自湿润流体流动传热机理及高效振荡热管特性

With the rapid development of microelectronics, the thermal management of electronic components has become an important problem to be solved. Heat pipe technology, due to its efficient heat transfer capability, becomes an effective way to solve electronics cooling problems. As a new working fluid, owning characteristics that induce the liquid spontaneously move to the high temperature dry out region, self-rewetting fluid causes widespread concern due to its heat transfer enhanced effect. Aim at clarifying the flow and heat transfer mechanisms, the macroscopic phenomena and microscopic physical nature of self-rewetting fluid will be studied in this project. The visualization experiments on pool boiling and bubble Marangoni flow in the tube will be operated carefully to clarify the flow and heat transfer mechanisms; The molecular dynamics theory will be used to study the compatibility of self-rewetting fluid components and the effective thermal conductivity of the fluid; Finally,the experimental study based on the heat transfer characteristics of self-rewetting fluid oscillating heat pipe(SFOHP) will be carried out to reveal the intrinsic relationship bwteen key parameters and geometric parameters. And theoretical models of heat transport capability will be established. The research results of this project will contribute to a better understanding on flow and heat transfer mechanism of the self-rewetting fluid, and provide new avenues for the further development of highly efficient heat pipe cooling technology.

随着微电子领域的高速发展，电子元件的热管理已成为一个亟需解决的重要问题。热管技术因其高效换热能力成为解决电子散热问题的有效途径，而自湿润流体作为新型工质,因具有自发润湿高温烧干区域的特性，起到强化传热的效果而引起广泛关注。本项目针对自湿润流体的流动与传热机理，从宏观现象到微观物理本质进行系统的研究。通过可视化实验,深入研究自湿润流体的沸腾特性和管内Marangoni流动现象，明晰自湿润流体的流动和传热机理；利用分子动力学理论研究自湿润流体的有效导热系数及流体组分间的相容性；最后对基于自湿润流体的振荡热管传热特性进行实验研究，弄清各参数对其性能的影响，建立其热输送能力的理论预测模型。本项目的研究成果将有助于更好地弄清自湿润流体的流动和传热机理，为进一步开发新型高效热管散热技术提供新的理论与方法。

本项目针对自湿润流体的流动与传热机理，从基本物性出发，明确自湿润流体在流动和传热特性上的物理本质特性。利用可视化实验，搭建池沸腾实验台，深入研究自湿润流体起泡现象和管内Marangoni流动现象，明晰自湿润流体的流动和传热机理。利用分子动力学理论，初步研究了自湿润流体的有效导热系数及流体组分间的相容性。另外，针对自湿润流体的应用研究，制备了基于自湿润流体工质的振荡热管传热特性，并进行实验研究，揭示了热管的关键参数（启动温度、最大热输送量）与几何参数（管径、弯头数、热输送距离等）之间的内在关系，同时的构建了一套基于FLUENT中UDF的理论预测模型，能够较为准确地预测其热输送能力。在研期间，本项目发表SCI论文12篇，研究成果有助于更好地弄清自湿润流体的流动和传热机理，为进一步开发新型高效热管散热技术提供方法与指导。