PIV study on the interaction of triple transitional round fountains in a homogeneous fluid

Mahmud, H., Hill, B., Gao, W., Lin, W., He, Y., and Armfield, S.W. (2012) PIV study on the interaction of triple transitional round fountains in a homogeneous fluid. In: Proceedings of the 18th Australasian Fluid Mechanics Conference, pp. 1-4. From: 18th Australasian Fluid Mechanics Conference, 3-7 December 2012, Launceston, Tasmania, Australia.

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Abstract

This paper investigates experimentally the transient behavior of the interaction of triple transitional fountains injected from three round sources into a homogeneous fluid using the PIV technique over the Reynolds and Froude numbers in the ranges 100<=Re<=1000 and 1<=Fr<=10. The results show that the behavior of the interaction can be categorized into several distinct regimes: (a) Flapping steady regime, where the flow in the interaction region sways horizontally initially but soon becomes stable with no fluctuation in the interaction height and negligible horizontal sway; (b) Bobbing-flapping steady regime, where the interaction region bobs initially with a repeated up-and-down height and three-dimensional horizontal swaying behaviour, but at full development, the interaction becomes steady; (c) Flapping unsteady and bobbing-flapping unsteady regimes, where the behaviours of steady and unsteady interactions are quite similar with the exception that, in the unsteady regime, the interaction remains unsteady even at full development, with fluctuating maximum interaction height and continual swaying; and (d) Transitional/turbulent unsteady regime, where the interaction demonstrates strong unsteadiness and oscillating behavior starting from the beginning. All these observed characteristics are also mapped into a Re-Fr diagram.

Item ID: 24259
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: transitional fountain; interaction of triple fountain; PIV; Reynolds number; Froude number
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ISBN: 978-0-646-58373-0
Funders: National Natural Science Foundation of China, Natural Science Foundation of Yunnan Province, China, Australian Research Council, Specialized Research Fund for the Doctoral Program of Higher Education, China, Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China
Date Deposited: 04 Jan 2013 05:14
FoR Codes: 09 ENGINEERING > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 100%
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