논문 해외 국제전문학술지(SCI급) Characterization of tornado like flows for improving vortex ventilation performance
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2022-04
- 저자명 Jong Hoon Kang, Jeong Jae Kim, Hanwook Park, Sung Yong Jung
- 학술지명 Journal of Building Engineering
- 발행처명 Elsevier
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 4
홈페이지논문 초록 (Abstract)
The innovative local ventilation systems using vortex flows resembling a tornado have been proposed to improve ventilation performance. The effect of two primary operating conditions, the side jet velocity and exhaust flow rate which are essential for the formation of vortex structures and significantly affect the resulting vortex characteristics, on the vortex characteristics are investigated by employing a particle image velocimetry (PIV) technique. The vortex core is widened and the vortex strength increased when the side jet velocity is increased. When the induced swirling force is sufficient, a higher exhaust flow rate can form a stronger and more stable vortex. Vortex characteristics revealed that the optimal side jet velocity is 1.73 m/s corresponding Re of 2332.4 with a normalized exhaust flow rate of 0.155. In order to quantify the effectiveness of the vortex ventilation system, the concentration of ultra-fine particulate matters was monitored. The ventilation performance has a similar trend with vortex size, circulation and swirl ratio over core region. We herein propose a new-type ventilation system and a useful analysis method based on PIV to characterize tornado-like flows in vortex ventilation systems. In addition, these flow and ventilation results can be used as basic data in the design and operation of vortex ventilation systems.