Copper capillaries with lubricant-infused walls: fabrication and drag reduction performance
Copper capillaries with lubricant-infused walls: fabrication and drag reduction performance
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DOI：
10.1007/s10404-022-02581-9
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发表时间：
2022-09
影响因子：
2.8
通讯作者：
Huilong Yan;Fang Qian;Kai Jiao;Wenyao Zhang;Zhoutuo Tan;Lingru Zhao;Qiuwan Wang;Cunlu Zhao
中科院分区：
文献类型：
--
作者：
Huilong Yan;Fang Qian;Kai Jiao;Wenyao Zhang;Zhoutuo Tan;Lingru Zhao;Qiuwan Wang;Cunlu Zhao
润滑剂注入表面（LIS）已成为一个有前途的减阻表面的流动增强。目前，利斯在聚合物基微通道减阻方面有一些应用。然而，缺乏在金属毛细管或微通道中使用LIS来减少阻力或增强流动。本工作提出了一种方法，用于制造的LIS的内表面上的铜（Cu）毛细管，以赋予他们可持续的减阻性能。还制备了具有内部超疏水表面（SHS）（接触角> 160°）的Cu毛细管作为比较的参考。为了测试在不同的工作条件下的流体动力学性能，我们制作了LIS铜毛细管与不同粘度的润滑剂，和它们的摩擦系数进行了实验测量，雷诺数（Re）范围从0到1500。LIS铜毛细管的减阻率（32%）略低于SHS铜毛细管的减阻率（36%），但LIS铜毛细管具有更好的可持续性。启动LIS铜毛细管的故障的阈值Re几乎是SHS铜毛细管的三倍，并且LIS铜毛细管在高剪切力条件下的耐久性也高得多。LIS Cu毛细管的上级可持续性是由于应用于LIS的复合形态和官能团引起的增强的毛细管力和货车范德华力（vdW）。本研究将提供有益的见解，设计强大的和可持续的利斯的铜毛细管中的减阻或流动增强。
The lubricant-infused surface (LIS) has emerged as a promising drag reduction surface for flow enhancement. At present, there are some applications of LISs in polymer-based microchannels for drag reduction. However, the use of the LIS in metal capillaries or microchannels for drag reduction or flow enhancement is lacking. The present work proposes a method for the fabrication of a LIS on the inner surface of copper (Cu) capillaries to grant them sustainable drag reduction properties. Cu capillaries with an inner superhydrophobic surface (SHS) (contact angle > 160°) are also prepared as a reference for comparison. To test the hydrodynamic performance under different working conditions, we fabricated LIS Cu capillaries with lubricants of varying viscosities, and their frictional factors were experimentally measured with a Reynolds number (Re) ranging from 0 to 1500. The drag reduction of the LIS Cu capillary (32%) is slightly lower than that of the SHS Cu capillary (36%), but the LIS Cu capillary has much better sustainability. The threshold Re for initiating the failure of LIS Cu capillaries is almost three times that of the SHS Cu capillary, and the durability of the LIS Cu capillary under high shear force conditions is also much higher. The superior sustainability of the LIS Cu capillaries is due to the enhanced capillary and Van der Waals (vdW) forces caused by the composite morphology and functional groups applied to the LIS. The present study will provide useful insights for designing robust and sustainable LISs for drag reduction or flow enhancement in Cu capillaries.