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Article

Effect of Duct Inclination and Acoustic–Electrostatic Hybridization on Particle Removal in Low-Velocity Airflows: Experimental Analysis

by
Aleksandr Šabanovič
1,
Darius Vainorius
2,*,
Jonas Matijošius
2,
Artūras Kilikevičius
2 and
Benas Rimša
1
1
Department of Mechanical and Material Engineering, Faculty of Mechanics, Vilnius Gediminas Technical University-VILNIUS TECH, Plytinės str. 25, LT-10105 Vilnius, Lithuania
2
Mechanical Science Institute, Vilnius Gediminas Technical University-VILNIUS TECH, Plytinės str. 25, LT-10105 Vilnius, Lithuania
*
Author to whom correspondence should be addressed.
Appl. Sci. 2026, 16(12), 5982; https://doi.org/10.3390/app16125982 (registering DOI)
Submission received: 12 May 2026 / Revised: 29 May 2026 / Accepted: 10 June 2026 / Published: 12 June 2026

Abstract

This study examined how duct inclination influences particle removal in a hybrid acoustic–electrostatic filtration system operating at low airflow velocities. The experiments were carried out in a 150 mm diameter air duct at airflow speeds of 0.50 and 0.75 m/s, with duct inclinations of 45° and 90°. Aerosol particles with properties similar to marine diesel exhaust, spanning a size range of 0.2–10 µm, were introduced at stable concentrations. Electrostatic voltages of 17.5 and 20 kV were applied, together with acoustic voltages between 100 and 200 V. Particle removal was evaluated using both size-resolved and overall collection efficiencies. The results show that duct inclination mainly affects the removal of fine and medium-sized particles. The largest differences were observed for particles around 1 µm in diameter, where the vertical duct increased collection efficiency by up to 27 percentage points at an airflow speed of 0.75 m/s. For larger particles in the 5–10 µm size range, high removal efficiency was achieved under all tested conditions, and duct orientation had a smaller influence on collection performance. Overall, the results confirm that duct inclination has a clear and measurable effect on the performance of hybrid acoustic–electrostatic filtration systems operating at low airflow velocities.
Keywords: acoustic agglomeration; electrostatic precipitator; duct inclination effects; particle removal efficiency; gravitational settling; low-velocity airflows; ventilation ducts acoustic agglomeration; electrostatic precipitator; duct inclination effects; particle removal efficiency; gravitational settling; low-velocity airflows; ventilation ducts

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MDPI and ACS Style

Šabanovič, A.; Vainorius, D.; Matijošius, J.; Kilikevičius, A.; Rimša, B. Effect of Duct Inclination and Acoustic–Electrostatic Hybridization on Particle Removal in Low-Velocity Airflows: Experimental Analysis. Appl. Sci. 2026, 16, 5982. https://doi.org/10.3390/app16125982

AMA Style

Šabanovič A, Vainorius D, Matijošius J, Kilikevičius A, Rimša B. Effect of Duct Inclination and Acoustic–Electrostatic Hybridization on Particle Removal in Low-Velocity Airflows: Experimental Analysis. Applied Sciences. 2026; 16(12):5982. https://doi.org/10.3390/app16125982

Chicago/Turabian Style

Šabanovič, Aleksandr, Darius Vainorius, Jonas Matijošius, Artūras Kilikevičius, and Benas Rimša. 2026. "Effect of Duct Inclination and Acoustic–Electrostatic Hybridization on Particle Removal in Low-Velocity Airflows: Experimental Analysis" Applied Sciences 16, no. 12: 5982. https://doi.org/10.3390/app16125982

APA Style

Šabanovič, A., Vainorius, D., Matijošius, J., Kilikevičius, A., & Rimša, B. (2026). Effect of Duct Inclination and Acoustic–Electrostatic Hybridization on Particle Removal in Low-Velocity Airflows: Experimental Analysis. Applied Sciences, 16(12), 5982. https://doi.org/10.3390/app16125982

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