The Visualization of Micro Bubble Dynamic Behavior in Capillary Microgrooves

摘要

Rectangular capillary microgrooves are processed on transparent borosilicate glass. Using high-speed photography, bubble dynamic behaviors in the microgrooves are observed and analyzed. It is proved that no bubble departs from the bottom of microgroove. The results show that the whole bubble lifecycle can be divided into three distinct stages according to growing velocity. Compared with macroscopic pool boiling phenomenon, bubble life cycle shortens greatly. Experimental results about time-varying micro bubble sizes are distinctly different from those of theoretical calculation results by the dynamic micro layer model for nucleate pool boiling heat transfer.