Advances in Fluid and Thermal Transport Property Analysis and Design of Sintered Porous Wick Microstructures
Advances in Fluid and Thermal Transport Property Analysis and Design of Sintered Porous Wick Microstructures
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DOI：
10.1115/1.4023569
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发表时间：
2013-06-01
影响因子：
--
通讯作者：
Garimella, Suresh V.
中科院分区：
文献类型：
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作者：
Bodla, Karthik K.;Weibel, Justin A.;Garimella, Suresh V.
烧结多孔结构作为热管理和其他应用的热传输介质是普遍存在的。特别地，低孔隙率烧结填充床被用作热管中的毛细芯吸和蒸发增强结构。准确预测和分析不同微结构的输运特性对于改进设计是重要的。由于这些材料的随机性和几何复杂性，预测方法的发展一直是广泛的先前研究的主题。本工作总结并建立在此类非均质介质中流体和热传输孔隙尺度模型的过去研究和最新进展的基础上。简要回顾了各种分析和数值模型的简化预测的传输特性，如有效的导热系数，渗透率，和界面传热。最近，人们对多孔介质几何形状的真实表示中的直接数值模拟运输越来越感兴趣;例如，通过采用无损3D成像技术，如X射线显微断层扫描。确定了未来的研究方向，期待超越技术的材料表征单独，并专注于那些通过建模的物理烧结制造过程中的芯结构的逆向工程。这种方法最终可用于设计复杂的烧结多孔结构，具有针对特定应用定制的所需特性。
Sintered porous structures are ubiquitous as heat transport media for thermal management and other applications. In particular, low-porosity sintered packed beds are used as capillary-wicking and evaporation-enhancement structures in heat pipes. Accurate prediction and analysis of their transport characteristics for different microstructure geometries is important for improved design. Owing to the random nature and geometric complexity of these materials, development of predictive methods has been the subject of extensive prior research. The present work summarizes and builds upon past studies and recent advances in pore-scale modeling of fluid and thermal transport within such heterogeneous media. A brief review of various analytical and numerical models for simplified prediction of transport characteristics such as effective thermal conductivity, permeability, and interfacial heat transfer is presented. More recently, there has been a growing interest in direct numerical simulation of transport in realistic representations of the porous medium geometry; for example, by employing nondestructive 3D imaging techniques such as X-ray microtomography. Future research directions are identified, looking beyond techniques intended for material characterization alone, and focusing on those targeting the reverse engineering of wick structures via modeling of the physical sintering fabrication processes. This approach may eventually be employed to design intricate sintered porous structures with desired properties tailored to specific applications.