Premium
Simultaneous determination of the composition and temperature gradients in the vicinity of boiling bubbles in liquid binary mixtures using one‐dimensional Raman measurements
Author(s) -
Knauer O. S.,
Lang M. C.,
Braeuer A.,
Leipertz A.
Publication year - 2011
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2689
Subject(s) - boiling , raman spectroscopy , chemistry , bubble , analytical chemistry (journal) , composition (language) , nucleate boiling , heat transfer , thermodynamics , chromatography , optics , heat transfer coefficient , organic chemistry , mechanics , physics , linguistics , philosophy
The ability to transport large quantities of heat by nucleate boiling is reduced for mixtures compared to their pure components. To study the heat and mass transfer during the boiling process, a one‐dimensional Raman spectroscopy setup was applied to measure, for the first time to the best of our knowledge, the composition and temperature gradients in the vicinity of single boiling bubbles of a mixture of acetone and isopropanol. A novel evaluation strategy allowed the simultaneous detection of the mixture composition and temperature from the CH and the OH Raman spectra. The composition gradients arise because of rectification effects, which cause unlike compositions in the gas and liquid phases. Heat transfer from the boiling bubble to the surrounding liquid induces temperature gradients. High temporal and spatial resolution measurements using an imaging spectrograph and an electron multiplying charge‐coupled device camera revealed large composition and temperature gradients with similar shapes. The accuracy of the composition results was validated by a species conservation calculation. Copyright © 2010 John Wiley & Sons, Ltd.