Simulations of turbulence, heat transfer and mixing across narrow gaps between rod-bundle subchannels |
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Authors: | D Chang S Tavoularis |
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Affiliation: | aDepartment of Mechanical Engineering, University of Ottawa, 770 King Edward Avenue, Ottawa, Ontario, Canada K1N 6N5 |
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Abstract: | Turbulent flow and temperature fields were determined numerically in a rectangular duct containing a heated rod. As the spacing δ between the rod and the duct wall decreased from 0.10D (D is the rod diameter) to 0.03D, coherent turbulent kinetic energy and temperature fluctuations dramatically increased in the gap region, but, for δ = 0.01D, coherent fluctuations essentially disappeared. As δ/D → 0, the frequency of coherent fluctuations decreased and cross-gap mixing weakened, contrary to predictions based on extrapolated available empirical correlations. |
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