Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Numerical Investigation of the Urea Melting and Heat Transfer Characteristics with Three Different Types of Coolant Heaters

냉각수 순환 방식 가열원 형상에 따른 요소수 해동 특성에 관한 수치적 연구

  • 이승엽 (전북대학교 항공우주공학과) ;
  • 김만영 (전북대학교 항공우주공학과) ;
  • 이천환 (자동차부품연구원 친환경디젤하이브리드연구센터) ;
  • 박윤범 (제주산업정보대학 자동차과)
  • Received : 2011.11.11
  • Accepted : 2011.12.07
  • Published : 2012.07.01
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Abstract

Urea-SCR system, which converts nitrogen oxides to nitrogen and water in the presence of a reducing agent, usually AdBlue urea solution, is known as one of the powerful NOx reduction systems for mobile as well as stationary applications. For its consistent and reliable operation in mobile applications, such various problems as transient injection, ammonia slip, and freezing in cold weather have to be resolved. In this work, therefore, numerical study on three-dimensional unsteady heating problems were analyzed to understand the melting and heat transfer characteristics such as urea liquid volume fraction, temperature profiles and generated natural convection behavior in urea solution by using the commercial software Fluent 6.3. After validating by comparing numerical and experimental data with pure gallium melting phenomena, numerical experiment for urea melting is conducted with three different coolant heating models named CH1, 2, and 3, respectively. Finally, it can be found that the CH3 model, in which more coolant is concentrated on the lower part of the urea tank, has relatively better melting capability than others in terms of urea quantity of $1{\ell}$ for start-up schedule.

Keywords

References

  1. J. H. Kim, M. Y. Kim and H. G. Kim, "$NO_2$-Assisted Soot Regeneration Behavior in a Diesel Particulate Filter with Heavy-duty Diesel Exhaust Gases," Numer. Heat Transfer, Part A, Vol.58, pp.725-739, 2010. https://doi.org/10.1080/10407782.2010.523293
  2. M. Y. Kim, "Performance Prediction of SCR-DeNOX System for Reduction of Diesel Engine NOX Emission," Transactions of KSAE, Vol.11, No.3, pp.71-76, 2003.
  3. B. Yun, C. Kim, M. Y. Kim, G. Cho, H. Kim and Y. Jeong, "Numerical Modeling of Vanadia-Based Commercial Urea-SCR plus DOC System for Heavy-duty Diesel Exhaust After Treatment System," Transactions of KSAE, Vol.18, No.2, pp.24-30, 2010.
  4. C. R. Swaminathan and V. R. Voller, "A General Enthalpy Method for Modeling Solidification Processes," Transaction of Metallurgical, Vol.23(B), pp.651-664, 1992. https://doi.org/10.1007/BF02649725
  5. Y. D. Hong and C. K. Park, "Numerical Analysis on Phase-change of Pure Water by Using Moving Grid," Fall Conference Proceedings, KSME, pp.1906-1911, 2002.
  6. K. G. Kang, H. S. Ryou and N. K. Hur, "Numerical Analysis of Solidification and Melting Phase Change Using Modified PISO Algorithm," Transactions of KSCFE, Vol.3, No.8, pp.12-20, 2003.
  7. H. K. Kim, S. Jeong, N. Hur, T. Lim and Y. S. Park, "Numerical Analysis of Melting Process in a Water Tank for Fuel-cell Vehicle," Transactions of SAREK, Vol.19, No.8, pp.585-592, 2007.
  8. J. Hwang, H. Heo and C. Lee, "The Thawing Characteristics of Frozen Urea Solution for Heating System Design of Urea-SCR System on Commercial Heavy Duty Vehicle," Annual Conference Proceedings, KSAE, pp.1065-1069, 2010.
  9. B. C. Choi, C. K. Seo and K. J. Myong, "Freezing and Melting Phenomena of Urea-water Solution for Diesel Vehicle SCR system," Transactions of KSPSE, Vol.4, No.13, pp.5-10, 2009.
  10. W. Stefan, "Numerical Heat Transfer and Thermal Engineering of AdBlue(SCR) Tanks for Combustion Engine Emission Reduction," Applied Thermal Engineering, Vol.27, pp.1790-1798, 2007. https://doi.org/10.1016/j.applthermaleng.2007.01.008
  11. C. Gau, and R. Viskanta, "Melting and Solidification of a Pure Metal on a Vertical Wall," Journal of Heat Transfer, Vol.108, pp.174-181, 1986. https://doi.org/10.1115/1.3246884
  12. A. D. Brent, V. R. Voller and K. J. Reid, "The Enthalpy-porosity Technique for Modeling Convection-diffusion Phase Change: Application to The Melting of a Pure Metal," Numer. Heat Transfer, Vol.13, pp.295-318, 1988.
  13. M. Sathiyamoorthy and A. Chamkha, "Effect of Magnetic Field on Natural Convection Flow in a Liquid Gallium filled Square Cavity for Linearly heated side Wall(s)," Int. J. Thermal Sciences, Vol.49, pp.1856-1856, 2010. https://doi.org/10.1016/j.ijthermalsci.2010.04.014
  14. Fluent, Release 12.0 User's Guide, 2009.
  15. M. Egal, T. Budtova and P. Navard, "The Dissolution of Microcrystalline Cellulose in Sodium Hydroxide-Urea Aqueous Solution," Cellulose, Vol.15, pp.361-370, 2008. https://doi.org/10.1007/s10570-007-9185-1
  16. M. M. Cerimele, D. Mansutti and F. Pistella, "Numerical Modelling of Liquid/Solid Phase Transitions Analysis of a Gallium Melting Test," Computers & Fluids, Vol.31, pp.437-451, 2002. https://doi.org/10.1016/S0045-7930(01)00062-7
  17. B. Xu, B. Q. Li and D. E. Stock, "An Experimental Study of Thermally induced Convection of Molten Gallium in Magnetic Fields," Int. J. Heat Mass Transfer, Vol.49, pp.2009-2019, 2006. https://doi.org/10.1016/j.ijheatmasstransfer.2005.11.033
  18. S. Kim, M. C. Kim and B. Lee, "Numerical Analysis of Convection-driven Melting and Solidification in a Rectangular Enclosure," J. Ind. Eng. Chemistry, Vol.8, No.2, pp.185-190, 2002.

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