SPECTRUM AND VELOCITY OF DROPLETS OF SPRAY NOZZLES WITH AND WITHOUT AIR INDUCTION

França, Jorge A. L.; Cunha, João P. A. R. da; Antuniassi, Ulisses R.

doi:10.1590/1809-4430-Eng.Agric.v38n2p232-237/2018

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Sumário

Scientific Paper, Agricultural Machinery Management • Eng. agríc. (Online) 38 (2) • Mar-Apr 2018 • https://doi.org/10.1590/1809-4430-Eng.Agric.v38n2p232-237/2018 copy

SPECTRUM AND VELOCITY OF DROPLETS OF SPRAY NOZZLES WITH AND WITHOUT AIR INDUCTION

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The aim of this study was to evaluate the spectrum and the velocity of droplets produced by nozzles with and without air induction, under different pressures and flow rates. The experiment was conducted in a completely randomized design with five replications, in a factorial 2 x 3 x 3 (two spray nozzles, three flow rates and three operating pressures). The spray nozzles with and without air induction of the Hypro manufacturer (GA and VP) were evaluated, with nominal flow rates of 0.76; 1.14 and 1.51 L min^-1 and pressures of 200, 300 and 400 kPa. The spectrum and velocity of the droplets were determined directly, using a Visisize Portable P15 (Oxford Lasers, Imaging Division). The pressure increases further reduction of the VMD and the relative amplitude, and increases the droplet velocity. The droplets generated by the spray nozzles with air induction showed on average amplitude 1.54 times higher than the droplets generated by spray nozzles without air induction. The droplet velocity showed little variation between the nozzles with and without air induction with the same pressure and flow rate, however, spray nozzles with larger flow rates and pressures produced droplets with higher velocities.

KEYWORDS
spray drift; droplet size; application technology of pesticides

Manufacture	Model	Flow rate (L min^-1)	Characteristic
Hypro	VP 110-02	0.76	Without air induction
	VP 110-03	1.14
	VP 110-04	1.52
	GA 110-02	0.76	With air induction
	GA 110-03	1.14
	GA 110-03	1.52

Source of variation	Calculated F value
Source of variation	VMD	RA	Velocity
Nozzle	3811.202^ significant at 0.01,	3562.219^ significant at 0.01,	0.000^ns ns not significant at 0.05.
Flow rate	170.030^ significant at 0.01,	39.007^ significant at 0.01,	186.624^ significant at 0.01,
Pressure	703.680^ significant at 0.01,	382.762^ significant at 0.01,	48.472^ significant at 0.01,
Nozzle x Flow rate	91.242^ significant at 0.01,	39.996^ significant at 0.01,	5.843^ significant at 0.01,
Nozzle x Pressure	333.119^ significant at 0.01,	75.754^ significant at 0.01,	0.883^ns ns not significant at 0.05.
Flow rate x Pressure	63.253^ significant at 0.01,	36.938^ significant at 0.01,	2.747^* * significant at 0.05;
Nozzle x Flow rate x Pressure	39.494^ significant at 0.01,	15.506^ significant at 0.01,	0.613^ns ns not significant at 0.05.
CV. (%)	3.69	3.40	7.88

Flow rate (L min^-1)	Pressure (kPa)	VMD (µm)
		Nozzle
		VP	GA
0.76	200	153.74 b	277.86 a
	300	142.46 b	228.74 a
	400	134.42 b	203.00 a
1.14	200	142.48 b	241.84 a
	300	134.06 b	184.66 a
	400	128.58 b	168.56 a
1.52	200	158.82 b	355.32 a
	300	138.76 b	224.42 a
	400	130.72 b	179.90 a
CV./F_LEVENE/K-S		3.69/4.211/0.079

Flow rate (L min^-1)	Pressure (kPa)	RA
		Nozzle
		VP	GA
0.76	200	1.05 a	1.55 b
	300	0.96 a	1.63 b
	400	0.92 a	1.42 b
1.14	200	1.11 a	1.87 b
	300	0.92 a	1.64 b
	400	0.88 a	1.24 b
1.52	200	1.11 a	1.62 b
	300	0.93 a	1.41 b
	400	0.88 a	1.15 b
CV./F_LEVENE/K-S		3.40/2.208/0.100

Nozzle	Pressure (kPa)	VMD (µm)
		Flow rate (L min^-1)
		0.76	1.14	1.52
GA	200	277.86 b A	241.84 c A	355.32 a A
	300	228.74 a B	184.66 b B	224.42 a B
	400	203.00 a C	168.56 c C	179.90 b C
VP	200	153.74 a A	142.48 b A	158.82 a A
	300	142.46 a B	134.06 a AB	138.76 a B
	400	134.42 a B	128.58 a B	130.72 a B
CV./F_LEVENE/K-S		3.69/4.211/0.079

Nozzle	Pressure (kPa)	RA
		Flow rate (L min^-1)
		0.76	1.14	1.52
GA	200	1.55 a B	1.87 c C	1.62 b C
	300	1.63 b C	1.64 b B	1.41 a B
	400	1.42 c A	1.24 b A	1.15 a A
VP	200	1.05 a B	1.11 a B	1.11 a B
	300	0.96 a A	0.92 a A	0.93 a A
	400	0.92 a A	0.88 a A	0.88 a A
CV./F_LEVENE/K-S		3.40/2.208/0.100

Flow rate (L min^-1)	Velocity (m s^-1)
	Nozzle
	VP	GA
0.76	1.88 a B	1.94 a C
1.14	2.74 a A	2.55 b B
1.52	2.76 a A	2.86 a A
CV./F_LEVENE/K-S	7.880/3.342/0.137

Pressure (kPa)	Velocity (m s^-1)
	Flow rate (L min^-1)
	0.76	1.14	1.52
200	1.73 b B	2.42 a B	2.43 a C
300	1.93 c AB	2.69 b A	2.90 a B
400	2.07 c A	2.83 b A	3.13 a A
CV./F_LEVENE/K-S	7.880/3.342/0.137

Associação Brasileira de Engenharia Agrícola SBEA - Associação Brasileira de Engenharia Agrícola, Departamento de Engenharia e Ciências Exatas FCAV/UNESP, Prof. Paulo Donato Castellane, km 5, 14884.900 | Jaboticabal - SP, Tel./Fax: +55 16 3209 7619 - Jaboticabal - SP - Brazil
E-mail: revistasbea@sbea.org.br

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[1] * Corresponding author. Universidade Federal de Uberlândia/Uberlândia - MG, Brasil. E-mail: jorge.10.franca@gmail.com