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Physics of Fluids : Circulation and energy of the leading vortex ring in a gravity-driven starting jet

By L. Gao, S. C. M. Yu, J. J. Ai, and A. W. K. Law

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Book Id: WPLBN0002169597
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 10 September 2008

Title: Physics of Fluids : Circulation and energy of the leading vortex ring in a gravity-driven starting jet  
Author: L. Gao, S. C. M. Yu, J. J. Ai, and A. W. K. Law
Volume: Issue : September 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Physics of Fluids Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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S. C. M. Yu, J. J. Ai, And A. W. K. La, L. G. (n.d.). Physics of Fluids : Circulation and energy of the leading vortex ring in a gravity-driven starting jet. Retrieved from http://community.ebooklibrary.org/


Description
Description: The gravity-driven starting jet characteristics over the range of Reynolds numbers from 1179 to 10 611 have been investigated using planar laser induced fluorescence and particle image velocimetry. Of the 17 cases investigated, pinch off for the leading vortex was found to appear at Reynolds number above 3000. For those cases involving pinch off, limiting values for the nondimensional circulation for the leading vortex could be identified at around 1.26 and the nondimensional energy was at about 0.35±0.01, respectively. The former agrees with the universal value proposed by Shusser et al. [Phys. Fluids 18, 033601 (2006) ] to within 9%, while the latter lies within the analytical result range (from 0.27 to 0.4) proposed by Gharib et al. [J. Fluid Mech. 360, 121 (1998) ]. The results thus suggested that the pinched-off vortex ring would achieve similar characteristics and that may also be independent of the generation mechanism.

 

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