Abstract
It is well established that the microlayer beneath the bubble plays a pivotal effect in the heat transfer in nucleation boiling. However, experimental studies of microlayers in small channel flow boiling are scarce due to measurement difficulty. In this study, laser interferometry and high-speed camera techniques were used simultaneously to investigate the microlayer dynamic characteristics beneath boiling bubbles in a small channel. It is found that the microlayer's interference fringe is still not a complete "Newtonian ring" in small horizontal channels. The downstream of the bubble, the microlayer still shows a "wedge" structure, and the initial microlayer thickness distribution is similar to that of the pool boiling. The microlayer is not entirely evaporated, and the rewetting phenomenon occurs simultaneously with the evaporation of the microlayer. The newly dry spot area and the rewetting area show the characteristics of first increasing to a maximum and then decreasing.
Published Version
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