Laser-induced fluorescence of tracers dissolved in evaporating droplets

被引：0
|
作者：
I. Düwel
J. Schorr
J. Wolfrum
C. Schulz
机构：
[1] Universität Heidelberg,Physikalisch
来源：
Applied Physics B | 2004年 / 78卷
关键词：
Evaporation; Signal Intensity; Fluorescence Intensity; Rhodamine; Water Droplet;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Laser-induced fluorescence (LIF)-based spray volume and droplet-size measurements rely on assumptions about the evaporation or accumulation of fluorescent tracers during the evaporation of the droplets. We investigate the time-dependent variation of droplet-size and LIF signal intensity of CO2-laser-heated evaporating water droplets doped with rhodamine 6G. After an initial decrease of fluorescence intensity by 30% due to temperature-dependent diffusion of oxygen into the droplets, the LIF signal remains constant, indicating that the tracers have fully accumulated in the droplet. This evaporation-independent signal can be used as a reference for Mie-scattering-based droplet surface-area measurements that will allow the sensitive observation of spray evaporation and droplet breakup.
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页码：127 / 131
页数：4
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