Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Numerical Investigation on Wall Flow Control for Preventing Contaminants Deposition inside a Duct

덕트 내 오염물질 퇴적 방지를 위한 벽면유동 제어에 관한 해석적 연구

  • Lee, Banguk (Research and Development Division, Hyundai Motor Co.) ;
  • Lee, Jeekeun (Department of Mechanical System Engineering, Chonbuk National University)
  • Received : 2013.02.27
  • Published : 2013.05.10
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Abstract

Technologies for preventing contaminants deposition are a key issue in a modern duct system. When particulate matters deposit inside the exhaust pipes, which are widely used in the Urea-SCR system to reduce $NO_x$ emission from heavy duty diesel engines, many problems arise associated with increased flow resistance and corrosion. Therefore, the development of the urea deposition avoidance technologies is being treated as an important issue of the Urea-SCR system. An analytical study was carried out to investigate the effects of the wall flow around the mixer with the variation of the mixer housing surrounding and supporting the mixer, which is designed to increase the wall flow and then to reduce droplet deposition. The housing angles and the position of the mixer were changed：angles of $0^{\circ}$, $1^{\circ}$, $2^{\circ}$, and $3^{\circ}$, and mixer positions of 0 L, 0.5 L, and 1 L. The axial velocity distributions, maximum velocity, the half-width, and momentum distribution of the wall flow were investigated to examine the effect of the mixer-housing assembly geometry.

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References

  1. Peters, T. M. and Leith, D., 2004, Modeling Large- Particle Deposition in Bends of Exhaust Ventilation Systems, Aerosol Science and Technology, Vol. 38, pp. 1171-1177. https://doi.org/10.1080/027868290896834
  2. Peters, T. M. and Leith, D., 2004, Measurement of Particle Deposition in Industrial Ducts, Aerosol Science Vol. 35, pp. 529-540. https://doi.org/10.1016/j.jaerosci.2003.10.004
  3. Zhang, Z., Chen, X., Mazumdar, S., Zhang, T., and Chen, Q., 2009, Experimental and Numerical Investigation of Airflow and Contaminant Transport in an Airliner Cabin Mockup, Building and Environment, Vol. 44, pp. 85-94. https://doi.org/10.1016/j.buildenv.2008.01.012
  4. Sun, K., Lu, L., and Jiang, H., 2012, A Numerical Study of Bend-induced Particle Deposition in and behind Duct Bends, Building and Environment, Vol. 52, pp. 77-87.
  5. Huang, Z., Zhu, Z., Liu, Z., and Liu, Q., 2003, Formation and Reaction of Ammonium Sulfate Salts on V2O5/AC Catalyst During Selective Catalytic Reduction of Nitric Oxide by Ammonia at Low Temperatures, Journal of Catalysis, Vol. 214, pp. 213-219. https://doi.org/10.1016/S0021-9517(02)00157-4
  6. Heering, H. P., Onder, C. H., Elsener, M., and Schaer, C. M., 2003, Control of a Urea SCR Catalytic Converter System for a Mobile Heavy Duty Diesel Engine, SAE 2003-01-0776.
  7. Jeong, S. J. and Lee, C. H., 2008, A Study on the Injection Characteristics of Urea Solution to Improve $deNO_x$ Performance of Urea-SCR Catalyst in a Heavy Duty Diesel Engine, Transactions of KSAE, Vol. 16, No. 4, pp. 165-172.
  8. Grout, S., Blaisot, J., Pajot, K., and Osbat, G., 2012, Experimental Investigation on the Injection of An Urea-water Solution in Hot Air Stream for the SCR Application:Evaporation and Spray/Wall Interaction, Fuel, Available:http://dx.doi.org/10.1016/j.fuel.2012.09.022.
  9. Jeong, S. J., Lee, S. J., Kim, W. S., and Lee, C. B., 2006, Numerical Study on the Injector Shape and Location of Urea SCR System of Heavy-duty Diesel Engine for Preventing $NH_3$ Slip, Transactions of KSAE, Vol. 14, No. 1, pp. 68-78.
  10. Seo, J. W., Lee, K. I., Oh, J. T., Choi, Y. H., Lee, J. H., and Park, J. I., 2008, The Study on the Effects of Mixer Configurations on Fluid Mixing Characteristics in SCR Systems, Transactions of KSAE, Vol. 16, No. 6, pp. 192-199.
  11. Shuyang, C. and Tetsuro, T., 2007, Effects of Roughness Blocks on Atmospheric Boundary Layer Flow over a Two-dimensional Low Hill with/without Sudden Roughness Change, Journal of Wind Engineering and Industrial Aerodynamics, pp. 679-695.
  12. Moss, W. and Baker, S., 1980, Re-circulating Flows Associated with Two-dimensional Steps, Aeronautical Quartaerly, pp. 151-172.
  13. Moon, C., Park, J. C., and Kim, C., 1994, Flow Visualization and Numerical Calculation in a Channel Perturbed by Curvilinear Blockages, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 6, No. 3, pp. 218-226.
  14. Mudgal, B. V. and Pani, B. S., 1998, Flow around Obstacles in Plane Turbulent Wall Jets, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 73, pp. 193-213. https://doi.org/10.1016/S0167-6105(97)00288-2
  15. Fluent User Guide 6.2, The RNG k-$\varepsilon$ Model, pp. 11-17.
  16. Singh, R. K. and Seshadri, V., 2009, Study on the Effect of Vertex Angle and Upstream Swirl on the Performance Characteristics of Cone Flowmeter using CFD, Flow measurement and Instrumentation, Vol. 20, pp. 69-74. https://doi.org/10.1016/j.flowmeasinst.2008.12.003
  17. Verhoff, A., 1963, The Two-dimensional Turbulent Wall Jet with and without an External Stream, Princeton University, Report # 629.