期刊
FUEL
卷 293, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.120323
关键词
Evaporation characteristics; Single droplet; Experimental parameter; Numerical study
资金
- China Postdoctoral Science Foundation [2019M652636]
- Postdoctoral Innovation Talents Support Program of China [BX20180111]
- National Natural Science Foundation of China [51676062]
- Fundamental Research Funds for the Central Universities of China [JZ2020HGTA0071]
The simulation researches the effect of experimental parameters on the evaporation characteristics of n-butanol-dodecane blends. Factors such as droplet diameter, wire diameter, junction diameter, ambient temperature, and n-butanol concentration all play significant roles in determining the equilibrium temperature and average evaporation rate. The study shows that both K-ave and T-equ exhibit complex variations with changes in these parameters, and a polynomial model can reasonably predict the normalized evaporation rate.
The simulation is used to research the effect of experimental parameters on evaporation characteristics of n-butanol-dodecane blends. These experimental parameters include droplet diameter, wire diameter, junction diameter, ambient temperature and n-butanol concentration. The equilibrium temperature (T-equ) slowly increases with time for the case with a thermocouple and it is nearly unchanged without a thermocouple. The change of droplet diameter at location 1# (D-1#, location 1# is the beginning of droplet motion) has little impact on T-equ for the case without a thermocouple. With increasing D-1#, the average evaporation rate (K-ave) increases with a thermocouple and it is nearly constant without a thermocouple. Both K-ave and T-equ firstly increase and then decrease with increasing wire diameter (D-wir) or junction diameter (D-jun). From 600 to 800 K, K-ave is the maximum when D-wir is 0.10 mm. The maximum is at Djun of 0.3 mm for 800 K and it is at 0.4 mm for 600 and 700 K. The change of D-wir or D-jun has little effects on T-2#, which is the droplet temperature at the location of 2# (location 2# is the end of droplet motion). Both T-2# and K-ave decrease with increasing n-butanol concentration. An obvious transition can be found for K-ave when the mass fraction of n-butanol ranges from 12.5% to 25%. The normalized evaporation rate is reasonably predicted using a polynomial model.
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