Abstract This paper designs the treelike networks with the wedge-shaped channel from the idea of bionics. Pool boiling heat transfer experiments of FC-72 under different liquid subcoolings were conducted on the networks with different branch levels. The bubble phenomenon was recorded to reveal the boiling mechanism. The bubble pumpless movement towards the diverging direction in the wedge-shaped channel under the action of capillary force was observed. Under the saturated condition, the surfaces are easier to be completely covered by bubbles and the effect of treelike networks is hindered, which results in similar heat transfer performance. With the increase of liquid subcoolings, the bubble fraction decreases and the effect of the branch level comes into effect. On the surface with high branch level, the bubbles are transported immediately at small radius by the narrow wedge-shaped channel. The moving bubbles disturb the fluid and coalesce with other bubbles, which increases the heat transfer coefficient. There are also more liquid supply pathways between small bubbles, which increases the critical heat flux. The importance of this research is to provide a solution to the difficulty of bubbles vertical departure caused by the lack of buoyancy under microgravity.

中文翻译：

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具有楔形通道的树状网络上的池沸腾传热和气泡行为

摘要 本文从仿生学的思想出发，设计了具有楔形通道的树状网络。FC-72 在不同液体过冷度下的池沸腾传热实验在不同支路水平的网络上进行。记录气泡现象以揭示沸腾机制。观察到气泡在毛细力作用下在楔形通道中向发散方向的无泵运动。在饱和状态下，表面更容易被气泡完全覆盖，阻碍了树状网络的作用，从而导致类似的传热性能。随着液体过冷度的增加，气泡分数降低，支管水平效应开始发挥作用。在具有高分支水平的表面上，气泡被狭窄的楔形通道以小半径立即输送。移动的气泡扰乱流体并与其他气泡合并，从而增加传热系数。小气泡之间也有更多的液体供应路径，这增加了临界热通量。本研究的重要意义在于为微重力下由于缺乏浮力而导致气泡垂直偏离的困难提供解决方案。