Moreover, water addition probably affects the combustion process in many ways. The reduction in temperature
due to water evaporation and the increased specific heat of the charge may reduce the soot oxidation process [16]. Diesel fuel is injected into homogenous water vapor–air mixture and microexplosions of water vapor near diesel fuel may help to mix diesel fuel and air fastly. It is well known that combustion process in a diesel engine is controlled by fast and homogenous mixing DF with air [25].