| 摘要: |
| 微尺度下的相变强化传热是微电子领域散热的研究热点，而微通道内气液两相流流型和压降分析是微流动系统设计和控制的基础。本文针对并联矩形突扩微通道，通过流型可视化、理论分析及实验研究的方式，对微通道内两相流动特性进行了分析研究。通过可视化实验，在并联矩形突扩微通道内观察到了4种典型流动，分别为泡状流、塞状流、弹状流和环状流。当Qg=110 mL/min、Ql=20 mL/min时，两相流动流型达到最大程度的射流状态，出现充分流体射流情况。通过建立压降预测模型，结合实验结果分析了压降模型的适用性和精度，结果表明：含有突扩结构的并联矩形微通道在质量流速为367~691 kg/(m2·s)范围内的压降预测模型的平均预测误差为18.56%，优于经典文献中的预测精度，且随着整体压降的增大，预测精度增大。 |
| 关键词: 压降 微通道 气液两相流 可视化 |
| DOI： |
| 投稿时间：2019-04-22 修订日期：2019-06-06
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| 基金项目: |
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| Study on Gas-liquid Two-phase Flow in Parallel Rectangular Sudden Expansion Micro-channels |
| Liu Shuangting,Jiao Yonggang,Gao Bo,Wang Haihua |
| (College of Mechanical Engineering, Shijiazhuang Tiedao University) |
| Abstract: |
| Enhanced heat transfer in microscale has been highlighted in the field of microelectronics. The gas-liquid flow patterns and pressure drop analysis are fundamental for the design and control of microfluidic systems. In this study, two-phase flow characteristics in parallel rectangular micro-channels with sudden expansion were studied by flow patterns visualization, theoretical analysis, and experimental study. Through visualization experiments, four typical flows, i.e., bubble flow, plug flow, slug flow, and annular flow, were observed in parallel rectangular micro-channels with sudden expansion. When Qg = 110 mL/min and Ql = 20mL/min, the two-phase flow pattern achieves the maximum jet state, and a full fluid jet appears. By?means?of?setting?up?a?total pressure drop prediction?model of the parallel rectangular micro-channel with sudden expansion at the mass velocity of two-phase flow ranges from 367 kg/(m2·s) to 691 kg/(m2·s), their applicability and accuracy were analyzed. The results showed that the average prediction?error is 18.56%, which is superior to the prediction accuracy in classical literature. Additionally, with the increase in the overall pressure drop, the prediction accuracy increases. |
| Key words: pressure drop microchannels gas-liquid flow visualization |
