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Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN Print: 0276-1459
ISSN Online: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v22.i1.50
pages 79-93

DEVELOPMENT OF A NEW LARGE-FLOW-RATE AND EFFICIENT MIST GENERATOR, AND ITS APPLICATION TO AIR COOLING IN GREENHOUSES

Michio Sadatomi
Department or Advanced Mechanical System, Graduate School of Science and Technology, Kumamoto University, Kurokami 2-39-1, Chuo-Ku, Kumamoto City, 860-8555, Japan
Akimaro Kawahara
Faculty of Advanced Science and Technology, Kumamoto University, Chuo-Ku, Kurokami 2-39-1, Kumamoto City, 860-8555, Japan
Kentarou Fukamachi
Dept. of Mechanical System Engineering, Kumamoto University, Kumamoto, 860-8555
Fuminori Matsuyama
Dept. of Mechanical System Engineering, Kumamoto University, Kumamoto, 860-8555; Dept. of Mechanical Engineering, Sasebo National College of Technology, Sasebo, 857-1193
Naoki Tanaka
Dept. of Mechanical System Engineering, Kumamoto University, Kumamoto, 860-8555

ABSTRACT

A new large-flow-rate mist generator of less energy consumption has been developed in this study. The mist generator is categorized as two-fluid-type, but no water pump is required if pressurized air alone is supplied because water is automatically suctioned by vacuum pressure arising behind a sphere or an orifice in the mist generator. Several types of mist generators with sphere or different orifice sizes, etc. have been produced and tested in order to find the best specifications. In the tests, mist generation rate, air supply rate, and air pressure at the inlet of the mist generator were measured to evaluate the pneumatic power which is needed to select an air source. From the ratio of the mist generation rate to the pneumatic power and the droplet size, the optimum type was determined. Furthermore, as an example of practical uses for the mist generator, air-cooling tests in a greenhouse were conducted in the daytime and evening, in midsummer as well as late fall. The test results in the daytime in midsummer showed that the room temperature in the house fell from 50 to 30C. These test results and the details of the mist generator are reported in this paper.

REFERENCES

  1. Bayvel, L. and Orzechowski, Z., Liquid Atomization.

  2. http://www.lechler.de/uk/main/home/index.shtml.

  3. http://www.bete.com/products/nozzles.html.

  4. http://www.delavan.co.uk/.

  5. http://www.kirinoikeuchi.co.jp/eng/.

  6. http://www.hypro-ind.co.uk/Air_Atomising.htm.

  7. Institute for Liquid Atomization and Spray Systems-Japan Ed., Atomization Technology (in Japanese).

  8. Matsuyama, F., Kanazawa, S., Sadatomi, M., Kawahara, A., and Kano, K., Optimum design of a new micro-bubble generator and its application to industries (Prediction of hydraulic performance at deep water level) (in Japanese). DOI: 10.3811/pmfr.1.25

  9. Matsuyama, F., Sadatomi, M., Kawahara, A., and Fukamachi, K., Development of a large-flow-rate mist generator - Prediction of hydraulic performance (in Japanese).

  10. Nukiyama, S. and Tanasawa, Y., An experiment on the atomization of liquid - 4th Report.

  11. Sadatomi, M., Japanese patent JP 2003-305494-A.

  12. Sadatomi, M., Kawahara, A., Kano, K., and Ohtomo, A., Performance of a new micro-bubble generator with a spherical body in a flowing water tube. DOI: 10.1016/j.expthermflusci.2004.08.006

  13. Sadatomi, M., Kawahara, A., Matsuyama, F., and Kimura, T., An advanced micro-bubble generator and its application to a newly developed bubble-jet-type air-lift pump. DOI: 10.1615/MultScienTechn.v19.i4.20

  14. Sadatomi, M., Matsuyama, F., Kawahara, A., and Fukamachi, K., Development of a large-flow-rate mist generator - Prediction of hydraulic performance. DOI: 10.1115/FEDSM2007-37143

  15. Sadatomi, M. and Murai, E., Japanese pat.

  16. Sadatomi, M. and Kawahara, A., Japanese patent.

  17. Tanno, S., Miura, T., and Ohtani, S., Atomization of high viscosity liquids by pneumatic nozzles.


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