Investigation of drag-reduction effect of super-hydrophilic surface in laminar microchannel flow
In previous studies of newly fabricated surface-coating materials, the super hydrophilic surface etched by Cu2+/HNO3 exerts higher drag-reduction effect at low Reynolds numbers than the modified superhydrophobic surface even with similar surface structure. In this paper, both experimental and modell...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Conference Paper |
| Language: | English |
| Published: |
2022
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| Online Access: | https://hdl.handle.net/10356/158448 |
| _version_ | 1826114883339419648 |
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| author | Luo, Haoyu Lu, Lichang Hao, Yu Li, Xiang Dong, Zhili Liu, Yang Li, Yuanzhe |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Luo, Haoyu Lu, Lichang Hao, Yu Li, Xiang Dong, Zhili Liu, Yang Li, Yuanzhe |
| author_sort | Luo, Haoyu |
| collection | NTU |
| description | In previous studies of newly fabricated surface-coating materials, the super hydrophilic surface etched by Cu2+/HNO3 exerts higher drag-reduction effect at low Reynolds numbers than the modified superhydrophobic surface even with similar surface structure. In this paper, both experimental and modelling fluid dynamics studies are used to invest the drag-reduction and flow field for these super hydrophilic surfaces in the microchannel. The experimental results showed that the drag-reduction rate would gradually decrease with the velocity increment of medium. Besides, the dissolved gas does play a key role in reducing the shear stress in the near wall flow field by forming the non-shear air/water interface and increasing its wall-slippage effect. Moreover, the flow-field stimulation analysis provides more intuitive schematic diagram velocity magnitude and pressure changes inside the microchannel, and the surface roughness obtained by chemical etching is capable to enhance the drag-reduction effect as well. |
| first_indexed | 2024-10-01T03:46:28Z |
| format | Conference Paper |
| id | ntu-10356/158448 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:46:28Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1584482023-07-08T05:40:56Z Investigation of drag-reduction effect of super-hydrophilic surface in laminar microchannel flow Luo, Haoyu Lu, Lichang Hao, Yu Li, Xiang Dong, Zhili Liu, Yang Li, Yuanzhe School of Materials Science and Engineering 6th International Conference on Energy Science and Applied Technology Engineering::Materials Super Hydrophilic Chemical Etching Drag Reduction Microchannel Flow Mechanism Analysis In previous studies of newly fabricated surface-coating materials, the super hydrophilic surface etched by Cu2+/HNO3 exerts higher drag-reduction effect at low Reynolds numbers than the modified superhydrophobic surface even with similar surface structure. In this paper, both experimental and modelling fluid dynamics studies are used to invest the drag-reduction and flow field for these super hydrophilic surfaces in the microchannel. The experimental results showed that the drag-reduction rate would gradually decrease with the velocity increment of medium. Besides, the dissolved gas does play a key role in reducing the shear stress in the near wall flow field by forming the non-shear air/water interface and increasing its wall-slippage effect. Moreover, the flow-field stimulation analysis provides more intuitive schematic diagram velocity magnitude and pressure changes inside the microchannel, and the surface roughness obtained by chemical etching is capable to enhance the drag-reduction effect as well. Published version This work was supported by the National Natural Science Foundation of China (grant number 51704258); the research foundation of Zhuzhou Smelter Group Co (grant number ZYKJ20190422002); and the Natural science foundation of Hunan Province, China (grant number 2019JJ50587). 2022-05-25T04:54:15Z 2022-05-25T04:54:15Z 2021 Conference Paper Luo, H., Lu, L., Hao, Y., Li, X., Dong, Z., Liu, Y. & Li, Y. (2021). Investigation of drag-reduction effect of super-hydrophilic surface in laminar microchannel flow. 6th International Conference on Energy Science and Applied Technology, 804, 022037-. https://dx.doi.org/10.1088/1755-1315/804/2/022037 https://hdl.handle.net/10356/158448 10.1088/1755-1315/804/2/022037 2-s2.0-85110911405 804 022037 en © 2021 The Author(s). Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd. application/pdf |
| spellingShingle | Engineering::Materials Super Hydrophilic Chemical Etching Drag Reduction Microchannel Flow Mechanism Analysis Luo, Haoyu Lu, Lichang Hao, Yu Li, Xiang Dong, Zhili Liu, Yang Li, Yuanzhe Investigation of drag-reduction effect of super-hydrophilic surface in laminar microchannel flow |
| title | Investigation of drag-reduction effect of super-hydrophilic surface in laminar microchannel flow |
| title_full | Investigation of drag-reduction effect of super-hydrophilic surface in laminar microchannel flow |
| title_fullStr | Investigation of drag-reduction effect of super-hydrophilic surface in laminar microchannel flow |
| title_full_unstemmed | Investigation of drag-reduction effect of super-hydrophilic surface in laminar microchannel flow |
| title_short | Investigation of drag-reduction effect of super-hydrophilic surface in laminar microchannel flow |
| title_sort | investigation of drag reduction effect of super hydrophilic surface in laminar microchannel flow |
| topic | Engineering::Materials Super Hydrophilic Chemical Etching Drag Reduction Microchannel Flow Mechanism Analysis |
| url | https://hdl.handle.net/10356/158448 |
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