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TECHNICAL PAPERS

Simulation of Spray Transfer Processes in Electrostatic Rotary Bell Sprayer

[+] Author and Article Information
Kyoung-Su Im, Ming-Chia Lai, Sheng-Tao John Yu

Department of Mechanical Engineering, Wayne State University, Detroit, Michigan 48202, USA

Robert R. Matheson

Dupont Herberts Automotive Systems, Troy, Michigan 48007, USA

J. Fluids Eng 126(3), 449-456 (Jul 12, 2004) (8 pages) doi:10.1115/1.1758263 History: Received September 13, 2002; Revised February 04, 2004; Online July 12, 2004
Copyright © 2004 by ASME
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References

Bell, C. C., and Hochberg, J., 1981, “Mechanisms of Electrostatic Atomization, Transport, and Deposition of Coatings,” Proc. 7th International Conference in Organic Science and Technology, Athens, Greece.
Im,  K.-S., Lai,  M.-C., Liu,  Y., Sankagiri,  N., Loch,  T., and Nivi,  H., 2001, “Visualization and Measurement of Automotive Electrostatic Rotary-Bell Paint Spray Transfer Processes,” J. Fluid Mech., 123, pp. 237–245.
Liu,  Y., Lai,  M.-C., Im,  K.-S., Shankagiri,  N., Loch,  T., and Nivi,  H., 1999, “An Experimental Investigation of Spray Transfer Processes in an Electrostatic Rotating Bell Applicator,” SAE Transaction Journal of Material Manufacturing, 107(5), pp. 1235–1243.
Bellan,  J., 1983, “A New Approach to Soot Control in Diesel Engines by Fuel-Drop Charging,” Combust. Flame, 51, pp. 117–119.
True,  M. A., 1983, “Modeling of Electrostatic Spray Plumes,” IEEE Transaction on Industry Applications, IA-19 5, pp. 754–758.
Elmoursi,  A. A., 1989, “Laplacian Fields of Bell-Type Electrostatic Painting Systems,” IEEE Transaction on Industry Application, 25(2), pp. 234–240.
Grace, J. M., and Dunn, P. F., 1994, “Droplet Motion in an Electrohydrodynamic Fine Spray,” Proc. 6th International Conference on Liquid Atomization and Spray Systems, Rouen, France, pp. 1002–1009.
Shrimpton, J. S., Watkins, A. P., and Yule, A. J., 1997, “A Turbulent, Transient Charged Spray Model,” Proc. 7th International Conference on Liquid Atomization and Spray Systems, Seoul, Korea, pp. 820–827.
Miller, R., Strumolo, G., Babu, V., Braslaw, J., and Mehta, M., 1998, “Transient CFD Simulations of a Bell Sprayer,” Proc. of the IBEC’98, 4, pp. 29–37.
Huang, H., Lai, M.-C., Meredith, M., 2000, “Simulation of Spray Transport from Rotary Cup Atomizer using KIVA-3V,” the 10th International KIVA User’s Group Meeting, Detroit.
Chang,  S. C., 1995, “The Method of Space-Time Conservation Element and Solution Element—A New Approach for Solving the Navier Stokes and Euler Equations,” J. Comput. Phys., 191, pp. 295–324.
Zhang, Z.-C., Yu, S.-T., Chang, S. C., Himansu, A., and Jorgenson, P. C. E., 1999, “A Modified Space-Time CE/SE Method for Solving Euler and Navier-Stokes Equations,” AIAA Paper 99–3277.
Anderson, D. A., Tannehill, J. C., and Pletcher, R. H., 1984, Computational Fluid Mechanics and Heat Transfer, Hemisphere.
Dukowicz,  J. K., 1980, “A Particle-Fluid Numerical Model for Liquid Sprays,” J. Comput. Phys., 35, pp. 229–253.
Fureby,  C., and Grinstein,  F. F., 1999, “Monotonically Integrated Large Eddy Simulation of Free Shear Flow,” AIAA J., 37(5), pp. 544–556.
Amsden, A. A., O’Rourke, P. J., and Butler, T. D., 1989, “KIVA-II: A Computer Program for Chemically Reactive Flows with Sprays,” Los Alamos National Laboratory Report, LA-11560-MS.

Figures

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Sensitivity of the spray flow to bell speed at the following operating conditions: 150 l/min of shaping air, 90kV of electric force, and 150 ml/min of liquid flow rate
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Drop mass distribution on the target plane along z-axis direction at y=center
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Regions: a) near field, b) transport field, and c) target field of the paint spray
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The interactions of three main processes in transport field
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A schematic of the computational domain
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Bell atomizers: a) original, b) numerical
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Initial and boundary conditions reconstructed from experimental data
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Electrostatic potential contours at different positions
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Velocity components (u,v,w) on the z-axis at y=center
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Air flow angular velocity in the z-direction at different axial positions
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Comparison of the numerical and experimental spray characteristics at the following operating condition: 150 l/min of shaping air, 50k rpm of bell speed, 90kv of electric force, and 150 ml/min liquid flow rate
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Sensitivity of the spray flow to charge to mass ratio at the following operating condition: 30k rpm of bell speed, 150 l/min of shaping air, 90kV of electric setting, and 150 ml/min of liquid flow rate

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