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김경문(Koung Moon Kim),황지환(Ji Hwan Hwang),이창훈(Chang Hun Lee),심규현(Gyu Hyeon Shim),정동욱(Dong-Wook Jerng),안호선(Ho Seon Ahn) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
One of the key safety features of a Prototype Gen-IV Sodium-cooled Fast Reactor (PGSFR) is the adopting of reactor vault cooling system (RVCS). Development of the PGSFR has been ongoing in KAERI (Korea Atomic Energy Research Institute). The assessment of the RVCS must be conducted to ensure decay heat removal capability under severe accident conditions. A down scale model is developed by the Ishii’s method of scaling law, which is based on the three similitude laws, i.e. dynamic, kinematic, and geometric. First, we have considered the basic energy balance between the total heat generation from the decay heat and heat removal from heat transfer, e.g. the natural circulation and the radiation heat transfer. For the reliable design of the experimental facility of RVCS, it would be considered the non-dimensional Richardson number from the momentum equation as the key parameter, which would determine the driven buoyancy flow regrading to the temperature difference of air flow. To finalize the scale analysis, we have compared CFD simulation.
벤츄리 타입 마이크로버블 발생장치에서 스크류 구조 영향에 의한 기포 미립화에 대한 실험적 연구
이창훈(Chang Hun Lee),박수청(Su Chung Park),김경문(Koung Moon Kim),김지민(Ji Min Kim),김지훈(Ji Min Kim),한석원(Seok Won Han),서태일(Tae-Il Seo),권재성(jae Sung Kwon),김상문(Sang moon Kim),안호선(Ho Seon Ahn) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
This study was investigated of additional bubble breaking by screw shape in venturi-type air self-inhalation microbubble generator. In order to determine the influence of the varing flow characteristics (pressure and air flow rate) by screw shape, prior experiment was performed and evaluated. Furthermore, in order to identify the secondary flow caused by screw shape, a computational fluid dynamics (CFD) simulation was performed using the commercial CFD software ANSYS CFX-14.0. The analysis results showed that average rotational velocity in nozzle is inversely proportional to the size and number of microbubbles, acquiring from microbubble generation experiment.