Computational study of internal flow characteristics of the air induction nozzle

Abdelmotalib, Hamada; Dafsari, Reza Alidoost; Sui, Yu

doi:10.1016/j.ijmecsci.2021.106578

Cited by 9 publications

(5 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The larger droplet size produced by the AI apparently reduced the drift, increasing the number of droplets that reached the target, thus increasing the coverage. Abdelmotalib et al [ 39 ] reported that when the droplets generated by air induction nozzles impact the target surface, they are fragmented into smaller droplets, which reduces the drift potential and allows for better controlled application, which may improve coverage.…”

Section: Resultsmentioning

confidence: 99%

Control of Urochloa decumbens Using Glyphosate Applied by Remotely Piloted Aircraft and Ground Sprayer with Different Spray Nozzles

Lopes,

Cunha,

Nomelini

et al. 2024

Plants

View full text Add to dashboard Cite

The use of remotely piloted aircraft (RPA) to spray pesticides currently occurs, but knowledge about this technology is lacking due to the different locations, targets, and products applied. The objective of this study was to evaluate the control of Urochloa decumbens with glyphosate applied using an RPA (10 L ha−1) equipped with different spray nozzles (XR 11001 and AirMix 11001). For the purpose of comparison, ground application was also performed (100 L ha−1). The deposition was evaluated by means of the quantification of a tracer by spectrophotometry, the droplet spectrum was evaluated with water-sensitive paper, and the control efficiency was evaluated based on visual measurements with percentage scores. Statistical process control was used to analyse the quality of the deposition in the area. The results showed that the application via RPA presented a greater amount of tracer on the leaves than the ground application, suggesting that the former is a good option for application, even providing a lower coverage and number of droplets per area. Both application methods were effective at controlling Urochloa decumbens. The nozzles showed potential for use in applications, with control efficiency higher than 84% from 21 days after application. The percentage of droplets smaller than 100 μm in the applications was less than 5%. No nonrandom behaviour was observed during deposition, indicating a high-quality process.

show abstract

Section: Resultsmentioning

confidence: 99%

Control of Urochloa decumbens Using Glyphosate Applied by Remotely Piloted Aircraft and Ground Sprayer with Different Spray Nozzles

Lopes,

Cunha,

Nomelini

et al. 2024

Plants

View full text Add to dashboard Cite

show abstract

“…In this type of spray nozzle, during the spraying process, air is entrained using the Venturi effect and then mixed with the spray solution as the fluid flows through the nozzle, forming a gas-liquid stream. (Abdelmotalib et al, 2021). Its main feature is drift reduction, as it typically produces a thicker droplet spectrum (De Cauwer et al, 2023).…”

Section: Depositionmentioning

confidence: 99%

Evaluation of Remotely Piloted Aircraft for Agricultural Spraying in Corn Cultivation in the Brazilian Savannah

Lopes,

Cunha,

Nomelini

2023

JSD

View full text Add to dashboard Cite

This study aimed to evaluate the quality of application using both RPA and ground techniques in corn cultivation using different spray nozzles in Brazilian savannah (Cerrado). The experiment was conducted using a completely randomized design, with four treatments and eight repetitions. The treatments involved two methods of application: aerial (RPA, 10 L ha-1) and ground (backpack sprayer, 100 L ha-1); and two types of nozzles: the standard flat fan nozzle XR 11001 and the air induction flat fan nozzle AirMix 11001. To study the quality of the application, the deposition was evaluated using a tracer and spectrophotometry, and the droplet spectrum, evaluated through the analysis of water-sensitive paper. Furthermore, a study on application quality was conducted using the Statistical Process Control methodology. The results demonstrated that with RPA, the deposition was higher, and the AirMix 11001 nozzle also stood out in this variable. No non-random behavior was observed in the deposition. Ground application showed the best performance in terms of target coverage and droplet density. The XR 11001 nozzle resulted in a higher droplet density. Overall, the XR11001 nozzle and the RPA application showed smaller volume median diameters (VMDs), indicating a higher potential for drift, which should be taken into account. Given the results obtained, it can be stated that the use of RPAs for agricultural spraying is viable for application.

show abstract

“…7 Air is inhaled based on the Venturi effect and then mixed with liquid in the flow passage of the nozzle, forming a gas-liquid flow. 8 It is supposed that the droplets produced by the air-induction spray contain air bubbles; 9,10 therefore, they have relatively large sizes, which contribute to suppression of spray drift. Meanwhile, involvement of bubbles boosts deposition of droplets due to secondary atomization as the droplets impact the target.…”

Section: Introductionmentioning

confidence: 99%

“…The air‐induction nozzle is similar to the standard flat‐fan nozzle but with an additional Venturi‐like structure 7 . Air is inhaled based on the Venturi effect and then mixed with liquid in the flow passage of the nozzle, forming a gas–liquid flow 8 . It is supposed that the droplets produced by the air‐induction spray contain air bubbles; 9,10 therefore, they have relatively large sizes, which contribute to suppression of spray drift.…”

Section: Introductionmentioning

confidence: 99%

Effect of oil‐based emulsion on air bubbles in the spray sheet produced through the air‐induction nozzle

Gong

Kang

2022

Pest Management Science

View full text Add to dashboard Cite

BACKGROUND: The air-induction spray featured by air bubbles involved in the spray sheet has attracted great attention in applications of agricultural spray due to its advantages of alleviating spray drift and promoting deposition. The objective of the presented study is to deepen the understanding of the mechanism of the air-induction spray through elucidating the effect of sprayed liquid on characteristics of air bubbles in the spray sheet. RESULTS:The air bubbles with relatively large sizes are stable for a long time span. As velocity of the water spray increases from 6.85 m s −1 to 17.87 m s −1 , average size of the air bubbles decreases from 383.21 ∼m to 236.47 ∼m. With the introduction of organosilicone surfactant, the surface tension of the sprayed liquid decreases from 67.38 mN m −1 to 31.32 mN m −1 ; accordingly, average size of the bubbles decreases from 383.21 ∼m to 160.9 ∼m. Compared to aqueous solutions spray, the oil-based emulsion spray is responsible for relatively small average size of air bubbles as the surface tension and spray velocity are respectively similar. CONCLUSION: Low drainage rate of the bubble lamella contributes to high stability of large air bubbles. The decrease of the average size of air bubbles is responsible for small volumetric median diameter of oil-based emulsion spray compared with water spray. Besides the increase of the spray velocity and the decrease of the surface tension, the Marangoni effect caused by dynamics of oil droplets at air-liquid interface also contributes to the decrease of average size of air bubbles.

show abstract

Computational study of internal flow characteristics of the air induction nozzle

Cited by 9 publications

References 40 publications

Control of Urochloa decumbens Using Glyphosate Applied by Remotely Piloted Aircraft and Ground Sprayer with Different Spray Nozzles

Control of Urochloa decumbens Using Glyphosate Applied by Remotely Piloted Aircraft and Ground Sprayer with Different Spray Nozzles

Evaluation of Remotely Piloted Aircraft for Agricultural Spraying in Corn Cultivation in the Brazilian Savannah

Effect of oil‐based emulsion on air bubbles in the spray sheet produced through the air‐induction nozzle

Contact Info

Product

Resources

About