Nowadays, demand for more efficient energ y increased due to the green technology as one of the promin ent research areas. In order to improve the exhaust emission from the diesel engine, researchers have found an alter na tive fuel which known as water-in-dies el emulsion fucl. It is a promising way that could fulfill such demand because it can simultaneously reduce harmful emissions; Nitrogen Oxides, Particulate Matter and Hydrocarbon , and improve combustion efficiency of diesel engine. \V/D emulsion fuel is a mixture of water and diesel with the presence of surfactant. However, the stabili ty and high dependency of surfactant are the main concern in producing emulsion fuel. High cost of surfactant has restrained the emulsion fuel to be commercialized. Hence, with the aim to remove the dependency on surfactant to produce emulsion fuel, this research has been conducted in order to come out with a mixing system design which known as Real Time Emulsion Fuel Supply System (RTES). It is a machine that combin es two typ es of mixers; high shear mixer and ultrasonic mixer in one unit and able to emulsify the water and diesel fuel without adding any surfactant. Throughout the RTES design process, there are design objectives that are considered . Besides, there arc also some regul ations and constr aint that needs to be consider during the component selection
