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

利用具有良好微结构的分层多孔结构研究核沸腾现象相变换热一直是一个具有重大科学和技术意义的课题，因为它可以作为一种高效的冷却方法应用于高热流密度应用。核态沸腾是最有效的换热方式之一，它受受热面上气泡生长和脱离的复杂过程控制。织构表面和多孔材料通常被用来增强表面积的换热和气泡成核动力学。为了在技术实践中更有效地利用成核沸腾，必须更好地了解气泡在纹理表面和多孔材料上的成核和脱离的动力学。这类研究将提供融合热传输物理、纳米工程和材料科学的多学科培训机会。从这项研究中获得的见解将使热管理至关重要的广泛技术取得进展，包括高功率密度电子设备、数据服务器和电子战。拟议的研究将寻求设计分层多孔的金属结构来设计成核沸腾换热。为此，这项研究将利用一种新的三维(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尺寸(从纳米到几十微米)。具有良好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的大小、频率和成核沸腾现象。同时的参数计算研究和沸腾和润湿试验的初步结果将有助于促进对多孔介质中热传输机理的基本理解。

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.