Produção e utilização de gotas com diâmetro uniforme

Corrêa, Hermes Geraldo; Held, José de

doi:10.1590/S0006-87051982000100001

Resumos

A execução da pesquisa com freqüência requer o desenvolvimento de aparelhagem específica. Para estudo dos parâmetros das populações de gotas produzidas por pulverizadores é necessário conhecer o fator de espalhamento de diversas formulações sobre superfícies de amostragem (papel kromekote, melamina (fórmica), vidro etc.). Essa determinação requer aparelhagem geradora de gotas com diâmetro uniforme. Com este objetivo principal, realizou-se o presente trabalho. Além de sua utilização para investigar o comportamento físico da pulverização, o aparelho poderá ter outras aplicações no campo da biologia, como a distribuição uniforme de esporos em dose determinada sobre superfícies vegetais, permitindo, também, observações sobre o efeito tóxico de determinadas doses de defensivos sobre vegetais e animais. O aparelho produziu gotas com diâmetro que, em média, apresentaram coeficiente de variação de 2,36%. o fator de espalhamento para solução aquosa de rodamina a 0,2% sobre papel kromekote apresentou a variação de 1,32 a 1,71 quando se usaram, respectivamente, gotas entre 98 e 325 micra. Para Malathion a 96% de principio ativo, sobre papel kromekote, as gotículas apresentaram fatores de espalhamento variando de 4,09 a 5,18 quando se utilizaram gotas entre 80 e 217 micra. A melamina branca (fórmica) apresentou menores variações nesse fator quando lhe foi aplicado o Malathion.

This paper deals with the construction and use of a spinning disc atomizer that produces uniformly sized droplets. The device has a special use in the determination of the spread factor on several sampling surfaces (Kromekote paper, glass, plastic etc.). Furthermore, it permits the study of spraying performance, the inoculation of known spore doses of fungi and observations about toxical effects of pesticides on vegetables and animals. The apparatus showed a narrow droplet size spectrum, with a coefficient of variation about 2.36%. The spread factor of rodhamine B 0.2% in water solution showed to be of 1.32 and 1.71, respectively, when droplets of 98 and 325 micra were used, on Kromekote paper. With Malathion, 96% of active ingredient, the spread factors on Kromekote paper were 4.09 and 5.18 when droplets of 80 and 217 micra were spread. Melamine (Fórmica) showed a small variation in spread factor when sprayed with Malathion.

ARTIGOS

Produção e utilização de gotas com diâmetro uniforme

The generation and use of uniformly sized droplets

Hermes Geraldo Corrêa; José de Held

Seção de Máquinas de Implantação de Culturas e Aplicadoras de Defensivos, Instituto Agronômico, IAC

RESUMO

A execução da pesquisa com freqüência requer o desenvolvimento de aparelhagem específica. Para estudo dos parâmetros das populações de gotas produzidas por pulverizadores é necessário conhecer o fator de espalhamento de diversas formulações sobre superfícies de amostragem (papel kromekote, melamina (fórmica), vidro etc.). Essa determinação requer aparelhagem geradora de gotas com diâmetro uniforme. Com este objetivo principal, realizou-se o presente trabalho. Além de sua utilização para investigar o comportamento físico da pulverização, o aparelho poderá ter outras aplicações no campo da biologia, como a distribuição uniforme de esporos em dose determinada sobre superfícies vegetais, permitindo, também, observações sobre o efeito tóxico de determinadas doses de defensivos sobre vegetais e animais. O aparelho produziu gotas com diâmetro que, em média, apresentaram coeficiente de variação de 2,36%. o fator de espalhamento para solução aquosa de rodamina a 0,2% sobre papel kromekote apresentou a variação de 1,32 a 1,71 quando se usaram, respectivamente, gotas entre 98 e 325 micra. Para Malathion a 96% de principio ativo, sobre papel kromekote, as gotículas apresentaram fatores de espalhamento variando de 4,09 a 5,18 quando se utilizaram gotas entre 80 e 217 micra. A melamina branca (fórmica) apresentou menores variações nesse fator quando lhe foi aplicado o Malathion.

SUMMARY

This paper deals with the construction and use of a spinning disc atomizer that produces uniformly sized droplets.

The device has a special use in the determination of the spread factor on several sampling surfaces (Kromekote paper, glass, plastic etc.).

Furthermore, it permits the study of spraying performance, the inoculation of known spore doses of fungi and observations about toxical effects of pesticides on vegetables and animals.

The apparatus showed a narrow droplet size spectrum, with a coefficient of variation about 2.36%.

The spread factor of rodhamine B 0.2% in water solution showed to be of 1.32 and 1.71, respectively, when droplets of 98 and 325 micra were used, on Kromekote paper.

With Malathion, 96% of active ingredient, the spread factors on Kromekote paper were 4.09 and 5.18 when droplets of 80 and 217 micra were spread.

