scholarly journals Effect of Fixed Separation Points on Wake Oscillation and Surface Character in Suppression of the Karman Vortex Street due to Positive Buoyancy from a Cylinder.

2000 ◽  
Vol 66 (645) ◽  
pp. 1479-1486
Author(s):  
Katsuhisa NOTO ◽  
Kyosuke FUJIMOTO ◽  
Tsuyoshi NAKAJIMA
Keyword(s):  
Vortex Street ◽  
Karman Vortex Street ◽  
Surface Character ◽  
Kármán Vortex Street ◽  
Karman Vortex ◽  
Wake Oscillation

scholarly journals von Kármán Vortex Street within an Impacting Drop

2012 ◽  
Vol 108 (26) ◽  
Author(s):  
Marie-Jean Thoraval ◽  
Kohsei Takehara ◽  
Takeharu Goji Etoh ◽  
Stéphane Popinet ◽  
Pascal Ray ◽  
...  
Keyword(s):  
Vortex Street ◽  
Karman Vortex Street ◽  
Von Karman ◽  
Von Karman Vortex Street ◽  
Kármán Vortex Street ◽  
Karman Vortex ◽  
Von Kármán

Use of Laser Doppler Vibrometry for Measuring Flow-Induced Vibration of a Thermowell in a Pipe Flow

2021 ◽  
Author(s):  
Sejong Chun ◽  
Sibok Lee ◽  
Hyewon Yoon
Keyword(s):  
Strain Rate ◽  
Laser Doppler ◽  
Vortex Street ◽  
Rate Measurement ◽  
Flow Induced Vibration ◽  
Laser Doppler Vibrometry ◽  
Karman Vortex Street ◽  
Kármán Vortex Street ◽  
Karman Vortex ◽  
Strain Rate Measurement

Abstract Thermowells with helical strakes are becoming promising to prevent them from fatigue fracture by Kármán vortex street. Many studies suggest various kinds of measurement techniques, including strain rate measurement, acceleration measurement, and high-speed visualization to evaluate the role of Kármán vortex street to the flow-induced vibration. Nevertheless, use of laser Doppler vibrometry has not yet been reported in the literature. This study compared the tip deflection of a thermowell due to the flow-induced vibration by using the laser Doppler vibrometry and the strain rate measurement. The laser Doppler vibrometry could measure the tip deflection directly. On the other hand, the strain rate measurement had to convert the strain rate into the tip deflection through the Euler-Bernoulli beam theory. Measurement equivalence between the laser Doppler vibrometry and the strain rate measurement was discussed with the results of tip deflections of the thermowell.

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