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Technical Brief

Empirical Correlation of the Primary Stability Variable of Liquid Jet and Liquid Sheet Under Acoustic Field

[+] Author and Article Information
V. Sivadas

Associate Professor
Department of Aerospace Engineering,
Amrita School of Engineering,
Amrita Vishwa Vidyapeetham (University),
Coimbatore 641112, India
e-mails: vayalakkara@yahoo.co.in;
v_sivadas@cb.amrita.edu

K. Balaji

Assistant Professor
Department of Mechanical Engineering,
Amrita School of Engineering,
Amrita Vishwa Vidyapeetham (University),
Coimbatore 641112, India
e-mail: k_balaji@cb.amrita.edu

M. Sampathkumar

Mechanical Engineering,
University of Leuven—KU Leuven,
Oude Markt 13, bus 5005,
Leuven 3000, Belgium
e-mail: sampath.kumar.mulagaleti@gmail.com

M. M. Hassan

L&T Construction,
Chennai 600 089, India
e-mail: mehmoodul@gmail.com

K. M. Karthik

Apollo Tyres,
Thrissur 680689, India
e-mail: Karthik8000@gmail.com

Koneru Saidileep

Mechanical Engineering,
Amrita School of Engineering,
Amrita Vishwa Vidyapeetham (University),
Coimbatore 641112, India
e-mail: Saidileep543@gmail.com

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 22, 2015; final manuscript received February 16, 2016; published online May 18, 2016. Assoc. Editor: John Abraham.

J. Fluids Eng 138(8), 084501 (May 18, 2016) (6 pages) Paper No: FE-15-1677; doi: 10.1115/1.4033028 History: Received September 22, 2015; Revised February 16, 2016

The investigation focuses on optimizing the length of wind-pipe that transmits acoustic energy from the compression driver to the cavity of twin-fluid atomizers. To accomplish this objective, the primary variable of stability, that is, the breakup length of liquid jet and sheet under acoustic perturbations has been experimentally characterized for a range of wind-pipe length and liquid velocity. The analysis considers liquid phase Weber number in the range of 0.7–8, and the results are compared with primary breakup data without acoustic perturbations. The range of Weber number tested belongs to Rayleigh breakup zone, so that inertia force is negligible compared to surface tension force. It shows the existence of unique stability functions based on dimensionless products up to an optimum wind-pipe length, which extends greater for liquid sheet configuration. The present results may find relevance in atomizer design that utilizes acoustic source to enhance liquid column breakup processes.

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References

Figures

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Fig. 1

Sketch of the acoustic atomizers: (a) liquid jet and (b)liquid sheet

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Fig. 2

Three-dimensional map of static pressure fluctuations of the acoustically excited cavities: (a) cylindrical cavity (Lwp = 0.375 m) and (b) planar cavity (Lwp = 0.1 m)

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Fig. 3

Phase difference in the acoustically excited cavities asa function of downstream locations: (a) cylindrical cavity (Lwp = 0.375 m and ωn = 360 Hz) and (b) planar cavity (Lwp = 0.1 m and ωn = 980 Hz)

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Fig. 4

SPL of the speaker and wind-pipe length as a function of frequency: (a) cylindrical cavity and (b) planar cavity

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Fig. 5

Images of liquid jet and sheet breakup processes

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Fig. 6

Breakup length as a function of velocity and wind-pipe length: (a) liquid jet and (b) liquid sheet

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Fig. 7

Universal correlation of breakup length under acoustic perturbations: (a) liquid jet and (b) liquid sheet

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