Studi Numerik Pengaruh Sudut Kemiringan Push Nozzle pada Air Curtain Terhadap Pola Aliran Push-Pull Ventilation

Abstract

COVID-19 cases will continue to spread throughout the world until 2023, including in
Indonesia, and have many negative impacts, especially for the industrial world because it is difficult
to enforce a minimum distance of 1-2 meters between employees. One technology that has high
potential to be applied is the air curtain. This journal analyzes push-pull ventilation to protect
workers from microdroplet inhalation. In this study, two variations of the push-pull ventilation speed
ratio (Vs/Vb) were used, namely 4 and 6. As well as using a variation of the push nozzle slope, namely
10°. In this study, running was carried out with two models, namely modeling without a mannequin
and with a mannequin. To complete this research, simulations were carried out using the
Computational Fluid Dynamics (CFD) method using Salome, OpenFOAM, and ParaView software.
So, the results obtained in modeling without a mannequin, the speed ratio of 6 is the most optimal
ratio with the least amount of average discharge that goes out of bounds, namely 0.582 m3
/s. While
the results of the push-pull modeling with the mannequin show that no droplets penetrate the air
curtain at all variations of the velocity ratio, the velocity ratio of 6 is the velocity ratio that has a
over-blow flow pattern that is very effective in holding down spray from droplets.