X-ray 미세 영상기법을 이용한 불투명 튜브 내부 미세기포의 크기 및 속도 동시 측정

Simultaneous measurement of size and velocity of micro-bubbles in an opaque tube using X-ray micro-imaging technique

The x-ray micro-imaging technique was employed to measure the size and velocity of micro-bubbles moving in an opaque tube simultaneously. Phase contrast images were obtained at interfaces of micro-bubbles between water and air due to different refractive index. Micro-bubbles of $20\~120{\mu}m$ diameter moving upward in an opaque tube $(\phi=2.7mm)$ were tested. For two different working fluids of tap water and DI water, the measured velocity of micro-bubbles is roughly proportional to the square of bubble size.