Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 64, Issue -, Pages 952-965Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2013.05.034
Keywords
Evaporation; Spray; Superheated; Optic; Acoustic
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Funding
- German Research Foundation (DFG) [SPP 1423]
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Applying the process of superheated atomization (flash atomization) finely dispersed sprays with moderate droplet velocities can be obtained, without the necessity of high pressure or an additional gas phase. In this paper occurring evaporation phenomena inside a nozzle capillary and their impact on the generated spray are analyzed. Evaporation is enhanced for increasing superheating. An intensified evaporation induces a considerably extended spray and smaller droplet sizes are generated. Furthermore a reduced mass flux and decreased velocity of the droplets are to be expected. By increasing the amount of vapor spray pulsation, triggered by bubble bursting, is increased. This is shown in acoustic measurements, which also demonstrate a simple way to monitor, or even control the atomization of superheated liquids. (C) 2013 Elsevier Ltd. All rights reserved.
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