Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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IMPROVEMENTS OF CONDENSATION HEAT TRANSFER MODELS IN MARS CODE FOR LAMINAR FLOW IN PRESENCE OF NON-CONDENSABLE GAS

  • Bang, Young-Suk (Nuclear Engineering Department, Seoul National Univ.) ;
  • Chun, Ji-Ran (BK2l Research Division of SNU for Energy Resource, Seoul National Univ.) ;
  • Chung, Bub-Dong (Thermal Hydraulic Safety Research Department, Korea Atomic Energy Research Institute) ;
  • Park, Goon-Cherl (Nuclear Engineering Department, Seoul National Univ.)
  • Published : 2009.10.31
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Abstract

The presence of a non-condensable gas can considerably reduce the level of condensation heat transfer. The non-condensable gas effect is a primary concern in some passive systems used in advanced design concepts, such as the Passive Residual Heat Removal System (PRHRS) of the System-integrated Modular Advanced ReacTor (SMART) and the Passive Containment Cooling System (PCCS) of the Simplified Boiling Water Reactor (SBWR). This study examined the capability of the Multi-dimensional Analysis of Reactor Safety (MARS) code to predict condensation heat transfer in a vertical tube containing a non-condensable gas. Five experiments were simulated to evaluate the MARS code. The results of the simulations showed that the MARS code overestimated the condensation heat transfer coefficient compared to the experimental data. In particular, in small-diameter cases, the MARS predictions showed significant differences from the measured data, and the condensation heat transfer coefficient behavior along the tube did not match the experimental data. A new method for calculating condensation heat transfer coefficient was incorporated in MARS that considers the interfacial shear stress as well as flow condition determination criterion. The predictions were improved by using the new condensation model.

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References

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