Visualization experiments were performed on migration behavior of bubble cluster emerging from a micro-orifice with liquid cross flow in a mini rectangular channel. Based on the self-developed image processing method

the influences of liquid flow rate and inclination angle of the channel on the size

velocity and trajectory of bubble cluster were discussed. Meanwhile

micro-bubbles accumulation at the top wall of the channel was observed and analyzed under different operating conditions. The bubbles size as well as the angle between bubble trajectory and channel bottom wall decreased with increasing liquid flow rate and inclination angle of the channel. Furthermore

the location and number of the micro-bubbles accumulated at the top wall were distinctly affected by liquid flow rate and channel inclination angle.