管壳式冷凝器内低螺纹管的凝结传热模型

Heat Transfer Model for Thread Tube in Shell and Tube Condenser

以蒸气在垂直壁面和水平圆管上的凝结传热特性为基础 ,建立了蒸汽在基管、翅片及翅顶上的凝结传热模型 .对影响低螺纹管传热的结构参数翅片间距、翅片夹角以及当量翅高进行了计算分析 ,进而建立了低螺纹管管簇的凝结传热模型 ,得出了低螺纹管管簇的平均冷凝传热系数与管排数和管列数之间的关系式 .

The heat transfer model was built that the steam condensates on the base tube, the fins and the tops of the fin, which is based on that the steam condensates on the upright surface and the horizontal tube. The geometrical parameters, such as the space between the fins, the angle and the relative height of the fin, which can affect the heat transfer coefficient between the steam and the thread tube, were studied. Finally, the model of a group of tubes was built based on the model of the single tube. The result between the heat transfer coefficient and the column number of the fins can be concluded.