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RISS 인기검색어
- 검색키워드
- 저자 : 오신일(Shin-Il Oh) (검색결과 3 건)
- 무료
- 기관 내 무료
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오신일(Shin-Il Oh),박상희(Sang-Hee Park),오용훈(Yong-Hoon Oh) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
The purpose of this study is to investigate the diffusion range of micro-bubble in DAF and the generation of micro-bubble in Orifice nozzle. To investigate the diffusion range of bubbles in DAF and the generation of micro-bubble by the orifice nozzle, the orifice nozzle diameter( =2∼7mm) and heigh of Baffle(h)/Water Level(H) h/H=0.82, 0.875, 0.93 were changed. The total flow rate flowing into the system showed an increased sharply as increasing of orifice nozzle diameter. But the recycle flow rate and the air inlet flow rate showed a decreased as increasing of nozzle diameter. Changing the nozzle diameter and the baffle height visualized the diffusion range of micro-bubble in a DAF. The diffusion range of micro-bubbles at Separation zone showed an increased as increasing of orificeOrifi nozzle diameter and as decreasing of h/H. Also, the Stratified flow and White water blanket at Separation zone were formed at over nozzle diameter 4mm.
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재순환 유동 공기 자가흡입에 의한 마이크로버블 발생 오리피스 노즐 시스템에 대한 실험적 연구
오신일(Shin-il Oh),박상희(Sang-Hee Park) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.1
An experimental study was performed on the orifice nozzle system that generates micro-bubbles by air self-suction using a venturi nozzle. This study experimentally investigates the amount of air sucked into the venturi nozzle and the number of micro-bubbles generated by the orifice nozzle system in Cases 1 and 2. The experimental conditions were varied by changing the diameter of the orifice nozzle (d=2∼7 ㎜) and the number of holes of the perforated plate nozzle (n = 2-12). In Case 1, the air self-suction was more than 2 LPM at d ≤ 4 ㎜. When d = 4 ㎜, the total number of bubbles was 29,777, and it was confirmed that micro-bubbles occupied approximately 65% of the total number of bubbles. In Case 2, the air self-suction was maintained constant at approximately 2.5 LPM regardless of the number (n) of holes. The total amount of bubbles increased when n increased but remained constant at approximately 44,000 when n ≥ 7 EA. It was also confirmed that more than 80% of all bubbles were micro-bubbles when n ≥ 10 EA. Thus, the number of micro-bubbles increased by approximately 15% compared to the experimental result of Case 1, which was optimized with d = 4 ㎜.
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파형판 열교환기를 이용한 백연저감 시스템에 대한 실험적 연구
오용훈(Yong-Hoon Oh),박상희(Sang-Hee Park),오신일(Shin-Il Oh),조길환(Gil-Hwan Cho) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
This experiment was a study of white plume reduction in range of a high temperature. To investigate the white plume reduction in system, the exhaust air velocity(2, 3, 4m/s), the outdoor air intake velocity(0.5, 1, 1.5m/s) and the water velocity(0.2, 0.4, 0.6m/s) were changed. The system is composed of corrugated plate heat exchanger, Air to Air heat exchanger, Air to Water heat exchanger and mixing chamber. White plume effect was better depending on system operation condition. At whole experimental results, even if temperature and humidity exist under saturation line has occurred the white plume when difference in air temperature between outdoor air is great. But it is showed that white plume is happening in no less than 35℃. Reduction effect of white plume showed that appeared in sequence of case 1, 2, 3, 4 according to the system operating conditions.
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