Abstract
Heat transfer experiments were carried out for natural convection in an enclosure, simulating a dry shielded canister with 24 PWR spent fuel assemblies. The objectives of this study were to investigate the thermal hydraulic characteristics of natural convection in the canister and to establish an evaluation method for heat removal from the canister under combined natural convection and thermal radiation. In these experiments, a neon and nitrogen gas mixture was used as a working fluid, based on a thermal hydraulic similarity, in order to simulate exactly the ratio of natural convection and thermal radiation in the experimental apparatus to that in an actual system. The results were analyzed in detail by using a thermal hydraulic analysis computation. It was found that the temperature difference ΔT in the canister was proportional to P−0.3 and the average heat transfer coefficient correlated approximately with the equation: Nu = 0.07Ra1/4. © 1998 Scripta Technica, Heat Trans Jpn Res, 27(4): 284–298, 1998
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