Institute of Applied Physics, Technische Universität Darmstadt, Hochschulstr. 6, 64289 Darmstadt, Germany.
Phys Chem Chem Phys. 2009 Nov 14;11(42):9720-8. doi: 10.1039/b908555f. Epub 2009 Sep 2.
The evaporation dynamics of stationary water droplets held within an electrodynamic trap are investigated in a nitrogen flow of variable velocity. In particular, the influence of the nitrogen gas flow on the temperature of the evaporating water droplets is studied. By applying a contact free measurement technique, based on spontaneous Raman scattering, time averaged and time resolved measurements of temperature in the droplet volume are compared. This technique determines the temperature from an intensity ratio in the OH stretching band of the Stokes-Raman scattering after calibration. The measured trends in temperature over the first 5 s of evaporation are found to be in agreement with theoretical calculations of the heat and mass transfer rates.
在可变速度的氮气流中，研究了静电场阱中固定水滴的蒸发动力学。特别是，研究了氮气流对蒸发水滴温度的影响。通过应用基于自发拉曼散射的无接触测量技术，对液滴体积中的温度进行了时间平均和时间分辨测量。该技术通过在斯托克斯-拉曼散射的 OH 伸缩带中进行强度比校准来确定温度。在蒸发的最初 5 秒内，测量的温度趋势与传热和传质速率的理论计算相符。
