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Research Papers: Fundamental Issues and Canonical Flows

Spray Characteristics of Elliptical Power-Law Fluid-Impinging Jets

[+] Author and Article Information
Fei Zhao

School of Astronautics,
Beijing University of Aeronautics and
Astronautics,
Beijing 100191, China
e-mail: zfly87@163.com

Li-Zi Qin

School of Astronautics,
Beijing University of Aeronautics
and Astronautics,
Beijing 100191, China
e-mail: qinlizi@126.com

Qing-Fei Fu

School of Astronautics,
Beijing University of Aeronautics
and Astronautics,
Beijing 100191, China
e-mail: fuqingfei@buaa.edu.cn

Chao-Jie Mo

School of Astronautics,
Beijing University of Aeronautics
and Astronautics,
Beijing 100191, China
e-mail: mochaojie@gmail.com

Li-Jun Yang

School of Astronautics,
Beijing University of Aeronautics
and Astronautics,
Beijing 100191, China
e-mail: yanglijun@buaa.edu.cn

1Present address: School of Astronautics, Beijing University of Aeronautics and Astronautics, B1007 New Main Building, Beijing 100191, China.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 17, 2016; final manuscript received February 15, 2017; published online April 24, 2017. Assoc. Editor: Kausik Sarkar.

J. Fluids Eng 139(7), 071203 (Apr 24, 2017) (9 pages) Paper No: FE-16-1180; doi: 10.1115/1.4036164 History: Received March 17, 2016; Revised February 15, 2017

The spray characteristics of a liquid sheet contribute much to the investigation of atomization efficiency. Considering the jet contracting effect of elliptical jets, an improved model of elliptical power-law fluid jets is proposed herein to derive the spray characteristics. Some experiments have been conducted to verify its feasibility, and the results show a good agreement with theoretical predictions. The effect of the aspect ratio on sheet shape and thickness has been studied to interpret the phenomenon that liquid sheets formed by the impinging elliptical jets are more likely to disintegrate. The relationships between rheological parameters (K and n) and the spray features are also discussed.

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Figures

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Fig. 1

Jet discharging from an elliptical orifice: (a) experimental results and (b) diagrammatic sketch

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Fig. 2

Schematic of (a) sheet formation and (b) impact cross section

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Fig. 3

Control volume used to establish conservation equations

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Fig. 4

Control volume used for the force balances

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Fig. 5

Shear viscosity versus shear rate for the 1.0% mass concentration working fluid

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Fig. 6

Internal structure of impinging jet injector

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Fig. 7

Comparisons between the experimental results and theoretical predictions: (a) I1, vj = 8.21 m/s; (b) I2, vj = 8.07 m/s; and (c) I3, vj = 7.85 m/s

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Fig. 8

Comparisons of sheet length L between the experimental results and theoretical predictions with the increasing jet velocity vj for different nozzle orifices

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Fig. 9

Comparisons of sheet length W between the experimental results and theoretical predictions with the increasing jet velocity vj for different nozzle orifices

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Fig. 10

Spray snapshots of liquid sheet for three injectors at different jet velocities: (a) I1, vj = 20.5 m/s, (b) I2, vj = 21.1 m/s, (c) I3, vj = 19.8 m/s, (d) I1, vj = 28.6 m/s, (e) I2, vj = 30.2 m/s, and (f) I3, vj = 29.7 m/s

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Fig. 11

Break lengths for these three injectors at different jet velocities

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Fig. 12

Theoretical sheet contours when aspect ratio increases from 1:1 to 6:1 at 2α = 90 deg, vj = 8.0 m/s, K = 3.25, n = 0.169, and Ic = 5.6 mm

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Fig. 13

Theoretical sheet thickness when aspect ratio increases from 1:1 to 6:1 at 2α = 90 deg, vj = 8.0 m/s, K = 3.25, n = 0.169, and Ic = 5.6 mm

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Fig. 14

Theoretical sheet contours when K increases from 1 to 10 at 2α = 90 deg, vj = 8.0 m/s, n = 0.169, aspect ratio 4:1, and Ic = 5.6 mm

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Fig. 15

Theoretical sheet thickness when K increases from 1 to 10 at 2α = 90 deg, vj = 8.0 m/s, n = 0.169, aspect ratio 4:1, and Ic = 5.6 mm

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Fig. 16

Theoretical sheet contours when n increases from 0.1 to 0.4 at 2α = 90 deg, vj = 8.0 m/s, K = 3.25, aspect ratio 4:1, and Ic = 5.6 mm

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Fig. 17

Theoretical sheet thickness when n increases from 0.1 to 0.4 at 2α = 90 deg, vj = 8.0 m/s, K = 3.25, aspect ratio 4:1, and Ic = 5.6 mm

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