ASABE Technical Library - Abstract

Abstract. Experiments and numerical simulation were carried out to investigate the jet breakup characteristics such as the core length and breakup length using a high-speed camera. The flow, ranges and ending raindrop diameters were measured and the empirical correlation between ending raindrop diameters and ambient pressure was developed by data fitting. The optimal geometric parameters of nozzle were obtained after comprehensively considering the factors. Based on photography technology, the effects of velocity and geometric parameters of the nozzle on jet breakup length were studied carefully. Two correlations were proposed based on the analysis of the effect of Re, We and Oh on the core length and breakup length. The experimental data agreed very well with the data from the computational fluid dynamics（CFD）by coupling the 3D incompressible RANS equations with level set method. Results showed that with the increase of Re and We, the core length increases firstly and then drops and the breakup length decreases, the simulation value was higher than the experimental data with an error of less than 5%. Therefore, the accuracy and reliability of the high speed photography (HSP) experiment and CFD result were both valid.