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套管换热器换热特性的数值分析

Keywords: 套管换热器,对流换热,数值模拟

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Abstract:

采用三维模型数值模拟了套管的换热特性,分析了套管换热器出口位置、倾角对套管对流换热性能的影响,选择给出了部分截面上的温度、Nusselt数(Nu)和对流换热系数的分布.结果表明:套管出口位置对换热量有重要影响,而倾角对换热量影响很小;温度在热边界层内发生剧烈变化,外管壁面温度变化不明显;对流换热系数随雷诺数(Re)(2650~10800)的增加而增加.将Nu的计算结果与Kays和Leung的解析解作了比较,二者吻合很好.

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