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化工学报  2012 

环形通道内置螺旋线圈过冷流动沸腾传热特性

DOI: 10.3969/j.issn.0438-1157.2012.10.012, PP. 3086-3093

Keywords: 螺旋线圈,环形通道,过冷沸腾,强化系数,经验关系式

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Abstract:

研究了置有螺旋线圈的内管加热环形通道中水的过冷流动沸腾传热特性。环形通道由铜制加热棒外套石英玻璃管构成,不同螺旋节距和线丝直径构成的5种螺旋线圈用于实验。对每种置入螺旋线圈管和光滑管分别进行了不同质量流速和热负荷下的16组实验,分析了线丝直径和线圈节距对传热系数的影响规律及机理。结果表明,螺旋线圈存在能使流体发生旋转分离,且使汽化核心密度增大,从而有效强化过冷沸腾换热;传热系数随着线圈节距的减小、线丝直径的增加,即节径比(P/e)减小而增大,当P/e最小为1.5时强化效果最好;最佳强化换热性能较光滑管的高出109%。将实验数据与4个经验关系式的预测值进行了比较,并给出了不同工况下各实验管的强化系数对比。

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