Effect of the heat transfer liquid fin on critical heat flux enhancement under ERVC condition
作者： Min Ho Lee , Hyo Heo , In Cheol Bang
DOI: 10.1016/J.IJHEATMASSTRANSFER.2020.119304
关键词: Thermal conduction 、 Heat transfer 、 Natural circulation 、 Fin 、 Thermal conductivity 、 Heat flux 、 Critical heat flux 、 Materials science 、 Mechanics 、 Prandtl number
摘要: Abstract Several critical heat flux (CHF) enhancement methods for in-vessel retention through external reactor vessel cooling (IVR-ERVC) have been researched. However, they some limitations practical applications. In the present study, transfer liquid fin concept was suggested to address issue of CHF by spreading focusing effect flux. The located outside pressure vessel; it is activated filling under accident situations. Liquid metal and oil were selected as materials are characterized significantly different Prandtl numbers; this property helps clearly distinguish mechanisms involved. Analysis conducted based on both experimental numerical methods. As expected, conduction natural circulation dominant in case fin, respectively. Regardless number safety margin increased cases. profile showed a moderately flattened shaped. mitigated upwardly shifted (natural primary mechanism). Although exhibited good performance terms securing CHF, temperature increment much higher because relative lower thermal conductivity latter. Thus, use low fins requires limit be taken into consideration.
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