不同倾角下的微环境结霜试验研究

Experimental study on micro environment frosting under different inclination angles

通过改变微环境保温箱内放置的可旋转冷台的旋转角度(θ=0°、15°、30°、60°),使用恒温恒湿箱控制微环境温湿度,利用3D数字视频显微镜观察冷台上方的微型换热器表面,得到了在不同重力势场下可视化的液滴冷凝结霜过程、液滴数量分布情况。并通过实验数据间接分析了不同重力势场对微型换热器换热性能的影响。结果表明:随着倾角增大,霜层结构更疏松有序、生长更缓慢。倾角为60℃时,霜层更利于换热与除霜,换热器的换热效率更好。

In this paper, by changing the rotation angle of the rotatable cooling table placed in the micro environment incubator(θ=0°, 15°, 30°and 60°), the temperature and humidity of the microenvironment were controlled by the constant temperature and humidity box, and the surface of the micro heat exchanger above the cooling table was observed by 3 D digital video microscope, and the droplet condensation and frosting process and droplet number distribution under different gravity potential fields were obtained. The influence of different gravity potential fields on the heat transfer performance of the micro heat exchanger was analyzed indirectly through the experimental data. The results show that with the increase of inclination angle, the frost structure is more loose and orderly, and the growth is slower. When the inclination angle is 60 ℃, the frost layer is more conducive to heat transfer and defrosting, and the heat transfer efficiency of the heat exchanger is better.