Experimental study on eliminating fire smoke by using acoustic agglomeration coupled with water mist

In this paper, the elimination effect of the acoustic agglomeration technology by acoustic wave coupling water mist on carbon black aerosol is studied through experiments. The results show that the aerosol dispersion is improved by this technology, the liquid bridge force generated by the water mist ensures the stability of the agglomerate structure, and the number of smoke particles decreases by more than 80% at the frequency of 1.5 kHz, sound power of 10 W, initial carbon black aerosol concentration of 50 g·m^-3 and water mist concentration of 30 g·m^-3. The relative entrainment coefficient between particles increases and the relative motion enhances after adding water mist, meanwhile the best agglomeration frequency range is extended and the transmittance reaches up to 95.1%. However, the excessive concentration of water mist may block the light due to scattering and absorption. In addition, it is found that the agglomeration rate of thick aerosol is much higher than that of thin aerosol. This technology is more suitable for occasions with high aerosol concentration.