Original Articles
Vol. 52 No. 1 (2021)
https://doi.org/10.4081/jae.2021.1104

Computational fluid dynamic simulation of a pulse-width modulated spray nozzle

Publisher's note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.
Received: 8 July 2020
Accepted: 19 November 2020
Published: 18 March 2021
3281
Views
994
Downloads
391
HTML
Pulsed sprayer nozzles, Reynolds averaged Navier-Stokes, agricultural sprayer nozzles.

Authors

Zachary Chapman
Mechanical Engineering Department, South Dakota State University, Brookings, SD, United States.
Jeffrey Doom
jeffrey.doom@sdstate.edu
Mechanical Engineering Department, South Dakota State University, Brookings, SD, United States.

Computational fluid dynamics (CFD) is a useful tool used by engineers in many industries to study fluid flow. A relatively new industry to adopt the use of CFD is the agricultural industry. A spray nozzle commonly used in agricultural spraying, the Teejet 110-degree nozzle (TeeJet Technologies, 2020), was simulated. A method was developed to pulse the spray. A user-defined function was used to define the velocity at the inlet of the nozzle to pulse the spray. The domain was then extended to allow the examination of a slice 20 inches below the nozzle. The simulation results were compared to experimental results collected from a sprayer testbed. The effect of frequency was then investigated by changing the frequency of the pulses. Results from these studies show that a userdefined function can be used to pulse the spray. CFD can be used to model spray nozzles, but the validity of the results are strongly related to the computational resources available, and increasing the frequency of the pulses results in a higher concentrated spray toward the center of the spray plume. The simulations were carried out using a commercial code (CD-Adapco, 2019).

Downloads

Download data is not yet available.

Citations

Bade K., Kalata W., Schick R. 2010. Experimental and computational study of a spray at multiple injection angles. ILASS Americas, 22nd Annual Conference on Liquid Atomization and Spray Systems, Cincinnati, OH, USA.
Siemens, 2020. Available from: https://www.plm.automation.siemens.com/global/en/products/simcenter/STAR-CCM.html, Accessed: 01 January, 2020.
Chapman Z. 2020. Using computational fluid dynamics to accurately model agricultural spray nozzles. Degree Diss. South Dakota State University.
Dekeyser D., Duga A.T., Verboven P., Endalew A.M. 2013. Assessment of orchard sprayers using laboratory experiments and computational fluid dynamics modelling. Biosyst. Engine. 157:169-214. DOI: https://doi.org/10.1016/j.biosystemseng.2012.11.013
Endalew A.M., Debaer C., Rutten N., Vercammen J., Delele M.A., Ramon H., Nicolai B., Verboven P. 2020. A new integrated cfd modelling approach towards air-assisted spraying part ii: Validation for different sprayers types. Comput. Electron. Agricult. 137:147-71.
Ferziger J., Peric M. 2002. Computation methods for fluid dynamics. 3rd ed. Springer International Publishing, New York, NY, USA. DOI: https://doi.org/10.1007/978-3-642-56026-2
Moukalled F., Mangani L., Darwish M. 2016. The finite volume method in computational fluid dynamics. Springer International Publishing, New York, NY, USA. DOI: https://doi.org/10.1007/978-3-319-16874-6
Sidamed M., Taher M., Brown R. 2005. A virtual nozzle for simulation of spray generation and droplet transport. Biosyst. Engine. 295:307-92. DOI: https://doi.org/10.1016/j.biosystemseng.2005.07.012
TeeJet Technologies. 2013. A user’s guide to spray nozzles. Available: http://www.teejet.com/
TeeJet Technologies. 2020. A user’s guide to spray nozzles. Available: http://www.teejet.com/
Tryggvason G., Scardovelli R., Zaleski S., 2011. Direct numerical simulations of gas-liquid multiphase flows. Cambridge University Press, Cambridge, UK.
United States Environmental Protection Agency. 2019. Introduction to pesticide drift. Available from: http://www.epa.gov/reducing-pesticide-drift/introduction-pesticide-drift#effects

How to Cite



“Computational fluid dynamic simulation of a pulse-width modulated spray nozzle” (2021) Journal of Agricultural Engineering, 52(1). doi:10.4081/jae.2021.1104.