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空气对水平管内蒸汽强制对流冷凝换热特性的影响

DOI: 10.11990/jheu.201410039

Keywords: 水平管, 空气蒸汽混合气体, 换热系数, 冷凝, 实验研究, 强制对流

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Abstract:

为了研究含空气蒸汽在水平管内强制对流冷凝换热特性,通过实验分析了空气含量及气相流速对局部换热系数的影响;分析了不同空气入口质量分数下,局部换热系数与换热管上、下壁面温度沿换热管轴向的分布规律。结果表明:局部换热系数随空气质量分数的增加而减小,而气相流速的增加会削弱空气对冷凝换热的抑制效果;与纯蒸汽冷凝不同,换热管外下壁面温度会在轴向某一位置后大于上壁面,并且随着入口空气质量分数的增加,该位置逐渐向换热管入口移动;局部换热系数沿轴向变化结果在环状流和波状流条件下存在差异,当空气含量增加时,这种差异会随之减小,使得换热管内局部换热系数轴向变化规律趋于一致。

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