Copper capillaries with lubricant-infused walls: fabrication and drag reduction performance

Microfluidics and Nanofluidics - Tập 26 - Trang 1-11 - 2022
Huilong Yan1,2, Fang Qian1, Kai Jiao1, Wenyao Zhang1,3, Zhoutuo Tan1, Lingru Zhao4, Qiuwang Wang1, Cunlu Zhao1,2
1MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, China
2MOE Key Laboratory for Thermal Science and Power Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing, China
3School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
4Department of Chemistry, School of Science, Xi’an Jiaotong University, Xi’an, China

Tóm tắt

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.

Tài liệu tham khảo

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Microfluidics and Nanofluidics

Tập 26

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