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The purpose of this study is to develop the atomization enhancement nozzle, which is able to atomize high-visous liquid under low injection pressure from energy saving view point. In this paper, the effects of kinematic viscosity of the injection liquid and geometric shapes of nozzle on atomization of the spray and the spray characteristics were investigated experimentally. Kinematic viscosity was varied from 0.66×10-6 m2/s deserved kerosene and water to 20×10-6 m2/s deserved heavy oil at liquid temperature of 313 K. The spray characteristics of high-viscous liquid jet were measured in variation of the injection pressure up to 15 MPa. The results show that the spray, which spread of the spray is wide, the breakup length is short and Sauter mean diameter is small, was obtained, and atomization enhancement of high-viscous liquid jet is possible under low injection pressure. Moreover, almost the same spray characteristics were obtained independent of kinematic viscosity, using a nozzle improved a single hole nozzle.

Atomization of High-Viscous Liquid Jet by Cavitation in the Nozzle Hole