Measurement of frictional drag force on superhydrophobic metallic surface
Loading...
Authors
Ley, J.R.
Kwon, Y.W.
Masellas, D.
Subjects
Superhydrophobic
Skin frictional force
Femtosecond laser
Drag reduction
Skin frictional force
Femtosecond laser
Drag reduction
Advisors
Date of Issue
2018-06-08
Date
8 June 2018
Publisher
SpringerLink
Language
Abstract
Material surfaces can be modified to become superhydrophobic using different techniques. Test equipment is necessary to assess the effectiveness of a superhydrophobic surface against frictional drag force. Because the frictional drag force is very small, especially for a sample size to be tested at a laboratory level, a traditional water channel system is not suitable. As a result, a new test setup was designed and fabricated to measure the reduction in the skin frictional drag force on such a superhydrophobic metallic surface. Two different types of sensors were considered. The first one was a spring-based displacement sensor and the other was a spring-less displacement sensor. The developed test setup can have the flow speed with a range of Reynolds numbers up to 70,000 with respect to the test specimen. In this range, the change in the frictional drag force was measured for superhydrophobic surfaces. A microscope was also used to check any change in the air film on the superhydrophobic surface as the flow speed was increased.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1007/s41939-018-0019-7
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Ms. Sarwat Chappell at the Office of Naval Research
Funder
Format
8 p.
Citation
Ley, J. R., Y. W. Kwon, and D. Masellas. "Measurement of frictional drag force on superhydrophobic metallic surface." Multiscale and Multidisciplinary Modeling, Experiments and Design (2018): 1-8.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.