A fast stroboscope photographic technique was used to investigate the mechanism of liquid sheet disintegration by acoustic perturbation and the effect of different fluid viscosities on disintegration. Acoustic modulation shortens the breakup length of a hollow-cone pressure-swirl spray. The mechanism of early breakup from modulation is attributed to waves imposed on the liquid sheet. The wavelength generated by the modulation was found to depend on the acoustic driving frequency. The experimental results indicated an optimum wavelength, for which the liquid breakup length is a minimum, appears in an acoustic modulated conical sheet disintegration. The optimum breakup length is at a driving frequency of 10 kHz, which is one of three resonant frequencies in our piezoelectric driver. Different viscosity fluids, v chemical bounds 1, 9.6, 14, and 50 cs, were used to examine the effect of viscosity on conical sheet disintegration. Increasing liquid viscosity hampers the spray development and lengthens the sheet disintegration. Acoustic modulation improves the disintegration in a higher viscous fluid but was less effective than in a lower viscosity fluid. A higher input modulated power enhances disintegration. The breakup length is inversely proportional to the logarithm of input power.
展开▼
