Investigation of the efficiency of the lateral exhaust hood enhanced by aeroacoustic air flow

Abstract

This paper presents a novel concept of local push-pull ventilation system used to removeaerosol particles from open surface tanks. Sound waves generated by aerodynamic soundgenerator are introduced into the push air flow of lateral exhaust hood and used toagglomerate aerosol particles. Results of calculation of parameters of sound generator andaeroacoustic air flow are presented. It is established that 5–10 μm aerosol particles areaggregated better at frequencies below the ultrasonic range (1–5 kHz) and aerosols witha particle size of less than 5 μm are more effectively aggregated at ultrasonic frequencies. Itwas experimentally established that the relative air humidity measured above open surfacetank is decreased up to 1.6 times in presence of acoustic field as compared with humidityobtained for conventional push-pull air removal system. It is also obtained that increaseof the temperature of the liquid increases the aerosol removal efficiency of lateral exhausthood enhanced by aeroacoustic air flow.