本文实验研究了水在间隙为2.1、2.2、3.6 mm的垂直矩形窄通道内流动沸腾压降,包括入口过冷的情况,得到了在不同操作条件下压降随热流密度的变化曲线,同时分析了曲线变化的原因.实验结果发现:在实验参数范围内,流动沸腾的压降随着质量流速、热流密度和入口干度增加而增大;随着窄缝间隙的增大而减小.窄通道内的压降计算与大通道有显著不同,本文针对窄通道的特点,修正了传统的压降计算模型,模型预测值与实验结果比较,误差在±15.4%之内.
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