Diffusion coefficient of water in nitrogen (D_vg) is a critical thermophysical parameter. However, the widely used empirical parametrizations of D_vg are only applicable in the temperature range from 273 K to 373 K. In the supercooled range, the reported experimental values of D_vg is sparse, and D_vg varies with temperature in a way different from the empirical equations and the recently reported first-principles calculation. In this paper, D_vg values at given temperatures, including in the supercooled range, were determined using the evaporation kinetics of individual water droplets in nitrogen flow under well-controlled conditions. The KVH model capable of describing the rapid evaporation/condensation process of an individual water droplet was utilized, and the thermophysical/kinetic parameters were evaluated carefully. Through reviewing the literature values of mass accommodation coefficient (α_M) for ice, ice with liquid-like layer, supercooled water, normal water, and hot water, it is observed that the Slogistic1 function presented by OriginPro® could describe the temperature dependence of α_M well. Then, the radius vs. time curve of an individual water droplet was predicted from the KVH model by varying D_vg and then compared with the experimental curve recorded by the Electrodynamic Balance. The trial value of D_vg corresponding to the best agreement was treated as its experimental value. By reviewing and regression fitting of all available experimental data, an improved expression of D_vg is proposed. The accuracy is evaluated to be ± 4 % in the temperature range of 248 K to 600 K.

水在氮中的扩散系数（D _vg）是关键的热物理参数。但是，广泛使用的D _vg经验参数化仅适用于273 K至373 K的温度范围。在过冷范围内，D _vg的报告实验值稀疏，并且D _vg随温度变化的方式不同于经验方程式和最近报道的第一性原理计算。在本文中，D _vg在给定温度下（包括过冷范围内），在良好控制的条件下，使用氮气流中单个水滴的蒸发动力学来确定温度值。利用能够描述单个水滴快速蒸发/冷凝过程的KVH模型，并仔细评估了热物理/动力学参数。通过回顾质量调节系数（的文献值α_中号为冰），冰与液体状的层，过冷水，正常水和热水，可以观察到，通过OriginPro®呈现的Slogistic1函数可以描述的温度依赖性α_中号出色地。然后，通过改变D _vg，从KVH模型预测单个水滴的半径与时间的关系曲线，然后将其与电动平衡记录的实验曲线进行比较。将与最佳协议相对应的D _vg的试验值作为其实验值。通过审查和回归拟合所有可用的实验数据，提出了改进的D _vg表达。在248 K至600 K的温度范围内，精度评估为±4％。