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Effect of ambient temperature on the micro-explosion characteristics of soybean oil droplet: The phenomenon of evaporation induced vapor cloud
- Source :
- International Journal of Heat and Mass Transfer. 139:736-746
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Micro-explosion characteristics of soybean oil droplet were investigated using high speed backlight imaging technique at ambient temperature 873 K, 923 K and 973 K. Experimental results indicate that soybean oil droplet underwent transient heating phase, micro-explosion evaporation phase, equilibrium evaporation phase, and residue evaporation phase at all the studied temperatures. The evaporation rate of equilibrium evaporation phase is increased when the temperature increased. However, a decrease for the evaporation rate of residue evaporation phase. Homogeneous and heterogeneous nucleation are observed at all temperatures, homogeneous nucleation lead to strong micro-explosion and heterogeneous nucleation lead to weak micro-explosion. Moreover, micro-explosion strength increased when the ambient increased. It was found that the micro-explosion occurred at the end of droplet evaporation, this is one of the reasons for the poor atomization characteristics of bio-oil in the engine. More importantly, the evaporation induced vapor cloud is observed at 973 K, this is mainly due to the non-isothermal condensation caused by Stefan outflow.
- Subjects :
- Fluid Flow and Transfer Processes
Materials science
food.ingredient
020209 energy
Mechanical Engineering
Evaporation rate
Nucleation
02 engineering and technology
Vapor cloud
021001 nanoscience & nanotechnology
Condensed Matter Physics
Soybean oil
food
Chemical engineering
Homogeneous
Micro explosion
0202 electrical engineering, electronic engineering, information engineering
Outflow
0210 nano-technology
Droplet evaporation
Physics::Atmospheric and Oceanic Physics
Subjects
Details
- ISSN :
- 00179310
- Volume :
- 139
- Database :
- OpenAIRE
- Journal :
- International Journal of Heat and Mass Transfer
- Accession number :
- edsair.doi...........634cce560a07f65a9a95137c4e6281c2