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本文对电加热水平圆管及纵向双肋管外的熔化换热及固-液界面运动规律进行了实验研究,用激光阴影技术测定了加热表面处的局部换热系数,以热平衡法确定了平均换热系数。通过摄取的熔化形状图计算相对工质熔化量随时间的变化规律,用当量平均熔化层厚度的概念描述了固-液界面的运动规律及平均换热特性。相变工质为色标十七烷(纯度>99.9％,t_f=22.2℃)。与光管相比,纵向双肋管增大了工质的熔化量,强化了熔化换热过程。
In this paper, the heat transfer and the movement of the solid-liquid interface outside the tube were studied experimentally. The laser heat shadowing technique was used to determine the local heat transfer coefficient. The average heat transfer coefficient Heat transfer coefficient. According to the change of the melting amount of the relative working fluid with time, the concept of equivalent average melting layer thickness was used to describe the movement law and the average heat transfer characteristics of the solid-liquid interface. Phase change working substance is the color standard heptadecane (purity> 99.9%, t_f = 22.2 ℃). Compared with the light pipe, the longitudinal ribbed tube increases the amount of melting of the working fluid and strengthens the heat transfer process.