Dynamics of Swirling Flows in a Diverging Pipe PDF Download
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Author: Z. Rusak
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Z. Rusak
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Radu Cazan
Publisher:
ISBN:
Category : Eddies
Languages : en
Pages :
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The present study describes the flow characteristics of swirling flows induced by twisted tape inserts in circular pipes. The study is focused on the secondary flow which is investigated experimentally and with numerical models. The results are expected to improve the paper manufacturing process by identifying and removing the detrimental secondary flow. Experimental tests show for the first time the existence of two co-rotating helical vortices superimposed over the main swirling flow, downstream of twisted tapes. The close proximity of the two co-rotating vortices creates a local counter-rotating flow at the pipe centerline. The flow is analyzed using LDV measurements and high speed camera visualization with fine air bubbles seeding which confirm that the helical vortices are stable. After extracting the characteristic tangential velocity profiles of the main vortex and of the two secondary vortices, it was observed that the maximum tangential velocity of all three vortices is the same, approximately half of the bulk velocity. The winding of the helical vortices is in the swirl direction and the pitch of the helical vortices is found to be independent of the inlet velocity. The experimental findings are confirmed by numerical simulations. The numerical results show that the helical vortices originate inside the swirler and evolve from single co-rotating vortices on each side of the tape. The flow characteristics are analyzed in detail. Swirlers with multiple twists and multiple chambers are shown to have less stable secondary motion and could be employed in applications were the secondary motion is detrimental.
Author: Xiaoyang Li
Publisher:
ISBN:
Category : Bifurcation theory
Languages : en
Pages : 49
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A complete analysis of the steady flow states of swirling flows in diverging (or converging) pipes was developed. The uniqueness of the steady flow state in a certain swirl range was rigorously proved by using nonlinear functional analysis. The co-existence of multiple steady states of swirling flows in diverging (or converging) pipes for the swirl beyond the uniqueness range were demonstrated numerically. A complete global bifurcation diagram of the flow steady state was also developed by using computational methods. By using the steady flow states obtained by the research described above one may investigate the linear stability of the steady-state flow in various swirl ranges. Due to limited scope of this research, detailed stability analysis will be carried out in future. This research will lead to a deeper understanding of the instability mechanism of the swirling flow in a diverging (or converging) pipe.
Author: Nicholas R. Bourquard
Publisher:
ISBN:
Category :
Languages : en
Pages : 150
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Author: Heather Lynn McClusky
Publisher:
ISBN:
Category :
Languages : en
Pages : 548
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Author: James Davis Cresswell
Publisher:
ISBN:
Category : Pipe
Languages : en
Pages : 70
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Author: Egon Krause
Publisher: Springer Science & Business Media
ISBN: 9401150427
Category : Technology & Engineering
Languages : en
Pages : 473
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The decision of the General Assembly of the International Union of Theoretical and Applied Mechanics to organize a Symposium on Dynamics of Slender Vortices was greeted with great enthusiasm. The acceptance of the proposal, forwarded by the Deutsches Komitee fiir Mechanik (DEKOMECH) signalized, that there was a need for discussing the topic chosen in the frame the IUTAM Symposia offer. Also the location of the symposium was suitably chosen: It was decided to hold the symposium at the RWTH Aachen, where, years ago, Theodore von Karman had worked on problems related to those to be discussed now anew. It was clear from the beginning of the planning, that the symposium could only be held in the von Karman-Auditorium ofthe Rheinisch-Westfalische Technische Hochschule Aachen, a building named after him. The symposium was jointly organized by the editors of this volume, strongly supported by the local organizing committee. The invitations of the scientific committee brought together scientists actively engaged in research on the dynamics of slender vortices. It was the aim of the committee to have the state of the art summarized and also to have the latest results of specific problems investigated communicated to the participants of the symposium. The topics chosen were asymptotic theories, numerical methods, vor tices in shear layers, interaction of vortices, vortex breakdown, vortex sound, and aircraft and helicopter vortices.
Author: Juri Toomre
Publisher:
ISBN:
Category :
Languages : en
Pages : 202
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Author: Robert Milano
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Wiendelt Steenbergen
Publisher:
ISBN: 9789038604046
Category :
Languages : en
Pages : 187
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