The influence of strainer types on the flow and droplet velocity characteristics of ceramic flat-fan nozzles

This study focused on determining the effect of various strainer types and their usage without strainer on the flow and droplet velocity characteristics of ceramic flat-fan nozzles. The nozzle types discussed are the standard (APE), low pressure drift reduction (ADI), and wide pressure range (AXI). The results of this study show that the orifice coefficient (k) of the ADI nozzle with a preorifice was lower than those of the API and AXI nozzles. The ball check strainers had a limiting effect on the nozzle s flow rate. The pressure exponent coefficients (n) were 0.57 for the API nozzle and 0.62 for the ADI and AXI nozzles used with ball check strainers. The n coefficient ranged from 0.47 to 0.49 for the API and AXI nozzles and from 0.50 to 0.53 for the ADI nozzle, used with typical strainers and without a strainer. The flow rate deviations of APE, ADI, and AXI nozzles used with a ball check strainer were determined as 12.0%,11.4%, and 14.5%, respectively. The lowest Cdmeans were found in all nozzle types with ball check strainers, and the means were determined as 0.45, 0.58, and 0.71 for the ADI, AXI, and API nozzles, respectively. The Cdmeans of the nozzles with typical strainers, which is the same as usage without a strainer, were between 0.58 and 0.60 for the ADI nozzle, 0.82 and 0.85 for the AXI nozzle, and 0.91 and 0.94 for the API nozzle. Knowledge of the discharge coefficient of the nozzles used with various strainer types provided a reasonable estimation of the maximum droplet velocity at the nozzle orifice exit. The maximum droplet velocity at the nozzle orifice exit increased as droplet size increased. The droplets produced by the nozzles with ball check strainers had features that restricted the nozzle s flow. These were higher maximum velocity, kinetic energy, and stopping distance.

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Agrotop GmbH (2010). Spray Nozzles and Accessories for Crop Protection. Product Catalogue, 107/E. Obertraubling, Germany: Agrotop.
Al-Heidary M, Douzals JP, Sinfort C, Vallet A (2014). Influence of nozzle type, nozzle arrangement and side wind speed on spray drift as measured in a wind tunnel. In: Proceedings of the IRSTEA International Conference of Agricultural Engineering, 67 July 2014; Zurich, Switzerland. Montpelier, France: National Research Institute of Science and Technology for Environment and Agriculture, pp. 17.
Albuz (2013). Spray Nozzles. Product Catalogue. Gravigny, France: Albuz.
ASABE (2009). ANSI/ASAE S572.1: MAR1991. Spray Nozzle Classification by Droplet Spectra. St. Joseph, MI, USA: ASABE.
ASABE (2012). Guide for Preparing Field Sprayer Calibration Procedures. ASAE EP367.2 MAR1991 (R2012). St. Joseph, MI, USA: ASABE.
ASME (1961). Flowmeter Computational Handbook. New York, NY, USA: American Society of Mechanical Engineers.
Bache DH, Johnstone DR (1992). Microclimate and Spray Dispersion. Chichester, UK: Ellis Harwood.
Ballester J, Dopazo C (1994). Discharge coefficient and spray angle measurements for small pressure-swirl nozzles. Atomization Spray 4: 351367.
Bete Inc. (2014). Bete Spray Nozzles, Engineering Information Catalogue. Greenfield, MA, USA: Bete.
Çelen IH, Önler E (2011). Reducing spray drift. In: Stoytcheva M, editor. Pesticides in the Modern World Pesticides Use and Management. Rijeka, Croatia: InTech, pp. 149168.
Halder MR, Dash SK, Som SK (2004). A numerical and experimental investigation on the coefficients of discharge and the spray cone angle of a solid cone swirl nozzle. Exp Therm Fluid Sci 28: 297305.
Hansen PD (1993). Chemical application. In: Srivastava AK, Goering CE, Rohrbach RG, editors. Engineering Principles of Agricultural Machines. St. Joseph, MI, USA: American Society of Agricultural Engineers, pp. 265324.
