The traditional phase diagram of droplet impingement boiling on a heated substrate is drawn based on the boiling morphologies recorded with high-speed camera, which is useful to qualitatively determine the strength of droplet impingement heat transfer and the transition boundaries. However, the major shortcut of this method is that one cannot distinguish the heat transfer variation in the same region on phase diagram. To address this problem, this paper proposes a quantitative phase diagram which is determined with the measurements of temperature evolution in substrate. In the experiments, the two ends of a differential thermocouple are inserted in the substrate at different depth, and the recorded maximum temperature difference during the droplet impact is employed to quantify the intensity of heat transfer. Therefore, the contour of the maximum temperature difference in the space of the substrate temperature and the droplet Weber number provides a quantitative phase diagram. The comparisons of the two phase diagrams are conducted, and it shows that the new phase diagram could reveal richer information. For example, a second peak of the heat flux in the transition boiling could be observed under specific Weber numbers, which forms an island in the quantitative phase diagram. Finally, based on the captured images, the observed heat transfer characteristics were analyzed and explained.

传统的液滴撞击沸腾在加热基板上的相图是根据高速相机记录的沸腾形态绘制的，这有助于定性确定液滴撞击传热的强度和过渡边界。然而，这种方法的主要捷径是无法区分相图上同一区域的传热变化。为了解决这个问题，本文提出了一种定量相图，该相图是通过测量基材中的温度演变来确定的。实验中，将差动热电偶的两端插入基板不同深度，利用记录的液滴撞击过程中的最大温差来量化传热强度。所以，基板温度和液滴韦伯数空间中最大温差的轮廓提供了定量相图。对两个相图进行了比较，表明新的相图可以揭示更丰富的信息。例如，可以在特定的韦伯数下观察到转变沸腾中热通量的第二个峰值，这在定量相图中形成了一个岛。最后，基于捕获的图像，对观察到的传热特性进行了分析和解释。在特定的韦伯数下，可以观察到过渡沸腾中热通量的第二个峰值，这在定量相图中形成了一个岛。最后，基于捕获的图像，对观察到的传热特性进行了分析和解释。在特定的韦伯数下，可以观察到过渡沸腾中热通量的第二个峰值，这在定量相图中形成了一个岛。最后，基于捕获的图像，对观察到的传热特性进行了分析和解释。