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实验观测了水力直径为150μm,宽深比3,通道壁面水接触角为130°的疏水矩形微通道内的流动冷凝过程。发现疏水微通道内的流型主要有珠状流、珠状-环状复合流、珠状-喷射复合流和弹状-泡状流。由于壁面的疏水性,喷射流处仍能观察到珠状凝结。珠状-喷射复合流的位置随入口蒸汽Reynolds数的增大而向通道出口移动,喷射频率随Re_v增大而增大。珠状-喷射复合流之后为弹状-泡状流,喷射流产生汽泡会冲击前一汽泡并合并流向通道出口。
The flow condensation in a hydrophobic rectangular microchannel with a diameter of 150 μm, a width-to-height ratio of 3, and a water contact angle of 130 ° was measured experimentally. It is found that the flow patterns in the hydrophobic microchannels mainly include bead flow, bead-ring composite flow, bead-jet composite flow and slug-bubble flow. Due to the hydrophobic nature of the wall, bead-like condensation was still observed at the jet. The location of the bead-jet composite flow moves toward the outlet of the channel with the increase of the Reynolds number of the inlet steam, and the jet frequency increases with the increase of Re_v. Beads - After ejecting the composite flow, there is a slug-bubble flow, and the bubble generated by the jet impacts the previous bubble and merges to the exit of the passage.