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影响对流传热的因素有哪些?

问答题
2022-01-02 03:26
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正确答案

(1)流体流动方式。强制对流使流体的流速高,放热好,自然对流流速低,当然放热不好。
(2)流体有无相态变化。对同一种流体有相变时的对流放热比无相变时来得强烈。
(3)流体的流动状态。对同一种流体,紊流时的放热系数比层流高。
(4)几何因素。流体所能触及的固体表面的几何形状、大小及流体与固体表面间的相对位置。
(5)流体的物理性质。如比重、比热、动力黏性系数、体积膨胀系数、汽化潜热等。


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