采用横向渐扩腔强化微通道相变换热研究

Research on enhanced phase change heat transfer in micro-channels using a lateral expanding cavity

中文关键词: 分相式微通道，流动沸腾，强化换热，流型调控

英文关键词: split phase microchannel  flow boiling  enhanced heat transfer  flow pattern control

中文摘要:

      微通道换热器具有结构紧凑、比表面积大等优势，在储能电池热管理、电子器件冷却等领域具有广阔的应用前景。微通道相变换热过程中，气泡活化后易迅速生长并充满整个通流截面，导致通道内压降、温度等参数产生大幅脉动，影响换热器的稳定运行。为了改善这一问题，提出一种对工质进行气液相分布调控以强化换热的新思路，构建了新型微通道结构，对比研究了分相式微通道和普通平行式微通道的换热特性，揭示了调控相分布强化换热的机理。研究发现，分相式微通道的换热系数比普通平行微通道提高了55.7%，综合强化因子也达到了1.93。

英文摘要:

      Microchannel heat exchangers have advantages such as compact structure and large specific surface area. It has broad application prospects in the fields of thermal management of energy storage batteries and cool-ing of electronic devices. During the microchannel phase change heat transfer process, activated bubbles are prone to rapidly grow and fill the entire flow cross-section, resulting in significant fluctuations in pa-rameters such as pressure drop and temperature inside the channel, which affects the stable operation of the heat exchanger. In order to improve this problem, a new approach is proposed to regulate the gas-liquid phase distribution of the working fluid to enhance heat transfer. A new type of microchannel struc-ture is constructed, and the heat transfer characteristics of split phase microchannels and ordinary parallel microchannels are compared and studied, revealing the mechanism of regulating phase distribution to en-hance heat transfer. Research has found that the heat transfer coefficient of split phase microchannels is 55.7% higher than that of ordinary parallel microchannels, and the comprehensive enhancement factor also reaches 1.93.