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

Abstract

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 C d means 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 C d means 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.

Droplet Kinematic in Hollow Cone Polyacetal (POM) Sprayer Nozzles

“…Her bir meme plakasında renk, slot sayısı veya malzeme özellikleri farklı 4 çeşit girdap plaketi (mavi, 2-slot, POM; kahverengi, 3-slot, POM; sarı, 2-slot, POM; paslanmaz çelik, 2-slot) kullanılmıştır. Pülverizatör memeleri için süzgeçler, akış karakteristiğini değiştirdiğinden (Sayıncı ve Kara 2015;Sayıncı 2014;Sayıncı 2015;Sayıncı 2016) 0.084±0.006 a 0.084±0.009 a 0.078±0.008 a 0.082±0.008 a 0.077±0.006 a F değeri (p, sigma) 37.22 (0.000)** 24.74 (0.000) 24.52 (0.000) 30.62 (0.000) 32.86 (0.000) Ø1.2…”

“…(2007) tarafından yapılan damla çapı ölçümlerinde 3 bar basınçta standart yelpaze hüzmeli bir memede (APE 11002) 208.3 µm, geniş spektrumlu standart tip bir memede (AXI 11002) 207.0 µm olarak ölçülmüştür. AyrıcaSayıncı (2016) damlanın sahip kinetik enerjinin yelpaze hüzmeli memelerde 0.5-1.2 µj aralığında değiştiğini saptamıştır. Literatür bulgularıyla karşılaştırıldığında konik hüzmeli memelerle üretilen damla çaplarının ve sahip olduğu kinetik enerjinin standart yelpaze hüzmeli memelerden daha düşük olduğu gözlemlenmiştir.Damlanın terminal hızı üretilen damlaların çapına bağlı olarak pozitif yönde değişmektedir.…”

“…etkiler nedeniyle damlanın yörüngede kalma direncinin düşük olduğunu göstermektedir. Standart yelpaze hüzmeli bir memede terminal hızın 1.2-1.4 m/s aralığında değiştiği belirlenmiştir(Sayıncı 2016). Konik hüzmeli meme plakalarında belirtilen terminal hız aralığına 2 bar basınçta 2.0 mm ve 2.4 mm orifis çaplı memelerle ulaşılmıştır.…”

Discharge Coefficients of Flat Fan Nozzles

“…Most of the reported measurements of discharge coefficient reported in the literature are those by Sayinci (2015aSayinci ( , 2015b and Sayinci and Kara (2015), as well as the measurements by Womac and Bui (2002) and Zhou et al (1996). In research where droplet velocities have been measured at the location of sheet breakup, such as with PIV, those velocities can be used to calculate the discharge coefficient as well.…”

Spectrum and Velocity of Droplets of Spray Nozzles With and Without Air Induction

“…Wang et al (2015), studying the performance of spray nozzles by image analysis, stated that the relation between droplet size and velocity still needs more scientific studies for their understanding. Sayinci (2015) also showed that this relation is unclear and attribute this to high velocity variation for droplets of the same size in a spray jet.…”