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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Study of Residence Time Calculation Methods in Decay Tank Design

감쇠탱크 설계를 위한 체류시간 계산 방법에 관한 연구

  • Received : 2017.01.10
  • Accepted : 2017.02.24
  • Published : 2017.05.10
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Abstract

In this study we apply and compare a variety of numerical methods for calculating residence time distribution in decay tanks, a major design component in the for reducing N-16 radioactivity. Our research group has used a streamlined method using user-defined particle numbers. However, this streamlined method has several problems, including low exiting particle ratios, particle diminishing, and unphysical time distribution, among others. We utilize three numerical methods to establish residence time and time distribution (streamlined, discrete phase method [DPM], and user defined scalar [UDS]) and subsequently compare the averaged results of each. The three tests demonstrate the flow features within the decay tanks, which are then numerically simulated to enable comparison. We conclude that although each simulation predicts similar time averages, the UDS methodology provides a smoother time distribution and tracer contour plots at specific times.

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References

  1. Seo, K. W., Park, Y. C., Chi, D. Y., and Yoon, J. H., 2011, Design of a decay tank for a pool type research reactor with a CFD model, The 14th International Topical Meeting on Nuclear Reactor Thermalhydraulics.
  2. Jung, M. K., Seo, K. W., and Kim, S. H., 2016, Flow residence time analysis for decay tank by the design parameters, Trans. of the Korean Nuclear Society Spring Meeting.
  3. ANSYS FLUENT theory guide, 2016, ANSYS Inc.
  4. Levenspiel, O., Chemical Engineering, 1962, John Wiley.
  5. Jeong, N. G., Roh, G. H., Kim, S. H., and Yoon, J. H., 2014, Design evaluation of decay tank for a pool-type research reactor from the required minimum flow residence time point of view, Journal of Nuclear Science and Technology, Vol. 51, pp. 1064-1072. https://doi.org/10.1080/00223131.2014.918525
  6. Verma, G., Sengupta, S., Veluiri, V., Mammen, S., and Bhattacharya, S., 2015, Numerical study of fluid velocity distribution and residence time estimation for a delay tank of a nuclear research reactor, Proc. 42nd National conference on fluid mechanics and fluid power.
  7. Liu, W. C., Chen, W. B., and Hsu, M. H., 2011, Using a three-dimensional particle-tracking model to estimate the residence time and age of water in a tidal estuary, Computers & Geosciences, Vol. 37, pp. 1148-1161. https://doi.org/10.1016/j.cageo.2010.07.007
  8. Jeong, N. G., Seo, K. W., Chi, D. Y., and Yoon, J. H., 2013, Estimation of flow residence time in a decay tank for a pool type research reactor using CFD, Nuclear Engineering and Design, Vol. 255, pp. 162-168. https://doi.org/10.1016/j.nucengdes.2012.10.025
  9. Egarr, D., Faram, M. G., O'Doherty, T., Phipps, D., and Syred, N., 2005, Computational fluid dynamic prediction of the residence time distribution of a prototype hydrodynamic vortex separator operating with a base flow component, Journal of Process Mechanical Engineering, Vol. 216, pp. 53-67.
  10. Choi, B. S., Wan, B., Philyaw, S., Dhanasekharan, K., and Ring, T. A., 2004, Residence time distributions in a stirred tank : Comparison of CFD Predictions with Experiment, Ind. Eng. Chem, Vol. 43, pp. 6548-6556. https://doi.org/10.1021/ie0308240
  11. Sahai, Y. and Emi, T., 1996, Melt flow characterization in continuous casting turndishes, ISIJ International, Vol. 36, pp. 667-672. https://doi.org/10.2355/isijinternational.36.667