Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 37, Issue 3, Pages 3211-3218Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2018.09.026
Keywords
Phase rainbow refractometry; Droplet; Size change; Temperature; Evaporation rate
Funding
- Deutsche Forschungsgemeinschaft (DEG) within the priority program SPP 1980 SPRAYSYN [MA 3333/14-1]
- UK's Engineering and Physical Science Research Council [EP/K020528/1, EP/M009424/1]
- China Scholarship Council (CSC)
- EPSRC [EP/M009424/1, EP/K020528/1] Funding Source: UKRI
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Droplet evaporation characterization, although of great significance, is still challenging. The recently developed phase rainbow refractometry (PRR) is proposed as an approach to measuring the droplet temperature. size as well as evaporation rate simultaneously, and is applied to a single flowing n-heptane droplet produced by a droplet-on-demand generator. The changes of droplet temperature and evaporation rate after a transient spark heating are reflected in the time-resolved PRR image. Results show that droplet evaporation rate increases with temperature, from -1.28x 10(-8) m(2)/s at atmospheric 293 K to a range of (-1.5, -8) x 10(-8) m(2)/s when heated to (294, 315) K, agreeing well with the Maxwell and Stefan-Fuchs model predictions. Uncertainty analysis suggests that the main source is the indeterminate gradient inside droplet, resulting in an underestimation of droplet temperature and evaporation rate. With the demonstration on simultaneous measurements of droplet refractive index as well as droplet transient and local evaporation rate in this work, PRR is a promising tool to investigate single droplet evaporation in real engine conditions. (C) 2018 The Authors. Published by Elsevier Inc. on behalf of The Combustion Institute.
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