# 입자가 포함된 유동장에서 유체속도와 입자속도의 동시 측정기법

• Jin Dong-Xu (Thermal/Flow Control Research Center, Korea Institute of Science & Technology(KIST)) ;
• Lee Dae-Young (Thermal/Flow Control Research Center, Korea Institute of Science & Technology(KIST)) ;
• Lee Yoon-Pyo (Thermal/Flow Control Research Center, Korea Institute of Science & Technology(KIST))
• 김동욱 (한국과학기술연구원 열유동제어연구센터) ;
• 이대영 (한국과학기술연구원 열유동제어연구센터) ;
• 이윤표 (한국과학기술연구원 열유동제어연구센터)
• Published : 2005.04.01

#### Abstract

A novel method for simultaneously measuring the fluid velocity and the large particle velocity in a particle-containing fluid flow is developed in this study. In this method, the fluid velocity and the large particle velocity are measured by PIV and PTV, respectively. The PIV and PTV images are obtained from the same flow images. Since a PIV result represents the average displacement of all particles in an interrogation area, it will include an error caused by the relative displacement between the large particles and the fluid. In order to reduce the false influence of large particles on the PIV calculation, the mean brightness of small PIV particle images is substituted to the locations of large particles in the PIV images. The simulation results showed that the new method significantly reduces the PIV error caused by the large particles even at the case where the large particles occupy area fraction as large as $20\%$ of the full image.

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