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化工学报  2015 

梯形微通道内乙醇水混合蒸气冷凝流型可视化实验

DOI: 10.11949/j.issn.0438-1157.20150399, PP. 4320-4326

Keywords: 微通道,凝结,两相流,混合蒸气,Marangoni效应

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Abstract:

利用高速摄像系统对梯形硅基微通道进行乙醇水混合蒸气冷凝流型可视化实验。梯形微通道结构为梯形,水力学直径165.87mm,通道长度50mm。实验中混合蒸气乙醇质量分数范围为2%~60%。实验发现入口蒸气乙醇浓度对通道内流型有重要影响。沿着冷凝方向,发现环状流、环状条纹流、翻滚流、喷射流/喷射滴状流及气泡流。不同蒸气入口乙醇质量分数有不同的流型分布,低乙醇浓度的蒸气冷凝环状条纹流及喷射流区域出现伪滴状凝结形式,高乙醇浓度的蒸气冷凝出现翻滚流流型。实验以蒸气质量通量及蒸气干度为坐标对不同入口浓度蒸气冷凝建立了两相流型图,并对喷射流发生干度建立了流型转变预测式。

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