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Research Papers: Multiphase Flows

Experimental Characterization of Intrinsic Properties Associated With Air-Assisted Liquid Jet and Liquid Sheet

[+] Author and Article Information
K. Balaji

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

V. Sivadas

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

Vishnu Radhakrishna

Department of Aerospace Engineering,
Amrita School of Engineering,
Amrita Vishwa Vidyapeetham,
Coimbatore 641112, India
e-mail: vishnurkrishna0306@gmail.com

Khushal Ashok Bhatija

Department of Mechanical Engineering,
Amrita School of Engineering,
Amrita Vishwa Vidyapeetham,
Coimbatore 641112, India
e-mail: khuzi.bhatija@gmail.com

K. Sai Charan

Department of Mechanical Engineering,
Amrita School of Engineering,
Amrita Vishwa Vidyapeetham,
Coimbatore 641112, India
e-mail: saicharankatamreddy@gmail.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received July 27, 2017; final manuscript received December 4, 2017; published online January 24, 2018. Assoc. Editor: Praveen Ramaprabhu.

J. Fluids Eng 140(5), 051301 (Jan 24, 2018) (9 pages) Paper No: FE-17-1456; doi: 10.1115/1.4038759 History: Received July 27, 2017; Revised December 04, 2017

The present study focuses on experimental characterization of interfacial instability pertinent to liquid jet and liquid sheet in the first wind-induced zone. To accomplish this objective, the interfacial wave growth rate, critical wave number, and breakup frequency associated with air-assisted atomizer systems were extracted by utilizing high-speed flow visualization techniques. For a range of liquid to gas velocities tested, nondimensionalization with appropriate variables generates the corresponding correlation functions. These functions enable to make an effective comparison between interfacial wave developments for liquid jet and sheet configurations. It exhibits liquid sheets superiority over liquid jets in the breakup processes leading to efficient atomization.

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References

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Figures

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Fig. 1

Sketch of air-assisted liquid atomizers: (a) liquid jet and (b) liquid sheet

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Fig. 2

Schematic of the experimental setup

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Fig. 3

Qualitative images of liquid jet (Ul = 2.14 m/s)

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Fig. 4

Qualitative images of liquid sheet (Ul = 3.21 m/s)

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Fig. 5

Stretching factor as a function of Weber number ratio: (a) liquid jet and (b) liquid sheet

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Fig. 6

Interfacial wave growth rate as a function of liquid and air velocities: (a) liquid jet and (b) liquid sheet

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Fig. 7

Nondimensional interfacial wave growth rate as a function of Weber number ratio: (a) liquid jet and (b) liquid sheet

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Fig. 8

Comparison of interfacial wave growth rate between liquid jet and sheet

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Fig. 9

Critical wave number as a function of liquid and air velocities: (a) liquid jet and (b) liquid sheet

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Fig. 10

Nondimensional critical wave number as a function of Weber number ratio: (a) liquid jet and (b) liquid sheet

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Fig. 11

Comparison of critical wave number between liquid jet and sheet

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Fig. 12

Breakup frequency as a function of liquid and air velocities: (a) liquid jet and (b) liquid sheet

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Fig. 13

Nondimensional breakup frequency as a function of Weber number ratio: (a) liquid jet and (b) liquid sheet

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Fig. 14

Comparison of breakup frequency between liquid jet and sheet

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Fig. 15

Comparison of dimensionless critical wave number with theory and experiment

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Fig. 16

Comparison of nondimensional breakup frequency

Tables

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