Abstract
The purpose of this study is to clarify the effect of liquid viscosity on the Sauter mean diameter and the spray angle. The spray injected by a diesel nozzle of hole type was observed by the laser diffraction technique system and the direct photography method. The tests were carried out over a wide range of injection pressures and viscosities of glycerine solution at ambient pressure of 3 MPa. With an increasing liquid viscosity, the spray angle decreases and the Sauter mean diameter gradually increases. With further increase of the Viscosity, the Sauter mean diameter suddenly increases. There is an upper limit of the viscosity to be atomized as a spray of fine droplets. At a high injection pressure, the effect of viscosity on the Sauter mean diameter still remains but the viscosity has no effect on the spray angle.
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