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首页> 外文期刊>International Journal of Heat and Mass Transfer >Bubble-top jet flow on microwires
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Bubble-top jet flow on microwires

机译：微丝上的气泡顶部喷射流

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Bubble-top jet flows were investigated using high-speed photography and laser PIV (particle image velocimetry) technology. The bubble-top jet flow formation process was experimentally observed and described in detail. Pre-jet flows were also observed in advance of the jet flow formation in the early stage of bubble growth. The developed jet flow structure was divided into four different regions. In the pumped region, the hot liquid was pumped up from wire surface. The pumping effect was an important behavior of the jet flow, which caused highly efficient single-phase heat transfer near the bubble bottom, and also caused strong interactions between neighboring bubbles. The interaction and self-organization among the jet flows produced a relatively regular flow field. Bubble size greatly influenced the jet flow intensity and increased the complexity of the jet flow structure. Multi-jet flows were observed on larger bubbles. The experimental results suggest that the jet flows were induced by surface tension gradients or strong thermal non-equilibrium around a bubble rather than the evaporation and condensation within the bubble.
机译：使用高速摄影和激光PIV（粒子图像测速）技术研究了气泡顶部喷射流。通过实验观察并详细描述了气泡顶射流的形成过程。在气泡生长的早期阶段，在喷射流形成之前还观察到喷射前流。发达的射流结构分为四个不同的区域。在泵送区域中，热液体从金属丝表面被泵出。泵送效应是射流的重要行为，它引起气泡底部附近的高效单相传热，并且还引起相邻气泡之间的强相互作用。射流之间的相互作用和自组织产生了相对规则的流场。气泡大小极大地影响了射流强度并增加了射流结构的复杂性。在较大的气泡上观察到多喷流。实验结果表明，喷射流是由气泡周围的表面张力梯度或强烈的热不平衡引起的，而不是气泡内的蒸发和冷凝引起的。

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