Abstract
Drag reduction of pipe flow using flexible tubes was experimentally examined with respect to the displacement fluctuation characteristics, by means of a noncontact-type measuring instrument. The results show that the thinner the flexible tube and the larger the Reynolds number, the larger is the energy of the power spectrum distribution of the fluctuating displacement. Therefore, these phenomena have negative correlations with those of the fluctuating pressure mentioned in the previous paper. In the case of the thinnest flexible tube measured newly in the present paper, this tendency, which is the reason for drag reduction, is the same for the higher frequency of the fluctuating pressure. On the other hand, the band energy having the lower frequency of fluctuating pressure is the reason for drag increase.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
