Issue 24, 2006

Measuring temperature gradients in evaporating multicomponent alcohol/water droplets

Abstract

We demonstrate that temperature gradients can be investigated in evaporating volatile water/alcohol droplets by characterising the volume averaged temperature by laser induced fluorescence and the near-surface temperature by cavity enhanced Raman scattering. In the former technique, the fluorescence spectrum from Rhodamine B can be used to determine the droplet temperature with an accuracy of ±1 K. The latter technique uses the band width of the OH stretching Raman band to determine the temperature change within the near-surface volume in which whispering gallery modes propagate with an accuracy of ±4 K. We demonstrate that the temperatures measured with varying evaporation time, buffer gas pressure, droplet size and composition are consistent with the predictions from a quasi-steady theoretical treatment of the evaporation rate and can be used to investigate temperature gradients within evaporating droplets.

Graphical abstract: Measuring temperature gradients in evaporating multicomponent alcohol/water droplets

Article information

Article type
Paper
Submitted
13 Jan 2006
Accepted
12 May 2006
First published
24 May 2006

Phys. Chem. Chem. Phys., 2006,8, 2879-2888

Measuring temperature gradients in evaporating multicomponent alcohol/water droplets

R. J. Hopkins, C. R. Howle and J. P. Reid, Phys. Chem. Chem. Phys., 2006, 8, 2879 DOI: 10.1039/B600530F

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