TY - GEN
T1 - Skin-Friction Drag Reduction Using Micro-Grate Patterned Superhydrophobic Surface
AU - Bingfu, Zhang
AU - Hui, Tang
AU - Sandy, To
N1 - Publisher Copyright:
© 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
PY - 2021
Y1 - 2021
N2 - This study investigates experimentally the drag reduction of the micro-grate patterned superhydrophobic (SHPO) surface compared with its smooth flat counterpart in turbulent boundary layer flow. Two SHPO surfaces were examined, with the same air fraction but different grate spacings. Both surfaces were fabricated using ultra-precision machining techniques. A dedicated, high resolution skin-friction balance was developed to measure the drag reduction in a water tunnel at the Reynolds number Reτ, based on the friction velocity uτ, of about 500. Significant drag reductions of 41% and 34% were obtained by the two surfaces. It is found that neither the air fraction or the static contact angle can predict the reduction in drag. Further, we show that the shape of the gas–liquid interface between grates may have a pronounced effect on the drag reduction.
AB - This study investigates experimentally the drag reduction of the micro-grate patterned superhydrophobic (SHPO) surface compared with its smooth flat counterpart in turbulent boundary layer flow. Two SHPO surfaces were examined, with the same air fraction but different grate spacings. Both surfaces were fabricated using ultra-precision machining techniques. A dedicated, high resolution skin-friction balance was developed to measure the drag reduction in a water tunnel at the Reynolds number Reτ, based on the friction velocity uτ, of about 500. Significant drag reductions of 41% and 34% were obtained by the two surfaces. It is found that neither the air fraction or the static contact angle can predict the reduction in drag. Further, we show that the shape of the gas–liquid interface between grates may have a pronounced effect on the drag reduction.
KW - Drag reduction
KW - High-resolution skin-friction balance
KW - Superhydrophobic surface
UR - https://www.scopus.com/pages/publications/85106421890
U2 - 10.1007/978-981-33-4960-5_15
DO - 10.1007/978-981-33-4960-5_15
M3 - 会议稿件
AN - SCOPUS:85106421890
SN - 9789813349599
T3 - Lecture Notes in Mechanical Engineering
SP - 95
EP - 100
BT - Fluid-Structure-Sound Interactions and Control - Proceedings of the 5th Symposium on Fluid-Structure-Sound Interactions and Control
A2 - Braza, Marianna
A2 - Hoarau, Yannick
A2 - Zhou, Yu
A2 - Lucey, Anthony D.
A2 - Huang, Lixi
A2 - Stavroulakis, Georgios E.
PB - Springer Science and Business Media Deutschland GmbH
T2 - 5th Symposium on Fluid-Structure-Sound Interactions and Control, FSSIC 2019
Y2 - 27 August 2019 through 30 August 2019
ER -