• Proceedings of the KSME Conference
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• 2002.08a
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• pp.299-302
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• 2002

Characteristics of the twin fluid spray with ultrasonic forcing are examined in order to obtain the high efficiency of cold fog spray of the automatic pest control machine which has been widely used for the equipment cultivation recently. An electrostrictive vibrator of PZT BLT and a magnetostrictive vibrator of ${\pi}type$ with 28 kHz are applied as the ultrasonic transducer. All experiments are made and observed in 4 methods of spray ; a conventional spray method without ultrasonic forcing, an indirect vibration method with ultrasonic forcing, an improving duality method by ultrasonic forced within liquid, and a combined use method with both of the indirect vibration method and the improving quality method. In results, It was clarified that the ultrasonic effects the atomization of spray droplets and its efficiency is about $10{\%}$ and especially much more in the case of the combined use method.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.02a
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• pp.423-428
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• 2003

2-유체 노즐은 연료와 농약액에 응용되는 경우에는 공기와 쉽게 혼합되고 미세한 분무입자를 얻을 수 있어서 매우 유용하다(이상용, 1996). 특히 2-유체 상온 연무노즐은 온실 내에 사용하기에 다른 방식보다 유용한 점이 많아 널리 보급되어 있다. 최근 국내에서는 시설재배가 계속 확대 보급되고 있는 바 이에 상응하는 고효율 방제를 위한 고효율 분무노즐 개발은 필수적이다(Kim,1994). 2-유체노즐은 Bryce (1978), Mullinger(1974), Hurley(1985) 등 많은 연구자에 의해 공기의 보조 및 충돌식 등으로 설계되고 개량되어 왔다. (중략)

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.02a
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• pp.429-433
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• 2003

온실 내 병충해 방제에 사용하는 상용 연무기에 비해 보다 미세하고 균일한 분무입자를 생성하여 작물에의 부착을 용이하게 할 목적으로 초음파를 적용한 상용 연무기용 2-유체 노즐을 설계, 제작하고 이를 적용한 온실에서의 분무실험을 통하여 부착량과 부착입경을 측정하고 상용분무의 경우의 결과와 비교하여 초음파의 분무특성에 미치는 영향을 분석하였다. (중략)

• Journal of Biosystems Engineering
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• v.27 no.4
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• pp.317-326
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• 2002

Characteristics of a twin-fluid spray with ultrasonic vibration were examined in order to obtain a high efficiency of cold-fog spray of the automatic pest control machine which has been widely used in protected horticulture recently. An electrostrictive vibrator of PZT BLT and a magnetostrictive $\pi$-type vibrator were used applied as the ultrasonic transducers with a frequency of 28 kHz. All experiments were conducted in 4 methods of spray ; a conventional spray method without ultrasonic forcing, an indirect vibration method with ultrasonic forcing, an improving-quality method by ultrasonic forced within liquid, and a combined-use method with both of the indirect vibration method and the improving quality method. It was found that the ultrasonic energy increased the atomization efficiency of spray droplets about 10% and especially much more in the case of the combined-use method.