对流传热基本计算式——牛顿(Newton)冷却公式(Newton‘s law of cooling)中的比例系数,以前又称为对流换热系数,是由流体内部各部分质点发生宏观运动而引起的热量传递过程,只能发生在有流体流动的场合单位是W/(㎡*K),含义是对流换热速率,反应了对流传热的快慢,对流传热系数越大,表示对流传热越快。对流传热系数分为局部总传热系数和总传热系数,总传热系数总是接近于α小的流体的对流传热系数。
当温度继续降低时,铸锭表面传热系数又迅速减小。
After that, the heat transfer coefficient is rapidly decreased with temperature decline.
提出了一种紧凑式换热器平均表面传热系数瞬变测试方法。
A transient testing technique for measuring average convection heat transfer coefficients of compact heat exchangers is suggested.
瞬态液晶技术用于复杂几何表面传热系数高分辨率的测量是成功的。
The method has been proved to be successful for high resolution measurements in internal heat transfer on surfaces with complex geometries.
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