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

  • 제25권5호
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  • Pages.233-239
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  • 2013
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  • 1229-6422(pISSN)
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  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
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CO2-Hydrate와 CO2 가스 혼합물의 전달물성과 관내측 열전달계수 및 압력강하 예측

Thermophysical Properties of CO2 and CO2-Hydrate Mixture and In-Tube Heat Transfer Characteristics

  • 윤린 (한밭대학교 기계공학과)
  • Yun, Rin (Department of Mechanical Engineering, Hanbat National University)
  • 투고 : 2012.12.17
  • 발행 : 2013.05.10
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초록

The Thermophysical properties of thermal conductivity, viscosity, and heat capacity for $CO_2$ slurry ($CO_2$ gas and $CO_2$-hydrate mixture) having a high gas phase volume fraction were predicted using the conventional mixture models and the TRAPP model under hydrate formation conditions. Based on the calculated thermophysical properties, the heat transfer coefficient and pressure drop of the $CO_2$ slurry in the tube were predicted. The thermal conductivity of $CO_2$ slurry ranged from 0.02 to 0.2 W/m-K, and the mixture viscosity was larger than that of pure $CO_2$ by 1.9~2.7 times. The heat capacity of $CO_2$ slurry ranged from 63 to 68% of that for pure $CO_2$. The predicted heat transfer coefficient of $CO_2$ slurry was 6 times higher than that of pure $CO_2$. In the separate model, the estimated pressure drop increased with an increase of $CO_2$-hydrate mole fraction, and was 60% of that of pure $CO_2$.

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