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Experimental study of induced flow around evaporating droplets in a high density environment
Radhakrishnan S., ,
Published in ILASS Europe, Institute for Liquid Atomization and Spray Systems
2015
Abstract
This experimental work investigates the evaporation rates of liquids (water, ethanol) and the flow induced thereby for both pendant and sessile droplets in high density ambient gas (sulfur hexafluoride). The flow induced around an evaporating droplet is studied at ambient pressure, in a sealed glass chamber. A steel needle and aluminium substrate are used for the pendant and sessile droplet study, respectively. The evaporation rates of the droplets are measured using shadow imaging technique. Particle image velocimetry (PIV) technique is used to measure the flow induced around the evaporating droplet. This flow is observed for both water and ethanol droplets. The flow moves upward for both pendant and sessile droplets of ethanol. In case of water, the pendant droplet induces a flow which is initially upward, but with time, its direction changes downward. The evaporation-induced flow for a sessile droplet of water is however always in the upward direction. This indicates the relative role of thermal and solutal buoyancy in the genesis of the flow. Droplet surface temperatures are also measured and discussed in this paper. © 2015 International Conference on Liquid Atomization and Spray Systems. All rights reserved.
About the journal
JournalICLASS 2015 - 13th International Conference on Liquid Atomization and Spray Systems
PublisherILASS Europe, Institute for Liquid Atomization and Spray Systems
Open AccessNo