Research on Spray Cooling Within Finite Volume Based on Eulerian-Lagrangian Method

Abstract

Abstract. The two cooling styles of spraying cooling and water jacket cooling were studied for exhaust gas of engine within water-collecting box (WCB). Based on Eulerian-Lagrangian method, the heat and mass transfer between exhaust gas and water droplets were solved. By comparing the general characteristic indexof six models with different tubes, the model with bended tubes is defined as the best model in which the length of outer tube is less than inner one. With the increase of water spraying flux, the gas temperature and the evaporation rate of water droplets tend to decrease. The decrease of gas temperature can be restrained by the phenomenon of "water assembled", after the spraying flux rise to a certain value with continued increase. Compared with the water jacket cooling, the spraying cooling has a high heat transfer coefficient and a low cooling water cost, as well as reduces the resistance lost of exhaust gas.