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Flow Physics of Wicking into Woven Screens with Hybrid Micro-/Nanoporous Structures
Langmuir ( IF 3.7 ) Pub Date : 2021-02-11 , DOI: 10.1021/acs.langmuir.0c02872 Ye Wang 1 , Yilin Lin 1 , Guang Yang 1 , Jingyi Wu 1
Langmuir ( IF 3.7 ) Pub Date : 2021-02-11 , DOI: 10.1021/acs.langmuir.0c02872 Ye Wang 1 , Yilin Lin 1 , Guang Yang 1 , Jingyi Wu 1
Affiliation
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Wicking within woven screens has attracted considerable attention due to its important role in applications concerning phase-change heat transfer and phase separation. In the present study, horizontal spreading experiments are conducted to investigate the wicking performance of woven screens by measuring the volumetric liquid intake into the screens and the liquid propagation fronts through two perpendicular high-speed cameras. Woven screens with micro (single- and multilayer)- and nano (plain, etched, and fluoridated)-porous structures are manipulated through diffusion bonding and chemical processes. The macroscopic observation indicates the substantial enhancement of the wicking capability in multilayer structures, where the interlayer microchannels could compensate for the essential deficiency of single-layer screens by providing low-resistance flow passages. Wicking capability of water is enhanced by the hydrophilic nanograsses along the wires. Furthermore, flow mechanisms within the screens are analyzed by comparisons between apparent and saturated wicking distances. In multilayer structures, the liquid spreads along the entire cross-sectional area in etched screens, while it spreads primarily along the interlayer microchannels in plain and fluoridated screens. The influence of various fluids on the wicking behavior within the woven screens is found to be fully represented by a unique parameter that captures the effects of surface tension and dynamic viscosity in the radial flow model. This work deepens the understanding of the capillary-driven flow within the woven screens with hybrid micro-/nanoporous structures and provides guidance for the design and manufacture of highly efficient wicking structures.
中文翻译：
混合微孔/纳孔结构的筛网芯吸流动物理
由于其在相变传热和相分离的应用中的重要作用，因此在编织筛网中的芯吸已引起相当大的关注。在本研究中，通过测量两个筛网中的液体摄入量和通过两个垂直高速摄像头的液体传播前沿，进行了水平铺展实验，以研究编织筛网的芯吸性能。具有微（单层和多层）和纳米（纯，蚀刻和氟化）多孔结构的编织筛网可通过扩散键合和化学工艺进行处理。宏观观察表明，多层结构的芯吸能力大大增强，层间微通道可以通过提供低阻力的流道来弥补单层滤网的本质缺陷。沿金属丝的亲水性纳米草增强了水的芯吸能力。此外，通过比较视在和饱和芯吸距离来分析筛网内的流动机理。在多层结构中，液体在蚀刻的筛网中沿整个横截面面积扩散，而液体则主要在普通和氟化筛网中沿层间微通道扩散。发现各种流体对机织滤网内芯吸行为的影响完全由一个独特的参数表示，该参数在径向流模型中捕获了表面张力和动态粘度的影响。
更新日期：2021-02-23
中文翻译：
混合微孔/纳孔结构的筛网芯吸流动物理
由于其在相变传热和相分离的应用中的重要作用，因此在编织筛网中的芯吸已引起相当大的关注。在本研究中，通过测量两个筛网中的液体摄入量和通过两个垂直高速摄像头的液体传播前沿，进行了水平铺展实验，以研究编织筛网的芯吸性能。具有微（单层和多层）和纳米（纯，蚀刻和氟化）多孔结构的编织筛网可通过扩散键合和化学工艺进行处理。宏观观察表明，多层结构的芯吸能力大大增强，层间微通道可以通过提供低阻力的流道来弥补单层滤网的本质缺陷。沿金属丝的亲水性纳米草增强了水的芯吸能力。此外，通过比较视在和饱和芯吸距离来分析筛网内的流动机理。在多层结构中，液体在蚀刻的筛网中沿整个横截面面积扩散，而液体则主要在普通和氟化筛网中沿层间微通道扩散。发现各种流体对机织滤网内芯吸行为的影响完全由一个独特的参数表示，该参数在径向流模型中捕获了表面张力和动态粘度的影响。
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