On the self-excited vibrations of bluff bodies suspended with a narrow clearance in a vertical pipe

Autor:	V. P. Karlikov, N. T. Reznichenko, G. I. Sholomovich
Rok vydání:	2000
Předmět:	Fluid Flow and Transfer Processes Flow visualization Piping Materials science Water flow Mechanical Engineering education Flow (psychology) General Physics and Astronomy Reynolds number Mechanics Lateral movement Physics::Fluid Dynamics Vibration symbols.namesake symbols Strouhal number
Zdroj:	Fluid Dynamics. 35:268-273
ISSN:	1573-8507 0015-4628
DOI:	10.1007/bf02831435
Popis:	The results of an experimental study of the flow past a sphere suspended with a narrow clearance in a circular cylindrical pipe and allowed only lateral movement, are presented. The study was limited to the case of intense vibrations accompanied by impacts between the sphere and the pipe wall. The experiments were conducted in steel and copper pipes at Reynolds numbers varying from 104 to 105 and several values of the sphere mass and the clearance between the sphere and the pipe wall. The self-excited vibration frequency was measured by a newly developed method based on registering the frequency only in the resonance modes which set in when the sphere and pipe vibration eigenfrequencies coincide. The flow was photographed and filmed at various values of the water flow rate. The major nondimensional parameters characterizing the phenomenon considered were revealed, and a universal relation between them and the nondimensional self-excited vibration frequency was established with acceptable accuracy.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f08b80573e5a171870bfc77866ce36f2 https://doi.org/10.1007/bf02831435 Zobrazit plný text záznamu Full text from SpringerLink