DOI QR코드

DOI QR Code

STUDY ON THE PERFORMANCE OF THE SHAPE OF THE AIR-LIQUID EJECTOR DIFFUSER

기체-액체 이젝터의 디퓨저 형상에 대한 연구

  • Jang, Jin-Woo (Graduate school, Department of Mechanical Engineering, DongA University) ;
  • Sin, Won-Hyeop (Graduate school, Department of Mechanical Engineering, DongA University) ;
  • Park, Young-Chul (Department of Mechanical Engineering, DongA University)
  • 장진우 (동아대학교 대학원 기계공학과) ;
  • 신원협 (동아대학교 대학원 기계공학과) ;
  • 박영철 (동아대학교 기계공학과)
  • Received : 2014.10.14
  • Accepted : 2014.11.06
  • Published : 2014.11.30

Abstract

This paper performed a numerical study of an air-liquid ejector. An ejector is a fluid-transportation device that spouts high-pressure fluid from driving pipes using the kinetic energy of the spouted fluid and increases the pressure through the exchange of momentum with the surrounding gases of the lower pressure. The air-liquid ejector was investigated through steady three-dimensional multiphase CFD analysis using commercial software ANSYS-CFX 14.0. Water as the primary fluid is driven through the driving nozzle and air is ejected as the second gas instead of ozone in real applications. The difference in performance according to the shape of the diffuser of the ejector was examined. The results provide deep insight into the influence of various factors on the performance of the air-liquid ejector. The proposed numerical model will be very helpful for further design optimization of the air-liquid ejectors.

본 논문은 기체-액체 이젝터의 수치해석연구에 초점을 맞추고 있다. 이젝터는 구동유체가 노즐을 통해 고속으로 분출될 때, 구동노즐 출구 주변에 진공압이 형성되어 주변의 기체와 운동량 교환을 통하여 저압의 유체를 보다 높은 압력으로 압축하여 수송하는 장치이다. 기체-액체 이젝터는 상용 소프트웨어 ANSYS-CFX 14.0을 사용하여 다상의 CFD 분석을 통해 연구한다. 구동유체는 물을 사용하여 구동되며, 실제로는 공기가 아닌 오존을 사용하여 배출 된다. 기체-액체 이젝터의 디퓨저의 형상에 따라 성능 차이를 비교한다. 결과 기체-액체 이젝터의 성능에 미치는 다양한 요인을 제공 한다. 그리고 제안 된 수치 모델은 기체-액체 이젝터의의 최적 설계에 매우 도움이 될 것다.

Keywords

References

  1. Keenan, J. H., Neumann, E. P. and Lustwerk, F.(1950), An Investigation of Ejector Design by Analysis and Experiment, Journal of Applied Mechanics, Vol.17, No.3, pp.299-309.
  2. Takashima, Y.(1952), Studies on Liguid Jet Gas Pumps, Journal Scientific Research Institute(Tokyo), Vol.46, pp.230-246.
  3. Bonnington, S. T., and King, A. L.(1972), Jet pumps and Ejectors, A State of the Art Review and Bibliography. Published by BHRA Fluid Engineering.
  4. Zahradnik, J., Fialova, M., Linek, V., Sinkule, J., Reznickova and J. Kastanek, F.,1997, "Dispersion efficiency of ejectortype gas distributors in different operating modes", Chem. Eng. Science, Vol. 52, No. 24, pp. 4499-4510. DOI: http://dx.doi.org/10.1016/S0009-2509(97)00294-7
  5. Havelka, P., Linek, V., Sinkule, J., Zahradnik, J. and Fialova, M., 1997, "Effect of the ejector configuration on the gas suction rate and gas hold-up in ejector loop reactors", Chem. Eng. Science, Vol. 52, No. 11, pp. 1701-1713. DOI: http://dx.doi.org/10.1016/S0009-2509(97)00003-1
  6. Rahman, F., Umesh, D. B., Subbarao, D. and Ramasamy, M., 2010, "Enhancement of entrainment rates in liquid-gas ejectors", Chem. Eng. Processing., Vol. 49, pp. 1128-1135. DOI: http://dx.doi.org/10.1016/j.cep.2010.08.014
  7. Kandakure, M. T., Gaikar, V. G. and Patwardhan, A.W., 2005, "Hydrodynamic aspects of ejectors", Chem. Eng. Science, Vol. 60, pp. 6391-6402. DOI: http://dx.doi.org/10.1016/j.ces.2005.04.055
  8. Yadav, R. L., Patwardhan, A. W., 2008, "Design aspects of ejectors: effects of suction chamber geometries", Chem. Eng. Science, Vol. 63, pp. 3886-3897. DOI: http://dx.doi.org/10.1016/j.ces.2008.04.012
  9. Utomo, T., Jin, Z., Rahman, M., Jeong, H. and Chung, H., 2008, "Investigation on hydrodynamics and mass transfer characteristics of a gas-liquid ejector using threedimensional CFD modeling", Journal of Mechanical Science and Technology, Vol. 22, pp. 1821-1829. DOI: http://dx.doi.org/10.1007/s12206-008-0614-3
  10. Myoung Kuk Ji, A Parametric study on the Performance Characteristics of Air and Liquid Ejector, A doctor's thesis, Gyeongsang National University (2008)
  11. Ji-Hoon Jung, A Study of Flow Characteristics inside of ejector, A master's thesis, Dong-A University (2010)