Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Numerical Analysis on Melting Phenomena and Phase Interface Change of Frozen Urea-aqueous Solution by Electric Heater

전기 히터 방식의 동결 우레아 해동 현상 및 상경계면 이동에 대한 수치해석

  • Woo, Seongmin (Department of Mechanical Engineering, Graduate School of Chonnam National University) ;
  • Choi, Byungchul (School of Mechanical Engineering, Chonnam National University)
  • 우성민 (전남대학교 대학원 기계공학과) ;
  • 최병철 (전남대학교 기계공학부)
  • Received : 2013.08.09
  • Accepted : 2014.03.24
  • Published : 2014.07.01
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Abstract

Urea-SCR system is the selective catalytic reduction to reduce nitrogen oxides ($NO_x$) emitted from diesel vehicles. The objective of this study is numerical analysis of 3-dimensional unsteady melting problems of frozen urea by using an electric heater. It can be applied to determine capacity of power with respect to time and the location of the urea suction pipe in urea storage tank. The study includes the change of liquid volume fraction, temperature profiles and a influence of natural convection by using the commercial software STAR-CCM+(v7.06). The accuracy of the numerical analysis is estimated by comparisons with experimental data. After validation, a numerical analysis for freezing urea is conducted with four different heating power. From the results, it was found that relation of velocity of phase interface and amount of melting urea by increasing heating power in a container. There is also a difference in trend between velocity of phase interface and amounts of melting urea because of effect of natural convection.

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References

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