Monodisperse droplet heating and evaporation: Experimental study and modelling |
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| Authors: | C Maqua G Castanet F Grisch F Lemoine T Kristyadi SS Sazhin |
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| Affiliation: | 1. LEMTA, Nancy-Université, CNRS UMR 7563, 2, Avenue de la Forêt de Haye, BP 160, 54504 Vand?uvre-lès-Nancy, France;2. ONERA, Fort de Palaiseau, 91761 Palaiseau Cedex, France;3. School of Environment and Technology, Faculty of Science and Engineering, University of Brighton, Brighton, BN2 4GJ, UK;1. Sir Harry Ricardo Laboratories, Centre for Automotive Engineering, School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, UK;2. Low Temperature Department, Moscow Power Engineering Institute, Krasnokazarmennaya 14, Moscow 111250, Russia;1. Discipline of Chemical Engineering, School of Engineering, University of Newcastle, NSW 2308, Australia;2. Danang University of Science and Technology – The University of Danang, 54 Nguyen Luong Bang, Danang, Viet Nam;3. Department of Chemical Engineering, Louisiana State University, USA;4. Department of Chemical Engineering, Curtin University, Perth, WA 6102, Australia;5. Homi Bhabha National Institute, Mumbai 400094, India;1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, 430074, China;2. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China |
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| Abstract: | Results of experimental studies and the modelling of heating and evaporation of monodisperse ethanol and acetone droplets in two regimes are presented. Firstly, pure heating and evaporation of droplets in a flow of air of prescribed temperature are considered. Secondly, droplet heating and evaporation in a flame produced by previously injected combusting droplets are studied. The phase Doppler anemometry technique is used for droplet velocity and size measurements. Two-colour laser induced fluorescence thermometry is used to estimate droplet temperatures. The experiments have been performed for various distances between droplets and various initial droplet radii and velocities. The experimental data have been compared with the results of modelling, based on given gas temperatures, measured by coherent anti-stokes Raman spectroscopy, and Nusselt and Sherwood numbers calculated using measured values of droplet relative velocities. When estimating the latter numbers the finite distance between droplets was taken into account. The model is based on the assumption that droplets are spherically symmetrical, but takes into account the radial distribution of temperature inside droplets. It is pointed out that for relatively small droplets (initial radii about 65 μm) the experimentally measured droplet temperatures are close to the predicted average droplet temperatures, while for larger droplets (initial radii about 120 μm) the experimentally measured droplet temperatures are close to the temperatures predicted at the centre of the droplets. |
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