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Evaluation of Convective Heat Transfer Performance of Twist-Vane Spacer Grid in Rod Bundle Flow
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 Title & Authors
Evaluation of Convective Heat Transfer Performance of Twist-Vane Spacer Grid in Rod Bundle Flow
Lee, Chi Young;
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 Abstract
The performance of convective heat transfer in rod bundle flow was experimentally evaluated using a twist-vane spacer grid. A square-arrayed rod bundle was prepared as the test section, with a pitch-to-diameter ratio(P/D) of ~1.35. To check the convective heat transfer performance, the circumferential and longitudinal variations in rod-wall temperatures were measured downstream of the twist-vane spacer grid. In the circumferential measurements, the rod-wall temperature toward the twist-vane tip showed the lowest value, which might be due to the deflected water flow caused by the twist-vane. On the other hand, the wall temperature of the longitudinal measurements near the twist-vane spacer grid decreased dramatically, which implies that the convective heat transfer performance was enhanced. A heat transfer enhancement of ~35 % was achieved near downstream of the twist-vane spacer grid, as compared with the upstream value. Based on the present experimental data, a correlation for predicting the heat transfer performance of a twist-vane spacer grid was proposed.
 Keywords
Rod Bundle Flow;Twist-vane Spacer Grid;Convective Heat Transfer;
 Language
Korean
 Cited by
 References
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