Melamine (Fórmica) showed a small variation in spread factor when sprayed with Malathion.

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

Recebido para publicação a 17 de março de 1980.

1. BOUSE, L. F. Use of pulsed jets to atomize various liquids. Transactions of the ASAE, 18:618-622, 1975.
2. BRAZZEL, J. R.; WATSON, W. W.; HURSH, J. S.; ADAIR, M. H. The relative efficiency of aerial application of ultra-low-volume and emulsifiable concentrate formulations of insecticides. Journal of Economic Entomology, 61(2):408-413. 1968.
3. BURT, E. C. & SMITH, D. B. Effects of droplets size on deposition of ULV spray. Journal of Economic Entomology, 67(6):751-754, 1974.
4. ^__________ ; ^__________; LLOYD, E. P. A rotary disc device for applying ultra-low-volume (undiluted) pesticides with ground equipment. Journal of Economic Entomology, 59(6):1487-1489, 1966.
5. COURSHEE. R. J. A laboratory applicator for pesticides. Agricultural and Veterinary Chemicals, 1(34), 1960.
6. DABORA, E. K. Production of monodisperse sprays. Review of Scientific Instruments, 38(4):502-506, 1967.
7. DIMMOCK, N. A. Production of uniform droplets. Nature, 166:686, 1950.
8. ENNIS JR., W. B. & WILLIANSON, R. E. Influence of droplet size on effectiveness of low-volume herbicidal sprays. Weeds, 11(1):67-72, 1963.
9. HIMEL, C. M. The fluorescent particle spray droplet tracer method. Journal of Economic Entomology, 62(4) :912-916, 1969.
10. HOUGHTON, H. G. Chemical engineers handbook. 2.ed. New York, McGraw-Hill, 1941. 1948p.
11. ISLER, D. A. Atomatization of low-volume Malathion aerial spray. Journal of Economic Entomology, 59(3):688-690, 1966.
12. KING, W .J. & JOHNSTONE, D. R. A modified microburette for the production of very small liquid droplets. COPR Salisbury Inglaterra, 1971. 6p. (Miscellaneous Report, 1)
13. MARGARVEY, R. H. & TAYLOR, B. W. Apparatus for the production of large water drops. Review of Scientific Instruments, 27(11):944-947, 1956.
14. MASON, B. J.; JAYARATNE, O. W.; WOODS, J. D. An improved vibrating capillary device for producing uniform water droplets of 15-500 um radius. Journal of Scientific Instruments, 40:247-249, 1963.
15. MAY, K. R. An improved spinning top homogeneous spray apparatus. Journal of Applied Physics, 20:932-938, 1949.
16. ^__________ The measurement of airbone droplets by the magnesium oxide method. Journal of Scientific Instruments, 27:128-130, 1950.
17. ^__________ Spinning top homogeneous aerosol generator with shockproof mounting. Journal of Scientific Instruments, 43:841-842, 1966.
18. POLLES, S. G. & VINSON, S. B. Effect of droplet size on persistence of ULV malathion and comparison of toxicity of ULV and E. C. Malathion to tobacco budworm larvae. Journal of Economic Entomology, 62(1) :89-94, 1969.
19. RAYNER, A. C. & HALIBURTON, W. M. Rotary device for producing a stream of uniform drops. Review of Scientific Instruments, 26(12):1124-1127, 1955.
20. ROTH, L. O. & PORTERFIELD, J. G. Spray drops size control. Transactions Of the ASAE, 13(6):779-781, 784, 1970.
21. SMITH, D. B. & BURT, E. G. Design of a spinning disc droplet separator and the determination of the size and density of droplets deposited on cotto foliage. Transactions of the ASAE, 13:664-668, 1970.
22. ^__________; ^__________; BENCI, F. J. Effects of the size of ULV droplets on deposits within cotton foliage both inside and immediately downwind from a treated swath. Journal of Economic Entomology, 63(5):1400-1405, 1970.
23. STROM, L. The generation of monodisperse aerosols by means of a disintegrated jet of liquid. Review of Scientific Instruments, 40(6) :778-782, 1969.
24. WALTON, W. H. & PREWETT, W. C The production of sprays and mist of uniform droplets size by means of spinning disc type sprayers. Proceedings of the Physical Society, 62(6):341-350, 1949.
25. WOLF, R. W. Study of the vibrating reed in the production of small droplets and solid particles of uniform size. Review of Scientific Instruments, 32:1124-1129, 1961.
26. YATES, E. W.; AKESSON, N. B.; COUTTS, H. H. Evaluation of drift residues from aerial applications. Transactions of the ASAE, 9(3) :389-393, 397, 1966.

Datas de Publicação

Publicação nesta coleção
17 Dez 2007
Data do Fascículo
1982

Histórico

Recebido
17 Mar 1980

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

[1] 1. BOUSE, L. F. Use of pulsed jets to atomize various liquids. Transactions of the ASAE, 18:618-622, 1975.

