TY - JOUR
TI - Development of a simplified model for droplet vaporization
AU - Xiao Helin
AU - Zhao Liangrui
AU - Li Zhongzhao
AU - Wei Mingrui
AU - Guo Guanlun
JN - Thermal Science
PY - 2016
VL - 20
IS - 1
SP - 337
EP - 345
PT - Article
AB - Droplet vaporization is an essential sub-process of fuel spray in diesel  engines，which has important effects on combustion and emissions performance.  Development of a simplified droplet vaporization model is necessary to  simulate gas mixture formation in cylinder for lower computational costs, and  it is also applicable in practical multi-dimension spray calculations for  diesel engines. An empirical exponential equation is introduced in this paper  to approximate the internal temperature profile of droplet instead of solving  the partial differential equation for temperature distribution. Results  indicate that the computational cost has been reduced by almost thirty  percent in total. Also, the concept of effective diffusion is introduced by  using an enlarged diffusivity to take account of the effect of internal  circulations inside droplets. The calculated result of the simplified  evaporation model has been compared with that of the infinite diffusivity  model and one-dimensional model respectively. It shows that the calculation  precision of the simplified model is among those two models.