EAGER: Investigation of Nucleate Boiling Phenomena using Hierarchically Porous Constructs with Well-Defined Microstructure

相变传热作为一种高热流密度应用的有效冷却方法，已成为一个重要的科学和技术研究课题。核态沸腾是一种有效的传热方式，它是由气泡在受热面上生长和离开受热面的复杂过程控制的。纹理化表面和多孔材料已被普遍用于提高传热和气泡成核动力学的表面积。为了更有效地利用核态沸腾在工艺实践中，它是必要的，以更好地了解气泡的成核和离开织构表面和多孔材料的动力学。这些研究将提供多学科的培训机会，融合热传输物理，纳米工程和材料科学。从这样的研究中获得的见解将使在广泛的技术，其中热管理是至关重要的，包括高功率密度的电子设备，数据服务器和电子warfare.The拟议的研究将寻求设计层次多孔金属结构工程师核沸腾传热的进步。为此，本研究将利用一类新的三维（3D）分层多孔金属结构，使用最近开发的软物质模板方法，独立控制两个尺度的孔径（从纳米到几十微米）。具有明确多孔结构的材料系统将有助于研究分级孔分布如何影响气泡尺寸、频率和核沸腾现象。同时参数计算研究和沸腾和润湿试验的初步结果将有助于推进通过多孔介质的热传输机制的基本理解。

Investigation of Nucleate Boiling Phenomena using Hierarchically Porous Constructs with Well-Defined Microstructure Phase change heat transfer has been a topic of significant scientific and technological interest as it can serve as an efficient cooling method for high heat flux applications. Nucleate boiling is one of the most effective heat transfer mode, which is governed by a complex process of bubble growth on, and departure from, heating surfaces. Textured surfaces and porous materials have been commonly used to enhance the surface area for heat transfer and the bubble nucleation kinetics. To more effectively utilize nucleate boiling in technological practice, it is essential to better understand the dynamics of bubble nucleation and departure on textured surfaces and porous materials. Such studies will provide multi-disciplinary training opportunities that merge thermal transport physics, nanoengineering, and materials science. The insights gained from such a study would enable advances in a wide range of technologies in which thermal management is critical, including high-power-density electronic devices, data servers, and electronic warfare.The proposed study will seek to design hierarchically porous metallic constructs to engineer nucleate boiling heat transfer. To this end, this study will utilize a new class of three-dimensional (3D) hierarchically porous metallic structures using a recently developed soft matter templating method with independent control over two scales of pore sizes (from nano- to tens of micrometers). The materials system with well-defined porous structure will help to investigate how hierarchical pore distribution affects bubble size, frequency and nucleate boiling phenomena. Simultaneous parametric computational studies and preliminary results from boiling and wetting tests will help to advance fundamental understandings of thermal transport mechanism through porous media.