Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2008.753.762LeuJai-HoungHuangJiunn-Shyan5200885A comparative assessment of the new droplet model including the multi-state behavior (MDCM4) is conducted using the droplet models which are currently available and have been applied in modern spray calculation. This investigation compares the trajectory, state transition, flame transformation and burn-out of a droplet which was injected into the combustion chamber with a known combustion flow structure. In order to represent droplet state quantitatively, an index of group combustion IGC is introduced. The state of evolution of a tested droplet is described by IGC along its trajectory. The results predicted by different droplet models show different characteristics which will ultimately influence the accuracy of the analysis of a spray combustion system. By analyzing the effects of different injection velocities and angles on the trajectory of the tested droplet, the validity of the new droplet model including the multi-state behavior (MDCM4) are examined by qualitatively comparing the results with experimental observation.]]>Asheim, J.P. and J.E. Peters,1989Bayson, F., W.H. Ayers, J. Swithenbank and Z. Pan,1982Chiu, H.H., H.Y. Kim and E.J. Croke,1982Chiu, H.H.,1993Chiu, H.H. and J.S. Huang,1996Chiu, H.H. and C.L. Lin,1996Chiu, H.H.,2000El-Banhawy, Y. and J.H. Whitelaw,1980Emmons, H.W.,1971Faeth, G.M.,1987Gollahalli, S.R. and T.A. Brzustowski,1973Gung, C. and A. Gomez,1997Huang, J.S. and H.H. Chiu,1997Huang, J.S. and H.H. Chiu,2008Jiang, T.L. and H.H. Chiu,1987Jiang, T.L. and H.H. Chiu,1992Jiang, T.L. and W.S. Hsu,1993Jiang, T.L., W.S. Chen, M.J. Tsai and H.H. Chiu,1995Law, C.K. and S.H. Chung,1980Leu, J.H. and W.J. Ho,1997Leu, J.H. and Y.C. Liu,2003Leu, J.H.,2008Mawid, M. and S.K. Aggarwal,1989McDonell, V.G., M. Adachi and Samuelsen,1993Sami, H. and M. Ogasawara,1970Spalding, D.B.,1953Suzuki, T. and H.H. Chiu,1971Udelson, D.G.,1962Weber, R., F. Boysan, J. Swithenbank, R. Bolado and A.Y. Yule,1987Yule, A.J. and R. Bolado,1984