新型冷板毛细薄液膜传热传质机理及其流体多尺度输运特性

超长续航里程和极短充电时间发展需求，动力电池超高热流密度热管理问题将成为制约下一代新能源汽车发展的关键技术瓶颈。本项目以新型高效冷板为研究对象，提出采用超亲水微针肋实现最大化薄液膜的高效利用而强化传热的新方法，以形成新型冷板的优化设计理论为目标，围绕强毛细微针肋诱导薄液膜拓扑演变特征及强化传热传质机理、高效传热低阻新型冷板解耦机制两个关键科学问题，通过理论分析、实验研究和数值模拟，探索毛细薄液膜拓扑形貌与传热特性，阐明强毛细力最大化微针肋薄液膜区域及其表面凹凸曲率强化蒸气扩散耦合下传热传质强化机理，建立多域结构分形歧管流体输运理论模型，探索分形歧管流体多尺度输运动力学特性，研究制冷剂R1234yf和R134a在冷板内沸腾传热性能，揭示新型冷板实现低阻和高传热性能解耦机制。本项目研究成果为新型冷板在下一代新能源汽车动力电池热管理系统的高效、安全应用提供基础理论，具有重要的科学意义和应用价值。

The development needs of long range cruising and short charging time, battery thermal management with ultra-high heat flux will become the critical bottleneck for the continuous development of next-generation electric vehicles. Taking the novel high-efficiency cold plate as research objects, this project is proposed to develop superhydrophobic micro-pin-fin to maximize thin liquid film utilization and thus heat transfer can be enhanced, aims to develop the optimal design theory of novel high-efficiency cold plate, and focus on two key science problems: the topological characteristics and heat-mass transfer enhancement mechanism of thin liquid film in capillary micro-pin-fin, the decoupling mechanism of novel cold plate with high efficient heat transfer and low flow resistance. By means of synergistically combining theoretical analysis, experimental study and numerical simulation, the research contents in the project include: investigation of the topological morphology and heat transfer characteristics of capillary-driven thin liquid film, which will reveal the couple role of maximum the thin liquid film area induced by capillary force and enhanced vapor-phase diffusion on the heat and mass transfer enhancement mechanism of micro-pin-fin; development of a fractal theoretical model of fluid transport in a multi-domain structure and exploration of the kinetic characteristics of multiscale fluid transport; investigation of boiling heat transfer of R1234yf and R134a in novel cold plate and clarification of the heat transfer enhancement mechanism of cold plate by decoupling the low flow resistance and high heat transfer performance. The achievements from this project will provide a theoretical basis for novel high efficiency cold plate to be high efficiently and safely application in the battery thermal management system of next-generation electric vehicles, and is bound to be of great values from the academic and practical application viewpoints.