Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Mixed Flow Characteristics of Aeration Process for Recirculation Aquaculture System Using Ejector

이젝터를 이용한 순환양식 시스템 폭기공정의 혼합유동 특성

  • Park, Sang Kyoo (School of Mechanical Design Engineering, Chonnam Nat'l Univ.) ;
  • Yang, Hei Cheon (School of Mechanical Design Engineering, Chonnam Nat'l Univ.)
  • 박상규 (전남대학교 기계설계공학부) ;
  • 양희천 (전남대학교 기계설계공학부)
  • Received : 2013.05.16
  • Accepted : 2013.07.17
  • Published : 2013.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

The objective of this study is to experimentally investigate the mixed flow and oxygen transfer characteristics of a horizontally injected aeration process using an annular nozzle ejector. The flow rate ratio, pressure ratio and ejector efficiency are calculated using the measured flow rate and pressure with the experimental parameters of the ejector pitch and primary flow rate. The visualization images of mixed flow issuing from the ejector are analyzed qualitatively, and the volumetric oxygen transfer coefficients are calculated using the measured dissolved oxygen concentration. The mixed flow behaves like a buoyancy jet or horizontal jet owing to the momentum of primary flow and air bubble size. The buoyancy force of the air bubble and the penetration of mixed flow are found to be important parameters for the oxygen transfer rate owing to the contact area and time of two phases.

본 연구는 환형 노즐 이젝터를 이용하여 수평방향 폭기공정의 혼합유동 및 산소전달 특성에 대한 실험적 연구를 목표로 한다. 실험변수는 이젝터 피치와 가압수 유량이며, 측정된 유량과 압력을 이용하여 유량비, 수두비 및 효율을 계산하였다. 이적터에서 분출된 혼합유동의 가시화를 통해 정성적 거동을 고찰하였으며, 용존산소량을 측정하여 총괄 산소전달계수를 도출하였다. 이젝터에서 분출된 혼합유동은 가압수의 운동량과 유입된 공기기포의 미립화에 따라 부력분류 또는 수평분류의 거동을 나타내었다. 기포의 크기에 기인하는 부력과 가압수의 운동량에 지배되는 혼합유동의 도달거리는 가압수와 공기기포의 접촉 면적 및 시간에 크게 영향을 미치기 때문에 산소전달률의 중요한 변수임을 유추할 수 있다.

