The characteristics of gas-liquid Taylor (Slug) flow in a square micro-channel of 600×600 ㎛ were investigated experimentally in this paper. The test fluids were nitrogen and water. The liquid and gas superficial velocities were 0.01 ~3 m/s and 0.1~3 m/s, respectively. Bubble and liquid slug length, bubble velocity, and frequency were measured by analyzing optical images using a high speed camera. Bubble length decreased with higher liquid flow rate, which increased dramatically with higher gas flow rate. However, slug length did not vary with changes in inlet liquid conditions. Additionally, bubble velocities and frequencies increased with higher liquid and gas flow rates. It was found that measured bubble lengths were in good agreement with the empirical models in the existing literature, but slug lengths were not.Key words Micro-channel(미세관), Two-phase flow(2상 유동), Taylor flow(Taylor 유동), Bubble(기포), Slug(슬러그) †Corresponding author, E-mail: jklee99@kyungnam.ac.kr (Fig. 1).기존의 Taylor 유동과 관련한 많은 연구들이 Taylor 기포의 길이를 측정하고 여러 가지 입구조건에 대해 길이를 예측하는 데에 집중되어 있는데, 유로에서의 압 력강하와 물질전달 등을 결정하는데 중요한 인자가 되 기 때문이다. 기포 길이에 대한 기존 연구에 대해, 기 포가 유로를 대부분 채워서 흐르는 Taylor flow가 주로 발생하는 Ca 수( )가 작은 경우에 대해(sq-
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