Spray Droplet Characterization from a Single Nozzle by High Speed Image Analysis Using an In-Focus Droplet Criterion

Minov, Sofija Vulgarakis; Cointault, Frédéric; Vangeyte, Jürgen; Pieters, Jan; Nuyttens, David

doi:10.3390/s16020218

Cited by 34 publications

(12 citation statements)

References 29 publications

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“…A conclusion of the previous works showed an effect of variability of working pressure in the Dv 0.5 at a constant nozzle type (Alheidary, (2); Alheidary, (3). The results of this point are agreed with the results of (15,17,18,23) which confirmed effect of the droplet sizes by changing in working pressure. All tests investigated decrease of the droplet size with target distance download increase.…”

Section: Results and Discussion Effect Of Nozzle Type Working Pressusupporting

confidence: 90%

Influence of Nozzle Type, Working Pressure, and Their Interaction on Droplets Quality Using Knapsack Sprayer

Alheidary¹

2019

IQ J Agr Scs

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The present experiment was carried out at the Dept. of Agricultural Machines and Equipment, College of Agriculture, University of Basrah. The aim of the study is to highlight the effect of the nozzle type, working pressure and their interaction onto droplet quality using knapsack sprayer to improve their performance. Droplet characteristics were sampled on white paper cards at different distances from the nozzle. On the samples spray deposits, spray coverage, droplet size, and volume median diameter was measured using BSF tracer with water after their deposit on the sample. The main studied parameters were: Six nozzle types hollow cone, Flat fan ceramic, flat fan ISO, CFA, AirMix and flat fan air induction nozzle. Two working pressures were 15 and 25 psi. All measurements carried out at the same nozzle height of 50cm by using CRD with three replications. The main results of this study showed the best spray deposition and spray coverage with the highest values 0.06nµl.cm -2 and 63% respectively when hollow cone nozzle was compared to other nozzles under the same operating conditions. Whereas, the Flat fan air induction nozzle appeared the most significant droplet size and VMD 377.69 µm and 378 µm respectively when it was compared to the hollow cone and flat fan nozzles.

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Section: Results and Discussion Effect Of Nozzle Type Working Pressusupporting

confidence: 90%

Influence of Nozzle Type, Working Pressure, and Their Interaction on Droplets Quality Using Knapsack Sprayer

Alheidary¹

2019

IQ J Agr Scs

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“…More importantly, data analysis in both LD and PDPA is based on the assumption of spherical droplets, which is never strictly satisfied for a spray process and becomes problematic with increasing droplet size. Imaging-based techniques can overcome all the above limitations by providing high resolution size measurements on a per-drop basis over a large field-of-view from the captured images (Jiang et al, 2010;Minov et al, 2016). However, conventional imaging techniques have limited depth of field, i.e., the depth that the object appears to be in focus, which decreases drastically with increasing magnification.…”

Section: Introductionmentioning

confidence: 99%

Automated droplet size distribution measurements using digital inline holography

Kumar

Hogan

et al. 2019

Journal of Aerosol Science

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Droplet generation through spray breakup is an unsteady and non-linear process which produces a relatively dense, highly polydisperse aerosol containing non-spherical droplets with sizes spanning several orders of magnitude. Such variability in size and shape can lead to significant sources of error for conventional measurements based on laser scattering. Although direct imaging of droplets can potentially overcome these limitations, imaging suffers from a shallow depth of field as well as occlusions, which prevents the complete spray from being analyzed. In comparison, digital inline holography (DIH), a low cost coherent imaging technique, can enable high resolution imaging of the sample over an extended depth of field, typically several orders of magnitude larger than traditional imaging. In this study, we showcase an automated DIH imaging system for characterizing monodisperse and polydisperse aerosol droplet size and shape distributions in the 20 m -3 mm diameter range, over a large sample volume. The high accuracy of the technique is demonstrated by measurements of monodisperse droplets generated by a vibrating orifice droplet generator, achieving a resolution of ~14.2. Measurements of a polydisperse spray from a flat fan nozzle serve to establish the versatility of DIH in extracting a two-dimensional size-eccentricity distribution function, which indicates a strong semilogarithmic scaling between the two parameters that decays as the droplet migrates away from the nozzle. Due to its low cost and compact setup as well as high density of data obtained, DIH can serve as a promising approach for future aerosol characterization.

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“…Whereas, the smallest spray droplets can impact WPCs (Minov et al, 2016;Alheidary, 2019). The results also showed that these properties were significantly affected by the positions of WPCs on the plant.…”

Section: Table (5): the Average And Sd Values Of The Spray Droplet Properties At Different Positions Of The Plant Based On Nozzle Typementioning

confidence: 80%

The Role of Sprayer`s Characteristics and Foliar Spraying for Improving the Maize Growth and Yield

Alheidary¹,

S²,

abdullah³

2020

Basrah J. Agric. Sci.

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: The field experiment was performed during the autumn growing season 2019 in Al Khyoot village of the Qurna town which is located at 75 km northern Basrah city centre. For improving the maize growth and yield, the effect of foliar spraying with iron and zinc and the most important technological characteristics of the knapsack sprayer such as nozzle types was studied. Three nozzle types were investigated as standard Flat fan nozzle, Hollow cone nozzle, and Tip nozzle (as reference nozzle in this study). Three foliar concentrations (0, Zn30 + Fe100 and Fe100+ Zn30) as well as a 16- litre capacity of the knapsack sprayer were used for fertilizer spraying experiments. All field experiments were carried out using the complete randomized block design (RCBD) with three replications. The results of the statistical analysis showed that there was a significant effect of the nozzle type and foliar spraying on the plant growth and yield characteristics as plant height, stem diameter, number of leaves, leaf area, number of grains, and yields (152.39 cm, 1.88 cm, 13.98, 4559 cm2, 376.51 and 5.51 Mg ha-1 respectively). Also, these characteristics showed an increase percentage as following (2.79%, 2.25%, 0.60%, 3.11%, 3.70%, and 1.73% respectively) when the hollow cone nozzle was used compared to the reference nozzle. In addition, an interaction between the studied factors also appeared a significant difference in the grain number and yield characteristics.

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Spray Droplet Characterization from a Single Nozzle by High Speed Image Analysis Using an In-Focus Droplet Criterion

Cited by 34 publications

References 29 publications

Influence of Nozzle Type, Working Pressure, and Their Interaction on Droplets Quality Using Knapsack Sprayer

Influence of Nozzle Type, Working Pressure, and Their Interaction on Droplets Quality Using Knapsack Sprayer

Automated droplet size distribution measurements using digital inline holography

The Role of Sprayer`s Characteristics and Foliar Spraying for Improving the Maize Growth and Yield

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