Keywords

References

  1. Summerfelt, S. T. and Sharrer, M. J., 2004, "Design Implication of Carbon Dioxide Production within Biofilters Contained in Recirculating Salmonid Culture Systems," Aquacultural Engineering, Vol. 32, pp. 171-182. https://doi.org/10.1016/j.aquaeng.2004.03.006
  2. Summerfelt, S. T., Vinci, B. J. and Piedrahita, R. H., 2000, "Oxygenation and Carbon Dioxide Control in Water Reuse Systems," Aquacultural Engineering, Vol. 22, pp. 87-108. https://doi.org/10.1016/S0144-8609(00)00034-0
  3. Barrut, B., Blancheton, J. P., Champagne, J. Y. and Grasmick, A., 2012, "Mass Transfer Efficiency of a Vacuum Airlift - Application to Water Recycling in Aquaculture Systems," Aquaculture Engineering, Vol. 46, pp. 18-26. https://doi.org/10.1016/j.aquaeng.2011.10.004
  4. EL-Ghandour, M., EL-Sawaf, I. A. and EL-Ottla, F. M., 2001, "Solid-Materials-Handling Central-Type Jet Pump," 6th Int. Water Tech. Conference, IWTC 2001, Alexandria, Egypt, pp. 328-340.
  5. Lima Neto, I. E., 2011, "Maximum Suction Lift of Water Jet Pumps," J. of Mechanical Science and Technology, Vol. 25, pp. 391-394. https://doi.org/10.1007/s12206-010-1221-7
  6. Yang, H. C., Jung, S. W. and Park, S. K., 2009, "Performance Characteristics of Ejector System for Aeration," Proceedings of the KSME 2009 Fall Annual Meeting, pp. 2458-2462.
  7. Du, H., Jang, D. H., Kim, D. J. and Yang, H. C., 2012, "Experimental Study of Oxygen Transfer Characteristics in an Aeration System Using an Annular Nozzle Ejectors," Proceedings of the KSME 2012 Fall Annual Meeting, pp. 2926-2931.
  8. Park, S. K. and Yang, H. C., 2013, "Flow and Oxygen Transfer Characteristics in an Aeration System Using an Annular Nozzle Ejectors," Industrial & Engineering Chemistry Research, Vol. 52, No. 4, pp. 1756-1763. https://doi.org/10.1021/ie302208e
  9. Rainer, B., Fonade, C. and Moser, A., 1995, "Hydrodynamics of a New Type of Ejector," Bioprocess Engineering, Vol. 13, pp. 97-103. https://doi.org/10.1007/BF00420435
  10. Long, X., Han, N. and Chen, Q., 2008, "Influence of Nozzle Exit Tip Thickness on the Performance and Flow Field of Jet Pump," J. of Mechanical Science and Technology, Vol. 22, pp. 1959-1965. https://doi.org/10.1007/s12206-008-0739-4
  11. Yapici, R., 2008, "Experimental Investigation of Performance of Vapour Ejector Refrigeration System Using Refrigerant R123," Energy Conversion & Management, Vol. 49, pp. 953-961. https://doi.org/10.1016/j.enconman.2007.10.006
  12. Balamurugan, S., Lad, M. D., Gaikar, V. G. and Patwardhan, A. W., 2007, "Effect of Geometry on Mass Transfer Characteristics of Ejectors," Industrial & Engineering Chemistry Research, Vol. 46, pp. 8505-8517. https://doi.org/10.1021/ie061602f
  13. Kim, M. I., Kim, O. S., Lee, D. H. and Kim, S. D., 2007, "Numerical and Experimental Investigations of Gas-Liquid Dispersion in an Ejector," Chemical Engineering Science, Vol. 62, pp. 7133-7139. https://doi.org/10.1016/j.ces.2007.08.020
  14. 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 Three-Dimensional CFD Modeling," J. of Mechanical Science and Technology, Vol. 22, pp. 1821-1829. https://doi.org/10.1007/s12206-008-0614-3
  15. Socolofsky, S. A. and Adams, E. E., 2002, "Multiphase Plumes in Uniform and Stratified Crossflow," J. Hydraulic Research, Vol. 40, No. 6, pp. 661-672. https://doi.org/10.1080/00221680209499913
  16. Lima Neto, I. E., Zhu, D. Z. and Rajaratnam, N., 2008, "Horizontal Injection of Gas-Liquid Mixtures in a Water Tank," J. Hydraulic Engineering, Vol. 134, pp. 1722-1731. https://doi.org/10.1061/(ASCE)0733-9429(2008)134:12(1722)
  17. Al-Ahmady, K. K., 2006, "Analysis of Oxygen Transfer Performance on Sub-Surface Aeration Systems," Int. J. Environmental Research and Public Health, Vol. 3, pp. 301-308. https://doi.org/10.3390/ijerph2006030037
  18. Chern, J.M. and Yang, S.P., 2003, "Oxygen Transfer Rate in a Coarse-Bubble Diffused Aeration System," Industrial & Engineering Chemistry Research, Vol. 42, pp. 6653-6660. https://doi.org/10.1021/ie030396y
  19. EL-Sawaf, I. A., Halawa, M. A., Younes, M. A. and Teaima, I. R., 2011, "Study of the Different Parameters That Influence on the Performance of Water Jet Pump," 15th Int. Water Tech. Conference, IWTC 2011, Alexandria, Egypt, pp. 1-17.

Cited by

  1. Development of Venturi System for Microbubble Generation vol.38, pp.10, 2014, https://doi.org/10.3795/KSME-B.2014.38.10.865
  2. Mass Transfer Characteristics of Vertical Two-Phase Flows with Orifice Nozzle vol.39, pp.10, 2015, https://doi.org/10.3795/KSME-B.2015.39.10.817
  3. Flow Characteristics of Central-Driven Ejector with Design Parameters vol.39, pp.8, 2015, https://doi.org/10.3795/KSME-B.2015.39.8.645
  4. Mixed Flow and Oxygen Transfer Characteristics of Vertical Orifice Ejector vol.39, pp.1, 2015, https://doi.org/10.3795/KSME-B.2015.39.1.061