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本文是在喷雾条件下,通过红外热成像可视化技术,对矩形毛细微槽群表面以及光滑表面热沉的换热过程进行可视化研究。与传统的接触式测温手段相比,红外热成像技术能直观地反映整个局部范围内的温度分布,对进一步研究各种参数对喷雾冷却换热的影响提供了更好的实验基础。结果表明,随热流密度的增加,发现最先开始出现干涸现象是在热沉表面中心,即喷嘴正下方;在毛细微槽群热沉表面上当出现相变过度时,随着矩形微槽内气泡数量的增加,加热表面的液体温度有所下降;表面中心出现干涸初期,干涸区域的温度剧降,但干涸区域加大时其表面温度上升,换热特性进入临界点。
In this paper, visualization of the heat transfer process of rectangular capillary microgrooves and smooth surface heat sinks is carried out by means of infrared thermography visualization technology under the spray conditions. Compared with the traditional contact temperature measurement, the infrared thermography can intuitively reflect the temperature distribution in the entire local area, which provides a better experimental basis for further study on the influence of various parameters on the spray cooling heat transfer. The results show that with the increase of heat flux density, it is found that the dry-up occurs first at the center of the heat sink surface, just below the nozzle. When the phase transition occurs on the heat sink surface of the capillary microgroove group, The increase of the number of the heating surface of the liquid temperature decreased; dry surface at the beginning of the center, the dry area temperature dropped sharply, but the dry area increases when the surface temperature rises, the heat transfer characteristics of the critical point.