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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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Optimasi Media Pendingin untuk Meningkatkan Kekerasan Permukaan Baja Karbon Rendah melalui Proses Carburizing Pisti Cikarge, Ghia; Atmoko, Nugroho; Alfarizie, Tito; Wijayanto, Hendi; Suseno, Ibnu
Teknika STTKD: : Jurnal Teknik, Elektronik, Engine Vol 11 No 1 (2025): TEKNIKA STTKD: JURNAL TEKNIK, ELEKTRONIK, ENGINE
Publisher : Sekolah Tinggi Teknologi Kedirgantaraan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56521/teknika.v11i1.1502

Abstract

Carburizing is one of the most effective heat treatment methods to enhance the surface hardness of low-carbon steel by diffusing carbon atoms into the material's surface layer. The final characteristics of the carburized layer are strongly influenced by the quenching medium applied after the heating process. This study aims to analyze the effect of various quenching media on the microstructure and hardness of low-carbon steel specimens subjected to pack carburizing. The quenching media used include air, distilled water, and oil. Vickers hardness testing was conducted across the cross-section of the specimens, and microstructural characterization was performed using optical microscopy. The results show that air cooling produced a ferrite–pearlite structure with a diffusion layer thickness of approximately 188 µm and a hardness of 384 HV. Quenching with distilled water and oil resulted in a mixed structure of fine pearlite and partial martensite with hardness ranging from 780 to 820 HV. These findings indicate that oil is a promising alternative quenching medium for enhancing surface hardness without reducing the toughness of the core material.
Optimasi Kinerja Thermoelectric Generator (TEG) melalui Analisis Distribusi Kalor dan luaran Listrik dengan Variasi Sirip Penukar Panas Atmoko, Nugroho Tri; Jamaldi, Agus; Ulikaryani, Ulikaryani; Pisti Cikarge, Ghia
Rekayasa Vol 18, No 3: Desember, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i3.30546

Abstract

The utilization of waste heat from conventional gas stoves as electrical energy represents an effort to improve household energy efficiency. Thermoelectric generator (TEG) technology enables the direct conversion of thermal energy into electrical energy without moving components. This study aims to investigate the performance of TEGs in harnessing waste heat from gas stoves through the application of various heat-sink fin configurations to enhance thermal absorption. Three types of fins—long fins, short fins, and random fins—were employed as heat exchangers and mounted on a modified stove enclosure. Four TEG modules were connected in series and tested to measure operating temperatures and the resulting electrical output. The findings indicate that fin configuration significantly influences heat distribution and TEG performance. The random fin model demonstrated the highest heat absorption capability, reaching 94.112 J/s, thereby increasing the temperature gradient across the TEG modules. Consequently, the random fin model also produced the highest electrical output, generating 3.369 Watts, outperforming the other fin designs. These results highlight the critical role of fin geometry in optimizing heat transfer within TEG systems. In conclusion, the random fin configuration is the most effective heat exchanger design for TEG applications on gas stoves, as it enhances heat absorption efficiency and delivers greater electrical power output. This finding offers important potential for further development of self-sustaining energy systems in household appliances.
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