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All Journal Rekayasa Mesin Turbo : Jurnal Program Studi Teknik Mesin Jurnal AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Jurnal Teknik Mesin Dharma Raflesia : Jurnal Ilmiah Pengembangan dan Penerapan IPTEKS Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin
Yovan Witanto
Program Studi Teknik Mesin, Fakultas Teknik Universitas Bengkulu
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Control & Systems Engineering Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Analisis Distribusi Termal Model Tabung Rheology Test Apparatus Sebagai Media Pengujian Ultrafine Bubbles (UFBs) Nopriani, Meti Eliza; Puspawan, Angky; Witanto, Yovan; Budiman, Arif Adtyas
Jurnal Teknik Mesin Vol 18 No 1 (2025): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.18.1.1759

Abstract

The Fukushima Daiichi nuclear reactor accident has become a major concern in the development of safety design for advanced nuclear reactors. The reactor coolant system is part of the passive safety system, including the containment or reactor building cooling system. This system is designed to prevent damage to the reactor vessel structure and concrete building materials due to excessive heat release into the environment. The coolant flow is designed to move naturally without the help of a pump, utilizing the difference in fluid density as the main driver. The type of coolant plays a major role in generating the flow, especially in terms of its density properties. Fluids with a lower density than water can produce faster flow. One method to reduce the density of water is to insert fine bubbles known as ultrafine bubbles (UFB). To study the thermal characteristics of the fluid when heated, the Rheology Test Apparatus device is used. This study specifically examines the Rheology tube model. Analysis of temperature distribution in the tube is carried out using Computational Fluid Dynamics (CFD) simulations to understand the heat transfer mechanism. The validation process was carried out through experiments at a fluid temperature of 90°C, with a comparison of the temperatures at two points in the height of the tube, namely 0.16m and 0.8m, which are the locations of the heater and show the highest temperature.
AnalisisEffect of Ethanol–LPG Dual Fuel on Output Voltage Stability of a Four-Stroke Generator Witanto, Yovan; Nuramal, Agus; Pratama, Samuel Yoga; Helmizar, Helmizar; Rosa, Khairul Amri
TURBO [Tulisan Riset Berbasis Online] Vol 14, No 1 (2025): TURBO : Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i1.3767

Abstract

 This study aims to analyze the effect of load variation on the output voltage of a modified four-stroke generator using a dual-fuel system consisting of ethanol and liquefied petroleum gas (LPG). Ethanol 96% was used as the primary fuel, while LPG was injected through an ideal mixture screw with the aid of a converter kit, pressure regulator, and flowmeter to control gas flow. The test subject was a modified Yasuka 1500DC gasoline generator. Experiments were conducted using incandescent lamp loads ranging from 200 to 1000 watts, in 200-watt intervals, each applied for 2 minutes at a constant engine speed. The observed parameters included fuel consumption and output voltage. The LPG flow rates tested were 0.2, 0.4, 0.6, and 0.8 liters per minute. The results showed that the ethanol–LPG combination at a flow rate of 0.8 l/min produced the highest and most stable voltage output, remaining above the safe threshold of 198 volts. Compared to pure ethanol or gasoline, the dual-fuel system was more effective in maintaining voltage under high load conditions. This is attributed to LPG’s high calorific value and its ease of mixing with air, which enhances combustion quality. 
Pengaruh Campuran LPG Dan Udara Terhadap Kemudahan Penyalaan Awal Genset 4 Langkah Witanto, Yovan; Nuramal, Agus; Rosa, M. Khairul Amri
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol. 8 No. 2 (2022)
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/ame.v8i2.7095

Abstract

Selain sebagai bahan bakar kompor gas, Liquefied Petroleum Gas (LPG)  dapat dimanfaatkan sebagai bahan bakar genset. Untuk kemudahan penyalaan genset yang menggunakan LPG, diperlukan campuran LPG dan udara yang tepat. Tujuan penelitian ini yakni menganalisis pengaruh campuran LPG dan udara terhadap kemudahan penyalaan awal genset 4 langkah.  Metode yang digunakan dalam penelitian ini adalah metode eksperimen, yaitu menguji pengaruh variasi laju aliran gas LPG  dan  pengaruh variasi  bukaan katup saluran udara. Laju aliran LPG yang digunakan yakni 2 L/min, 3 L/min, 4 L/min. Udara yang masuk keruang bakar divariasikan dengan pengaturan bukaan katup yakni katup terbuka penuh, terbuka setengah dan tertutup rapat.  Hasil penelitian menunjukkan bahwa campuran yang paling tepat untuk kemudahan penyalaan awal genset yaitu pada variasi dengan laju aliran 3 L/min pada posisi katup ditutup rapat.  Saat katup ditutup rapat sebenarnya masih terdapat celah lobang udara pada choke dengan diameter 6 mm standart bawaan karburator. Udara yang dihasilkan dari lubang ini ternyata cukup efektif  saat dicampur LPG dengan laju aliran gas 3 L/min. Dengan demikian dapat disimpulkan bahwa genset LPG mudah dinyalakan jika campuran LPG dan udara tepat. 
Co-Authors Adhadi Kurniawan Agus Nuramal Agus Suandi, Agus Angky Puspawan Anizar Indriani Aritonang, Jefri Fanto Bismantolo, Putra Budiman, Arif Adtyas Erwinsyah, Mochamad Dava Erwinsyah Helmizar Hendra Hendra Hendri van Hoten Hutapea, Gumarang ISMAEL , ALIF RAHMAN PELDIANSYAH Johan Johan Nopriani, Meti Eliza Nurbaiti Nurbaiti Nurul Iman Supardi Pratama, Samuel Yoga Putra, Shandy Tri ricky, 240103 Rosa, Khairul Amri Rosa, M. Khairul Amri Solly Aryza Syabanda, Yukhi Mustaqim Kusuma Triyansah, Olga Zuliantoni, Zuliantoni