ldv measurement
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LDV Measurement of Turbulent Pipe Flow With Traveling Wavy Elastic Wall for Drag Reduction

2019 ◽  
Author(s):  
Seiya Nakazawa ◽  
Takaaki Shimura ◽  
Akihiko Mitsuishi ◽  
Kaoru Iwamoto ◽  
Akira Murata
Keyword(s):  
Drag Reduction ◽  
Pipe Flow ◽  
Reduction Rate ◽  
Streamwise Velocity ◽  
Turbulent Pipe Flow ◽  
Deformation Control ◽  
Wall Deformation ◽  
Maximum Drag Reduction ◽  
Reduction Effect ◽  
Ldv Measurement

Abstract Drag reduction effect by traveling wavy wall deformation control in turbulent pipe flow was experimentally investigated. From the visualization, we confirmed the downstream traveling wave although it was not uniform in the circumferential direction. When the frequency is 110 Hz, the wall deformation amplitude and the wavelength indicated that the effective values for drag reduction. The wavespeed is approximately effective values for drag reduction. As a result, the maximum drag reduction rate of 6.8 % is obtained. The result of a LDV measurement shows that the mean streamwise velocity gradient decreased near the wall by the control, which leads to drag reduction.

LDV measurement of the velocity amplitude of the traveling-wave thermoacoustic engine with liquid piston and phase change

2017 ◽  
Vol 2017.20 (0) ◽  
pp. C05
Author(s):  
Ryunosuke HASEGAWA ◽  
Yosuke OGAWA ◽  
Fumihito SUGAWARA ◽  
Mariko SENGA ◽  
Kazuto KUZUU ◽  
...  
Keyword(s):  
Phase Change ◽  
Traveling Wave ◽  
Thermoacoustic Engine ◽  
Velocity Amplitude ◽  
Liquid Piston ◽  
Ldv Measurement

scholarly journals LDV measurement of bird ear vibrations to determine inner ear impedance and middle ear power flow

2016 ◽  
Author(s):  
Pieter G. G. Muyshondt ◽  
Felipe Pires ◽  
Joris J. J. Dirckx
Keyword(s):  
Inner Ear ◽  
Middle Ear ◽  
Power Flow ◽  
Ldv Measurement

LDV measurement of the velocity amplitude in the traveling wave thermoacoustic engine with liquid-vapor phase change

2016 ◽  
Vol 2016 (0) ◽  
pp. D232
Author(s):  
Yosuke OGAWA ◽  
Mariko SENGA ◽  
Ryunosuke HASEGAWA ◽  
Kazuto KUZUU ◽  
Shinya HASEGAWA ◽  
...  
Keyword(s):  
Phase Change ◽  
Vapor Phase ◽  
Traveling Wave ◽  
Thermoacoustic Engine ◽  
Velocity Amplitude ◽  
Ldv Measurement ◽  
Liquid Vapor
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