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

Numerical Investigation of the Urea Melting and Heat Transfer Characteristics with Three Different Types of Coolant Heaters

  • 이승엽 (전북대학교 항공우주공학과) ;
  • 김만영 (전북대학교 항공우주공학과) ;
  • 이천환 (자동차부품연구원 친환경디젤하이브리드연구센터) ;
  • 박윤범 (제주산업정보대학 자동차과)
  • 투고 : 2011.11.11
  • 심사 : 2011.12.07
  • 발행 : 2012.07.01

초록

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.

키워드

참고문헌

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피인용 문헌

  1. A Numerical Study on the Flow Characteristics in the Catalytic Muffler with Different Inlet and Outlet Configurations vol.21, pp.5, 2013, https://doi.org/10.7467/KSAE.2013.21.5.059
  2. Numerical Investigation of Urea Freezing and Melting Characteristics Using Coolant Heater vol.37, pp.8, 2013, https://doi.org/10.3795/KSME-B.2013.37.8.717
  3. Effects of Supply Power and Environmental Conditions on Urea Coolant Melting Phenomena in Urea Supply Lines in Vehicles vol.11, pp.5, 2018, https://doi.org/10.3390/en11051099