Experimental research on breakup of 2D power law liquid film

On account of limited knowledge of the breakup of power law liquid film, the process of its disintegration and atomization was studied by using a planar liquid film. A linear stability analysis was adopted to predict the breakup characteristics of the power law film. The predicting formulas of stripping breakup length and diameter of ligament were put forward presently. Through high-speed photography and laser light sheet illumination, different breakup characteristics of flat power law film under different conditions were derived. The characteristic dimension of breakup regimes were defined and extracted. The effects of several parameters (injection pressure, ambient pressure, nozzle structure and fluid property) on the stripping breakup length and spray angle were investigated. The results revealed that increasing both the velocity of liquid film and the ambient pressure facilitated the breakup of film, reduced the stripping breakup length and enlarged the spray angle in different extents. The comparison between theoretical and experimental results was conducted to validate the feasibility of the linear stability theory.

The process of disintegration and atomization about the non-Newtonian film was studied by using a flat liquid film. A linear stability analysis was adopted to predict the breakup characteristics of the power law flow. The predictor formula of stripping breakup length as well as diameter of ligament was put forward. Through high-speed photograph method and laser light sheet illumination, different breakup characters of power law film under different parameters were derived. The characteristic dimension of breakup regimes were defined and extracted. The effects of several parameters namely the injection pressure, the ambient pressure, the nozzle structure and the fluid property on the stripping breakup length as well as the spray angle were investigated.Figure optionsDownload as PowerPoint slide