Influence of nozzle area ratio on the gas-particle flow for single-hose dry ice blasting nozzle

In this paper, a numerical study was performed to examine the effect of divergent nozzle length of single-hose dry ice blasting on the development of acoustic power level. The active working medium is the mixture of solid dry ice particles and compressible air fluid at the inlet section. The two-dimensional planar model was solved using the finite volume method. The model has been verified theoretically by comparing to four different properties which are pressure ratio, density ratio, temperature ratio, and Mach number ratio over different nozzle area ratios (NARs). The results are presented in the quantitative and qualitative morphological views. The result shows that a more significant value of the NAR gives the highest value of velocity and acoustic power level along the nozzle cavity, of which 560 m s−1 and 146.2 dB, respectively. Besides, turbulence intensity is the most significant influencing factor for the acoustic power level development along the nozzle cavity since the trend of acoustic power level and turbulence intensity are the same. The characteristic of particle gas flow provides a novelty approach to determine the most significant influence factor of the performance and the noise emission