermal resistance and affects the heat transfer performance severely. Most of current research on the fouling of enhanced tubes only focused on single fouling, but the fouling of enhanced tubes in the application of cooling tower are combined fouling (Particulate & Precipitation fouling). Therefore, the current knowledge is not enough for researchers to understand the fouling on enhanced tubes in cooling tower. This study is proposed to investigate the characteristics of the fouling in enhanced tubes based on Monte Carlo method creatively, and the interactive performance of particulate fouling and precipitation fouling in the combined fouling of enhanced tubes would be studied for the first time. Firstly, the quantitative relationship between combined fouling and single fouling, and the specified correlations of critical parameters affecting development process of fouling would be determined experimentally. Secondly, a dynamic Monte Carlo simulation approach would be developed to visually simulate the growing of the combined fouling on enhanced surface. The interactive performance and force mechanical behavior between different kinds of single fouling in the development of combined fouling would be investigated based on the Monte Carlo simulation. Finally, a modified Kern-Seaton model will be developed for the combined fouling, and a generalized prediction model of combined fouling resistance on enhanced tubes would be developed as well. This study will enrich and develop the knowledge system of combined fouling on irregular surface, and also provide technological support for the design, manufacture and use of enhanced tubes in industry.

强化管因良好的传热性能作为冷却水换热器具有可观的节能效益和应用前景，但面临结垢问题。目前强化管污垢的研究主要针对一元污垢，而冷却塔水系统中强化管表面污垢呈二元交互特点，现有理论不能科学描述二元混合污垢成垢机理。本项目创造性提出基于Monte Carlo法研究强化管微观内表面二元污垢特性，首次从理论和实验角度研究二元污垢交互机理与生长机制。首先，实验确定强化管表面二元污垢组分间的定量关系及成垢过程中关键行为参数的定量数学描述。其次，基于Monte Carlo法建立多肋粗糙表面二元污垢形成过程的动态可视化模拟方法，揭示强化管表面多场耦合下各组分致垢物在成垢过程中的交互行为特性和力学规律。最后，提出二元污垢的Kern-Seaton模型机制的数学描述，建立强化管表面二元污垢热阻的预测模型。本研究为丰富和发展换热器表面多元污垢科学理论做出贡献，也为强化管设计、制作、应用提供理论依据与技术支持。

本项目创造性提出基于Monte Carlo法研究强化管微观内表面二元污垢特性，首次从理论和实验角度研究二元污垢交互机理与生长机制。为丰富和发展换热器表面多元污垢科学理论做出贡献，也为强化管设计、制作、应用提供理论依据与技术支持。首先，实验确定强化管表面二元污垢组分间的定量关系及成垢过程中关键行为参数的定量数学描述。其次，基于Monte Carlo法建立多肋粗糙表面二元污垢形成过程的动态可视化模拟方法，揭示强化管表面多场耦合下各组分致垢物在成垢过程中的交互行为特性和力学规律。最后，提出二元污垢的Kern-Seaton模型机制的数学描述，建立强化管表面二元污垢热阻的预测模型。