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微通道沸腾不稳定性引起传热恶化,造成设备疲劳损坏。设计入口集成种子汽泡发生器的并行三角形硅基微通道热沉,搭建同步可视化测量实验台。研究高热流密度下不同触发频率种子汽泡抑制微通道内流动沸腾不稳定性,验证种子汽泡主动式控制微通道内沸腾不稳定性的思路。实验结果表明,种子汽泡可有效抑制微通道内沸腾不稳定性,降低壁面温度,将微通道内混乱无序的汽泡动力学转换为规则有序的汽泡动力学。低频下,种子汽泡热控能够有效抑制压力和温度波动;高频下,沸腾不稳定性得到完全抑制,加热膜上温度均匀性得到明显改善,换热显著加强。
Microchannel boiling instability caused by deterioration of heat transfer, resulting in equipment fatigue damage. The design of parallel triangular silicon microchannel heat sink integrated with the seed bubble generator is set up to build a synchronous visualization measuring bench. The flow boiling instability in the microchannel with the different triggering frequency under high heat flux was studied, and the idea of actively controlling the boiling instability in the microchannel by the seed bubble was studied. The experimental results show that the seed bubble can effectively suppress the boiling instability in the microchannel, reduce the wall temperature, and convert the chaotic bubble dynamics in the microchannel into a regular and orderly bubble dynamics. At low frequency, the seed bubble thermal control can effectively suppress the pressure and temperature fluctuations; under high frequency, the boiling instability is completely inhibited, the temperature uniformity of the heating film is significantly improved, the heat transfer significantly strengthened.