Two-dye two-color laser-induced fluorescence spectroscopy on droplets of green solvent water/ethanol mixtures for thermometry and mixture composition

Ulrich, Hannah; Weiß, Richard; Zigan, Lars

doi:10.1007/s00348-024-03868-z

Cited by 3 publications

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

A fluorescence approach for assessing the composition of evaporating droplets

Stiti,

Wang,

Chaynes

et al. 2024

Applied Physics Letters

View full text Add to dashboard Cite

Accurate measurement of chemical composition is vital for understanding heat and mass transfer mechanisms in two-phase flows like sprays. This Letter presents an optical method based on laser-induced fluorescence and fluorescence lifetime measurement. While solvatochromism—shifts in the emission and absorption spectra based on solvent type that alter fluorescence intensity—is well-documented for many fluorescent dyes, fluorescence lifetime offers distinct advantages for two-phase flow applications. Unlike intensity-based methods, lifetime measurements exhibit greater resilience to light attenuation and scattering at liquid/gas interfaces and allow for more flexible detection band selection. The technique leverages the fluorescence lifetime of eosin Y, which is sensitive to solvent polarity while remaining unaffected by temperature—a crucial feature for systems with fluctuating temperature and composition. We validate this method using acoustically levitated droplets, showing that eosin Y's fluorescence lifetime can reliably distinguish components in binary mixtures like ethanol/water and isopropanol/water. The high volatility of ethanol and isopropanol causes significant cooling during droplet vaporization, leading to water condensation from the surrounding air. This approach enables detailed analysis of complex evaporation and condensation dynamics.

show abstract

A fluorescence approach for assessing the composition of evaporating droplets

Stiti,

Wang,

Chaynes

et al. 2024

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

Uncertainty Measurement of Two Color Two Dye Laser-Induced Fluorescence Thermometry and Application Thereof to Superheated Liquid Jet

Lee

2024

Preprint

View full text Add to dashboard Cite

Article Teasers

2024

Preprint

View full text Add to dashboard Cite

A meshless and binless approach to compute statistics in 3D ensemble PTV We propose a method to obtain super-resolution of turbulent statistics for three-dimensional ensemble particle tracking velocimetry (EPTV). The method is “meshless” because it does not require the definition of a grid for computing derivatives, and it is “binless” because it does not require the definition of bins to compute local statistics. The method combines the constrained radial basis function (RBF) formalism introduced Sperotto et al. (Meas Sci Technol 33:094005, 2022) with an ensemble trick for the RBF regression of flow statistics. The computational cost for the RBF regression is alleviated using the partition of unity method (PUM). Three test cases are considered: (1) a 1D illustrative problem on a Gaussian process, (2) a 3D synthetic test case reproducing a 3D jet-like flow, and (3) an experimental dataset collected for an underwater jet flow at Re= 6750 using a four-camera 3D PTV system. For each test case, the method performances are compared to traditional binning approaches such as Gaussian weighting (Agüí and Jiménez in JFM 185:447–468, 1987), local polynomial fitting (Agüera et al. in Meas Sci Technol 27:124011, 2016), as well as binned versions of RBFs Two-dye two-color LIF spectroscopy on droplets of water/ethanol mixtures for measurement of temperature and composition In this seminar we will present a two-color laser-induced-fluorescence (2c-LIF) technique based on a two-dye mixture, which is applied in a droplet chain of ethanol, water and ethanol/water mixtures. The technique is optimized in order to reach a high-temperature sensitivity and to avoid the detection of lasing effects in the droplets. Various droplet sizes are studied in regard to the limitation of the detection system for small micrometric droplets. The breakup of a liquid jet is analyzed to assess the technique in applications with liquid structures of different sizes. Additionally, a proposal is presented to expand the 2c-LIF application for studying ethanol/water droplets regarding mixture composition with a third color channel. Measurements in various ethanol/water mixtures are evaluated to show this possibility.

show abstract

Two-dye two-color laser-induced fluorescence spectroscopy on droplets of green solvent water/ethanol mixtures for thermometry and mixture composition

Cited by 3 publications

References 42 publications

A fluorescence approach for assessing the composition of evaporating droplets

A fluorescence approach for assessing the composition of evaporating droplets

Uncertainty Measurement of Two Color Two Dye Laser-Induced Fluorescence Thermometry and Application Thereof to Superheated Liquid Jet

Article Teasers

Contact Info

Product

Resources

About