Journal
EXPERIMENTAL THERMAL AND FLUID SCIENCE
Volume 30, Issue 5, Pages 463-472Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2005.09.006
Keywords
microstructured reactor; falling film; liquid film thickness measurement
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Reflection confocal microscopy was used to measure the thicknesses of falling thin films generated using microstructured plates. Each plate contained straight parallel channels through which liquid fell vertically under gravity. Three different channel dimensions were used: 300 x 100 mu m, 600 x 200 mu m and 1200 x 400 mu m (width x depth). Measurements were performed for acetone, ethanol and isopropanol and gave reasonable agreement with theoretical predictions and correlations from the literature. Discrepancies were attributed to the fact that these equations do not consider parameters that affect three-phase contact lines such as surface tension and contact angle. No trend of film thickness on channel width was observed and was probably due to different surface heterogeneity and roughness characteristics amongst the plates. Measurement difficulties were encountered at low liquid film thicknesses and where the angle of the liquid meniscus was too steep. (C) 2005 Elsevier Inc. All rights reserved.
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