Hydraulic friction reduction in a microchannel due to superhydrophobic texturing of its walls was studied theoretically and experimentally. A modified Poiseuille equation formulated from an earlier-established semi-analytical approach to model texturing of slip lengths and the “gas cushion model” was used to predict the hydraulic conductance of a microchannel. An experimental setup with a microfluidic flow cell consisting of syringe pump, pressure manometer and tubing measured the pressure drop at different flow rates through a microchannel. The top and bottom walls of the microchannel was textured with micro-pits using nanosecond pulsed laser on the titanium alloy Ti6Al4V. A very high contact angle was observed on the textured surfaces suggesting entrapped gas bubbles. Liquid slippage leading to reduced hydraulic friction is attributable to the bubbles. The pressure-flow rate characteristics of the microchannels confirm friction reduction and also demonstrate a reasonable agreement with the theoretical predictions from the developed fluid dynamic model.
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ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels
June 10–13, 2018
Dubrovnik, Croatia
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5119-7
PROCEEDINGS PAPER
Reduction of Hydraulic Friction in Confined Flows by Laser Texturing: Experiments and Theoretical Validation
Avinash Kumar,
Avinash Kumar
Indian Institute of Technology Delhi, New Delhi, India
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Subhra Datta,
Subhra Datta
Indian Institute of Technology Delhi, New Delhi, India
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Dinesh Kalyanasundaram
Dinesh Kalyanasundaram
Indian Institute of Technology Delhi, New Delhi, India
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Avinash Kumar
Indian Institute of Technology Delhi, New Delhi, India
Subhra Datta
Indian Institute of Technology Delhi, New Delhi, India
Dinesh Kalyanasundaram
Indian Institute of Technology Delhi, New Delhi, India
Paper No:
ICNMM2018-7740, V001T06A007; 9 pages
Published Online:
August 23, 2018
Citation
Kumar, A, Datta, S, & Kalyanasundaram, D. "Reduction of Hydraulic Friction in Confined Flows by Laser Texturing: Experiments and Theoretical Validation." Proceedings of the ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels. Dubrovnik, Croatia. June 10–13, 2018. V001T06A007. ASME. https://doi.org/10.1115/ICNMM2018-7740
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