Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Mixing Elements in Line Mixer on Mixing and Flow Characteristics

혼화 및 유동특성에 미치는 라인믹서 내 혼합요소의 영향

  • Yu, Dae-Gyeom (School of Mechanical Engineering, Chungbuk National University) ;
  • Lee, Kye-Bock (School of Mechanical Engineering, Chungbuk National University)
  • Received : 2018.08.30
  • Accepted : 2018.10.05
  • Published : 2018.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

This study investigates the effect of the mixing elements on the pressure loss and mixing performance in line mixer. The high density ozone water devices mixed with gas and liquid are used in various fields such as sterilizing of group feeding facilities and water quality management at a fish farm. Due to the decrease in rainfall due to climate change, pasteurization of drinking water from ground water and surface water is extremely important. Therefore, it is intended to develop a line-mixed gas liquid mixer with a small amount of space. In this study, the effects of the number of static mixers and the types and the number of the orifice used in line mixer on the volume fraction and the pressure loss were studied by CFD simulation. The pressure drops of line mixer with orifice which curved vanes were attached to were down to more than 50 percent of that of line mixer with static mixer whereas the mixing performance of the former was similar to that of the latter.

본 연구에서는 라인믹서 내의 압력손실과 혼화성능에 대한 혼합요소의 영향을 해석하였다. 기체와 액체가 혼합된 고농도 오존수 장치는 단체급식시설의 살균 및 소독, 양식장의 수질관리 등 다양한 분야에서 사용되고 있다. 그러나 기존에 사용되는 장치는 가압방식을 사용하여 부피가 매우 크다. 최근에는 기후 변화로 강수량이 감소하여 지하수 및 지표수의 오염으로 음용수의 살균은 매우 중요하다. 따라서 기존의 장치와 대비하여 작은 공간을 사용하면서도 정수기능을 갖는 라인믹서형 기체-액체 혼합장치의 개발이 필요하다. 본 연구에서는 라인믹서 장치 내에 삽입한 혼합요소인 static mixer의 개수, 오리피스의 형태와 개수, 오리피스에 부착된 베인의 모양에 따른 유입유체의 혼화상태와 유동특성을 전산유체역학 모사를 통해 해석하고 혼화상태에 미치는 영향을 평가하였다. 곡면의 베인을 부착한 오리피스를 라인믹서에 사용한 경우 static mixer를 사용한 경우와 비교하여 비슷한 혼화정도를 나타내면서 압력손실양은 50% 이상 감소하는 것을 확인하였다.

Keywords

References

  1. L. Vrale, R. M. Jorden, "Rapid Mixing in Water Treatment", Journal of American Water Works Association, Vol. 63, No.1, pp.52-58, 1971. DOI: https://dx.doi.org/10.1002/j.1551-8833.1971.tb04027.x
  2. S. L. Dixon, Fluid Mechanics and Thermodynamics of Turbomachinery, Butterworth Heinemann, 1998.
  3. H. C. Kim, S. Lee, "Pump diffusion flash mixing (PDFM) for improving coagulation process in drinking water treatment", Separation and Purification Technology, Vol.52, No.1, pp.117-125, 2006. DOI: https://dx.doi.org/10.1016/j.seppur.2006.03.022
  4. M. Stec, P. M. Synowiec, "Numerical method effect on pressure drop estimation in the $Koflo^{(R)}$ static mixer", INZYNIERIA I APARATURA CHEMICZNA, Vol.54, No.2, pp.48-50, 2015.
  5. O. S. Galaktionov, P. D. Anderson, G. W. M. Peters, H. E. H. Meijer, "Analysis and optimization of Kenics Static Mixers", International Polymer Processing, Vol.18, No.2, pp.138-150, 2003. DOI: https://dx.doi.org/10.3139/217.1732
  6. D. M. Hobbs, "Characterization of a Kenics Static Mixer Under Laminar Flow Condition", Ph.D Thesis, The State University of Newjersy, 1997.
  7. C. Kim, N. Park, M. Y. Kim, "Numerical Investigation of the Flow and Mixing Characteristics with the Static Mixer in a Catalytic Combustor for the MCFC Power Plant System", Transactions of the KSME, B, Vol.33, No.3, pp.149-155, 2009. DOI: https://dx.doi.org/10.3795/KSME-B.2009.33.3.149
  8. D. S. Lee, H. G. Kim, M. Y. Ha, Y. H. Park, I. M. Pak, "Mixing Effect by the Geometry of Static Mixer with Turbulent In-Situ Mixing Process", Transactions of the Korean Society of Mechanical Engineers - B, Vol.29, No.12, pp.1307-1312, 2005. DOI: https://dx.doi.org/10.3795/KSME-B.2005.29.12.1307
  9. ANSYS CFX-17.2, ANSYS Inc., 2016.
  10. E. Lang, P. Drtina, F. Strieiff, M. Fleischli, "Numerical simulation of the fluid flow and the mixing process in a static mixer", International Journal of Heat and Mass Transfer, Vol.38, No.12, pp.2239-2250, 1995. DOI: https://dx.doi.org/10.1016/0017-9310(94)00351-U
  11. Z. Shang, J. Lou, H. Li, "A novel Lagrangian algebraic slip mixture model for two-phase flow", Chemical Engineering Science, Vol.102, pp.315-323, 2013. DOI: https://dx.doi.org/10.1016/j.ces.2013.08.017
  12. K. Gonda, K. Kadota, Y. Deki, Y. Tozuka, A. Shimosaka, Y. Shirakawa, J. Hidaka, "Fabrication of composite particles by liquid-liquid interfacial crystallization using an ultrasonic spray nozzle", Powder Technology, Vol.269, pp.401-408, 2015. DOI: https://dx.doi.org/10.1016/j.powtec.2014.09.042