The multifractal nature of drop breakup in air-blast nozzle atomizationprocess has been studied. We apply the multiplier method to extract thenegative and the positive parts of the f(alpha) curve with the data of dropsize distribution measured using Dual PDA. A random multifractal model with themultiplier triangularly distributed is proposed to characterize the breakup ofdrops. The agreement of the left part of the multifractal spectra between theexperimental result and the model is remarkable. The cause of the distinctionof the right part of the f(alpha) curve is argued. The fact that negativedimensions arise in the current system means that the spatial distribution ofthe drops yielded by the high-speed jet fluctuates from sample to sample. Onother words, the spatial concentration distribution of the disperse phase inthe spray zone fluctuates momentarily showing intrinsic randomness.
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