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완전발달 난류 원관 유동에서의 3T 및 7T MRI를 이용한 자기공명온도계의 적용
류형우,백승찬,김동현,이활,오석훈,황원태,You, Hyung Woo,Baek, Seungchan,Kim, Dong-Hyun,Lee, Whal,Oh, Sukhoon,Hwang, Wontae 한국가시화정보학회 2020 한국가시화정보학회지 Vol.18 No.1
Magnetic resonance thermometry (MRT) is a technique capable of measuring three-dimensional mean temperature fields by utilizing temperature-dependent shifts in proton resonance frequency. In this study, experimental verification of the technique is obtained by measuring 3D temperature fields within fully developed turbulent pipe flow, using 3T and 7T MRI scanners. The effect of the proton resonance frequency (PRF) thermal constant is examined in detail.
김창민(Changmin Kim),백승찬(Seungchan Baek),지창은(Changeun Ji),황원태(Wontae Hwang) 한국가시화정보학회 2020 한국가시화정보학회지 Vol.18 No.3
In the field of experimental fluid dynamics, the 5-hole probe is one of the most widely used tools to measure flow velocity and pressure. We hereby describe the development of an inexpensive laboratory-based flow calibration system for 5-hole probes. The system is applied to a custom L-shaped probe, and the probe performance is compared against a standard commercial probe in a custom wind tunnel. The setup allows rotation of the probe around the yaw and pitch axes. Static and total pressure values are calculated, and then calibration maps are constructed based on the yaw and pitch angles. Using these maps, errors of the custom probe are found to be ±5% for velocity magnitude and ±3° for direction, compared to the commercial probe, when both pitch and yaw angles are within 40°.