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All Journal REKAYASA Infotekmesin Teknika STTKD: : Jurnal Teknik, Elektronik, Engine
Pisti Cikarge, Ghia
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Agriculture, Biological Sciences & Forestry Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Journal : Infotekmesin

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Pengaruh Ketebalan Orifis Terhadap Karakteristik Hidrodinamik Oksigen Terlarut pada Microbubble Generator Tipe Porous-Orifis Santoso, Agus; Ariawan, Radhi; Girawan, Bayu Aji; Pisti Cikarge, Ghia
Infotekmesin Vol 17 No 1 (2026): Infotekmesin: Januari 2026
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v17i1.3038

Abstract

This study aims to analyze the effect of orifice thickness on the performance of a porous-orifice microbubble generator (MBG) in aeration processes, particularly concerning the enhancement of dissolved oxygen (DO) concentration and the volumetric oxygen mass transfer coefficient (KLa). The primary issue identified is the limited number of studies that explicitly address the role of orifice thickness as a critical geometric parameter influencing microbubble formation and oxygen transfer efficiency. The research was conducted experimentally under controlled laboratory conditions using two orifice thickness variations, 1.5 mm and 9 mm, with different water and air flow rates, QL and QG. The findings reveal that increasing air flow rate (QG)  correlates positively with higher KLa values for both orifice types; however, the thinner orifice consistently demonstrates superior KLa performance. This behavior is attributed to a steeper pressure gradient and stronger shear forces that promote finer bubble fragmentation and greater gas–liquid interfacial area. Overall, the thin-orifice MBG proved more efficient in enhancing aeration performance compared to the thick-orifice configuration.
Co-Authors Agus Santoso Alfarizie, Tito Atmoko, Nugroho Tri Girawan, Bayu Aji Jamaldi, Agus Radhi Ariawan Suseno, Ibnu Ulikaryani, Ulikaryani Wijayanto, Hendi