Antonov Dmitry, Volkov Roman, Strizhak Pavel
Power Engineering Institute, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia.
Entropy (Basel). 2019 Aug 16;21(8):803. doi: 10.3390/e21080803.
Mathematical modeling of the heat and mass transfer processes in the evaporating droplet-high-temperature gas medium system is difficult due to the need to describe the dynamics of the formation of the quasi-steady temperature field of evaporating droplets, as well as of a gas-vapor buffer layer around them and in their trace during evaporation in high-temperature gas flows. We used planar laser-induced fluorescence (PLIF) and laser-induced phosphorescence (LIP). The experiments were conducted with water droplets (initial radius 1-2 mm) heated in a hot air flow (temperature 20-500 °C, velocity 0.5-6 m/s). Unsteady temperature fields of water droplets and the gas-vapor mixture around them were recorded. High inhomogeneity of temperature fields under study has been validated. To determine the temperature in the so called dead zones, we solved the problem of heat transfer, in which the temperature in boundary conditions was set on the basis of experimental values.
在蒸发液滴 - 高温气体介质系统中，对传热传质过程进行数学建模具有难度，这是因为需要描述蒸发液滴准稳态温度场的形成动态，以及高温气流中蒸发过程中液滴周围及其轨迹处气 - 汽缓冲层的形成动态。我们使用了平面激光诱导荧光（PLIF）和激光诱导磷光（LIP）技术。实验采用在热气流（温度20 - 500°C，速度0.5 - 6 m/s）中加热的水滴（初始半径1 - 2 mm）进行。记录了水滴及其周围气 - 汽混合物的非稳态温度场。已验证所研究温度场的高度不均匀性。为了确定所谓死区内的温度，我们求解了传热问题，其中边界条件中的温度是根据实验值设定的。
