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螺旋管内沸腾两相流型与壁温特性实验研究

, PP. 81-86

Keywords: 沸腾两相流,流型,壁温,卧式螺旋管,R134a

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Abstract:

在蒸发温度为5~15℃,工质质量流速变化范围为50~500kg/(m2?s),热流密度范围为5~25kW/m2和干度范围为0.01~0.9的条件下,对R134a在卧式螺旋管内沸腾两相流型及壁温特性进行了实验研究。利用可视化技术对流型进行了观察分析,发现在相同工况条件下,卧式螺旋管上升段和下降段的流型有所不同,特别是形成环状流之前存在明显不同的过渡流型,分别为“波环状流型”和“超大气弹流型”,因此,对上升段和下降段分别建立了流型图。分别获得了卧式螺旋管沿管长和沿螺旋管横截面圆周方向的壁面温度分布特性。壁面温度沿管长呈逐渐降低的趋势;沿横截面圆周方向,最外侧壁温最低,最内侧壁温最高,两侧温度居中。

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