[2] 2. BRAZZEL, J. R.; WATSON, W. W.; HURSH, J. S.; ADAIR, M. H. The relative efficiency of aerial application of ultra-low-volume and emulsifiable concentrate formulations of insecticides. Journal of Economic Entomology, 61(2):408-413. 1968.

[3] 3. BURT, E. C. & SMITH, D. B. Effects of droplets size on deposition of ULV spray. Journal of Economic Entomology, 67(6):751-754, 1974.

[4] 4. ^__________ ; ^__________; LLOYD, E. P. A rotary disc device for applying ultra-low-volume (undiluted) pesticides with ground equipment. Journal of Economic Entomology, 59(6):1487-1489, 1966.

[5] 5. COURSHEE. R. J. A laboratory applicator for pesticides. Agricultural and Veterinary Chemicals, 1(34), 1960.

[6] 6. DABORA, E. K. Production of monodisperse sprays. Review of Scientific Instruments, 38(4):502-506, 1967.

[7] 7. DIMMOCK, N. A. Production of uniform droplets. Nature, 166:686, 1950.

[8] 8. ENNIS JR., W. B. & WILLIANSON, R. E. Influence of droplet size on effectiveness of low-volume herbicidal sprays. Weeds, 11(1):67-72, 1963.

[9] 9. HIMEL, C. M. The fluorescent particle spray droplet tracer method. Journal of Economic Entomology, 62(4) :912-916, 1969.

[10] 10. HOUGHTON, H. G. Chemical engineers handbook. 2.ed. New York, McGraw-Hill, 1941. 1948p.

[11] 11. ISLER, D. A. Atomatization of low-volume Malathion aerial spray. Journal of Economic Entomology, 59(3):688-690, 1966.

[12] 12. KING, W .J. & JOHNSTONE, D. R. A modified microburette for the production of very small liquid droplets. COPR Salisbury Inglaterra, 1971. 6p. (Miscellaneous Report, 1)

[13] 13. MARGARVEY, R. H. & TAYLOR, B. W. Apparatus for the production of large water drops. Review of Scientific Instruments, 27(11):944-947, 1956.

[14] 14. MASON, B. J.; JAYARATNE, O. W.; WOODS, J. D. An improved vibrating capillary device for producing uniform water droplets of 15-500 um radius. Journal of Scientific Instruments, 40:247-249, 1963.

[15] 15. MAY, K. R. An improved spinning top homogeneous spray apparatus. Journal of Applied Physics, 20:932-938, 1949.

[16] 16. ^__________ The measurement of airbone droplets by the magnesium oxide method. Journal of Scientific Instruments, 27:128-130, 1950.

[17] 17. ^__________ Spinning top homogeneous aerosol generator with shockproof mounting. Journal of Scientific Instruments, 43:841-842, 1966.

[18] 18. POLLES, S. G. & VINSON, S. B. Effect of droplet size on persistence of ULV malathion and comparison of toxicity of ULV and E. C. Malathion to tobacco budworm larvae. Journal of Economic Entomology, 62(1) :89-94, 1969.

[19] 19. RAYNER, A. C. & HALIBURTON, W. M. Rotary device for producing a stream of uniform drops. Review of Scientific Instruments, 26(12):1124-1127, 1955.

[20] 20. ROTH, L. O. & PORTERFIELD, J. G. Spray drops size control. Transactions Of the ASAE, 13(6):779-781, 784, 1970.

[21] 21. SMITH, D. B. & BURT, E. G. Design of a spinning disc droplet separator and the determination of the size and density of droplets deposited on cotto foliage. Transactions of the ASAE, 13:664-668, 1970.

[22] 22. ^__________; ^__________; BENCI, F. J. Effects of the size of ULV droplets on deposits within cotton foliage both inside and immediately downwind from a treated swath. Journal of Economic Entomology, 63(5):1400-1405, 1970.

[23] 23. STROM, L. The generation of monodisperse aerosols by means of a disintegrated jet of liquid. Review of Scientific Instruments, 40(6) :778-782, 1969.

[24] 24. WALTON, W. H. & PREWETT, W. C The production of sprays and mist of uniform droplets size by means of spinning disc type sprayers. Proceedings of the Physical Society, 62(6):341-350, 1949.

[25] 25. WOLF, R. W. Study of the vibrating reed in the production of small droplets and solid particles of uniform size. Review of Scientific Instruments, 32:1124-1129, 1961.

[26] 26. YATES, E. W.; AKESSON, N. B.; COUTTS, H. H. Evaluation of drift residues from aerial applications. Transactions of the ASAE, 9(3) :389-393, 397, 1966.

Brasil

Brasil

Produção e utilização de gotas com diâmetro uniforme

The generation and use of uniformly sized droplets

Resumos

Datas de Publicação

Histórico