Asian Journal of Applied Sciences1996-3343xxxx-xxxxKnowledgia Review10.3923/ajaps.2017.88.95WahhabHasanain A. Abdul IsmaelMahdi A. AzizA. Rashid A. HeikalMorgan R. Al-KayiemHussain H. 22017102Background and Objective: Using Natural Gas (NG) for combustion process modification in compression ignition engines is considered to be a promising method due to its high volumetric efficiency, high thermal efficiency and low emissions. However, the natural gas has a penalty in terms of how to be involved in a combustion process due to its high auto-ignition temperature and lower cetane number. This study is a numerical investigation of the steady spray characteristics of diesel fuel containing dissolved natural gas. Materials and Methods: The simulation was carried out using ANSYS fluent software and a standard k-ε model was chosen with heat transfer condition at 300 K. The effect of natural gas concentration of 0, 5, 10 and 15% by mass in the diesel fuel on the spray characteristics for a typical diesel engine was studied numerically. A high pressure common rail injector with pressure of 200, 500 and 600 bar was investigated. Results: The results showed that the spray tip velocities increased with the increase in the natural gas concentration and injection pressure, while the spray cone angle of diesel-NG were smaller compared to that of pure diesel at the same conditions. Conclusion: The K-ε model of turbulence was successfully used to evaluate the spray characteristics and the results were compared to the some of the experimental data.]]>Hassan, M.K., I. Aris, S. Mahmod and R. Sidek,200925405416Ismael, M.A., M.R. Heikal and M.B. Baharom,20142014Rahman, M.M., M.K. Mohammed and R.A. Bakar,2009911281134Abdul-Wahhab, H.A., A.R.A. Aziz, H.H. Al-Kayiem and M.S. Nasif,20152015Abdul-Wahhab, H.A., A.R.A. Aziz, H.H. Al-Kayiem and M.S. Nasif,201710389396Zhang, J., D. Jiang, Z. Huang, T. Obokata, S. Shiga and M. Araki,20051920502055Ismael, M.A., M.R. Heikal and M.B. Bahroom,20153145151Brown, B.S., C.A. Laforet, S.N. Rogak and S.R. Munsh,201112109122Zamani, H., V. Hosseini, H. Afshin, L. Allocca and M. Baloo,2016910131022Pandey, K.M., S. Roga and G. Choubey,2016912151220Tonini, S., M. Gavaises, A. Theodorakakos and G.E. Cossali,2010224125141Som, S., S.K. Aggarwal, E.M. El-Hannouny and D.E. Longman,20102010Abdullah, S., W.H. Kurniawan and A. Shamsudeen,200816586Lee, W.G. and R.D. Reitz,20102010De Risi, A., G. Colangelo and D. Laforgia,20002000Taskiran, O.O. and M. Ergeneman,20112011Agarwal, A.K., V. Chaudhury, A. Agarwal and P.C. Shukla,201317217232Xie, H., L. Song, Y. Xie, D. Pi, C. Shao and Q. Lin,2015859525972Huo, M., S. Lin, H. Liu and C.F.F. Lee,2014123218229Lee, S.W., D.S. Baik, T. Rogers and P. Petersen,20147221232Wang, Z., X. Chen, D. Vuilleumier, S. Huang and J. Tang,201626513533