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首页> 外文期刊>International Journal of Multiphase Flow >Drop formation mechanisms and size distributions for spray plate nozzles
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Drop formation mechanisms and size distributions for spray plate nozzles

机译：喷雾板喷嘴的液滴形成机理和尺寸分布

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This article describes the results of an experimental investigation of drop formation mechanisms and drop diameter distributions for spray plate nozzles. Spray plate nozzles are comprised of a distribution nozzle which projects a high velocity jet of water concentric on a plate. The resultant water film flows radially outward on the plate and breaks into drops after the liquid detaches from the plate and flows outward as a sheet. The drop size distribution is determined by a balance between shear forces with air and flow instabilities and turbulence in the liquid sheet flow, which tend to fracture the liquid sheet and drops, and surface tension forces, which tend to hold the liquid sheet and drops together. Experimental results include short duration photographs of nozzle jet flow, liquid film flow, and of water drop formation. Drop diameter distributions were obtained with a phase Doppler particle analyzer (PDPA). The variations of drop mean diameter, volumetric mean and Sauter mean diameters as functions of pressure, distribution nozzle-to-plate distance, and plate diameter are quantified.
机译：本文介绍了喷雾板喷嘴的液滴形成机理和液滴直径分布的实验研究结果。喷雾板喷嘴由分配喷嘴组成，该分配喷嘴将同心的高速水射流喷射到板上。所得的水膜在板上径向向外流动，并在液体从板上分离后破裂成液滴，并以片状形式向外流动。液滴的大小分布是由空气的剪切力与液面流动中的流动不稳定性和湍流之间的平衡所决定的，液面流动容易使液膜破裂并掉落，而表面张力则倾向于使液面和液滴保持在一起。实验结果包括喷嘴喷流，液膜流和水滴形成的短时照片。液滴直径分布是使用相位多普勒颗粒分析仪（PDPA）获得的。定量了液滴平均直径，体积平均直径和索特平均直径随压力，喷嘴到板的分布距离和板直径的变化。

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