Browse > Article
http://dx.doi.org/10.5307/JBE.2002.27.4.317

Improvement of the Efficiency of a Twin-fluid Nozzle using Ultrasonic Vibration  

주은선 (Professor, School of Transport Vehicle Engineering ＆ Research Center for Aircraft Parts Technology)
나우정 (Professor, School of Agri-Systems Engineering and Institute of Agriculture ＆ Life Sciences, Gyeongsang National University, Jinju, Korea)
정진도 (Assistant Professor, Dept. of Environmental Engineering, Hoseo Univ., Asan, Chungnam)
송민근 (School of Transport Vehicle Engng)
이경열 (School of Agri-systems. Engng., Gyeongsang National University)
Publication Information
Journal of Biosystems Engineering / v.27, no.4, 2002 , pp. 317-326 More about this Journal
Abstract
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.
Keywords
Twin-fluid Nozzle; Ultrasonic; Spray Droplet; Atomization;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Druoughton, J. V. 1984. The effect of ultrasonic mixing of fuel and air on the performance of an internal combustion engine. SAE 840238.
2 Kim, M. K. 1994. A fundamental study on the development of cold fog machine. Ph. D. thesis, Gyeongsang Nat'I Univ., Korea. (In Korean)
3 千葉 近. 1972. 超音波にのる液體の微粒化の硏究. 內燃機關. 11(2):11-22.
4 Ryu. J. I. 1987. A study on the atomization performance of suction fuel using ultrasonic vibration. Reports of the Research Institute of Industrial Technology, Chungnam National University 2(1):46-54(In Korean).
5 Mullinger, P. J. and N. A. Chigier. 1974. The design and performance of internal mixing multijet twin-fluid atomizers. J. Inst. of Fuel. pp. 251-261.
6 이상용. 1996. 액체의 미립화. (주)민음사. pp. 209-220.
7 Berger. H. L. 1985. Characterization of a class of widely applicable ultrasonic nozzles. Proc. 3rd International Conference on Liquid Atomization and Spray Systems (ICLASS-85). pp.1A/2/1-1A/2/13.
8 Sargeant, M. 1982. Blast atomizer developments in the Central Electricity Generating Board. Proc. 2nd International Conference on Liquid Atomization and Spray Systems (ICLASS-82). pp. 131-136.
9 Niemczewski. B. 1980. A comparison of ultrasonic cavitation intensity in liquids. Ultrasonics. May. pp. 107-110.   DOI   ScienceOn
10 Lefebvre. H. 1989. Atomization and Spray. Hemisphere Publishing Corporation. pp. 90-91.
11 Ju. E. S., J. D. Chung and M. G. Song. 1998. A study on ultrasonic effects for the atomization in a twin-fluid spray. Journal of ILASS-Korea 3(4):50-57. (In Korean)   과학기술학회마을
12 Bryce, W. B., N. W. Cox and W. I. Joyce. 1978. Oil droplet production and measurement from a twin-fluid atomizer using real fluids. Proc. 1 st International Conference on Liquid Atomization and Spray Systems (ICLASS-78). pp. 259-263.
13 Jasuja, A. K. 1979. Atomization of crude and residual fuel oils. Trans. ASME, J. Eng. for Power 101 :250-258.   DOI
14 藤森聰雄. 1980. やさしい超音波の應用. 東京大學. 生産技術硏究所. 産報出版. pp. 22-23
15 Hurley, J. F. and B. W. Doyle. 1985. Design of two-phase atomizers for use in combustion furnaces. Proc. 3rd. International Conference on Liquid Atomization and Spray Systems (ICLASS-85). pp. IA/3/1-IA/3/13.
16 Mochida. T. 1978. Ultrasonic atomization of liquids. Proc. 1st International Conference on Liquid Atomization and Sprays(lCLAS-78). pp. 193-200.