Hofman VL, Solseng EG (2004). Spray Equipment and Calibration. Fargo, ND, USA: North Dakota State University.
Hussein A, Hafiz M, Rashid H, Halim A, Wisnoe W, Kasolang S (2012). Characteristics of hollow cone swirl spray at various nozzle orifice diameters. Jurnal Teknologi 58: 14.
Huyghebaert B, Debouche C, Mostade O (2001). Flow rate quality of new flat fan nozzles. T ASABE 44: 769773.
Iqbal M, Ahmad M, Younis M (2005). Effect of Reynolds number on droplet size of hollow cone nozzle of environment friendly university boom sprayer. Pak J Agri Sci 42: 106111.
Lechler GmbH (2004). Agrardüsen und Zubehör. Metzingen, Germany: Lechler GmbH.
Lefebvre AH (1989). Atomization and Sprays. New York, NY, USA: Taylor and Francis.
Lienhard V (1984). Velocity coefficients for free jets from sharpedged orifices. J Fluid Eng 106: 1317.
Miller PCH (1999). Factors influencing the risk of drift into field boundaries. In: Proceedings of the Brighton Crop Protection Conference, 1518 November 1999; Brighton, UK. Alton, UK: British Crop Protection Council, pp. 436-446.
Nuyttens D, Baetens K, De Schampheleire M, Sonck B (2007). Effect of nozzle type, size and pressure on spray droplet characteristics. Biosyst Eng 97: 333345.
Nuyttens D, De Sphampheleire M, Verboven P, Brusselman E, Dekeyser D (2009). Droplet size and velocity characteristics of agricultural sprays. T ASABE 52: 14711480.
Rashid MSFM, Hamid AHA, Sheng OC, Ghaffar ZA (2012). Effect of inlet slot number on the spray cone angle and discharge coefficient of swirl atomizer. Procedia Eng 41: 17811786.
Sarker KU, Parkin CS (1995). Prediction of spray drift from flat-fan hydraulic nozzles using dimensional analysis. In: Proceedings of the Brighton Crop Protection Conference, 2023 November 1995; Brighton, UK. Farnham, UK: British Crop Protection Council, pp. 529534.
Sayıncı B (2014). Effect of filter types and sizes on flow characteristics of standard flat-fan nozzles. Tarım Makinaları Bilimi Dergisi 10: 129138 (article in Turkish with abstract in English).
Sayıncı B, Bozdoğan NY, Yıldız C, Demir B (2013). Determination of discharge coefficient and some operational features of hollow cone nozzles. Tarım Makinaları Bilimi Dergisi 9: 920 (article in Turkish with abstract in English).
Spraying Systems Co. (2014). Industrial Hydraulic Spray Products. Catalogue 75. Wheaton, IL, USA: Spraying Systems Co.
Turkish Standards Institution (2008). TS EN 13790-1, Tarım Makinaları - Pülverizatörler - Kullanımdaki Pülverizatörlerin Muayenesi - Bölüm 1: Tarla Pülverizatörleri. Ankara, Turkey: TSI (in Turkish).
Wilkinson R, Balsari P, Oberti R (1999). Pest control equipment. In: Stout BA, Cheze B, editors. CIGR Handbook of Agricultural Engineering. Vol. III. St. Joseph, MI, USA: American Society of Agricultural Engineers, pp. 269310.
Womac AR, Bui QD (2002). Design and tests of a variable-flow fan nozzle. T ASABE 45: 287295.
Yu B, Fu PF, Zhang T, Zhou HC (2013). The influence of back pressure on the flow discharge coefficients of plain orifice nozzle. Int J Heat Fluid Fl 44: 509514.
Zhou Q, Miller PCH, Walklate PJ, Thomas NH (1996). Prediction of spray angle from flat-fan nozzles. J Agr Eng Res 64: 139148.