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All Journal Rotasi Semesta Teknika KAREBA : Jurnal Ilmu Komunikasi JMPM (Jurnal Material dan Proses Manufaktur) Turbo : Jurnal Program Studi Teknik Mesin Chemistry Indonesian Journal of Chemical Research Iqtishoduna: Jurnal Ekonomi Islam Humantech : Jurnal Ilmiah Multidisiplin Indonesia Eksergi: Jurnal Teknik Energi Jurnal Polimesin
Muhammad Nadjib, Muhammad
Universitas Muhammadiyah Yogyakarta
Religion Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Public Health

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Design and Analysis of Venturi Microbubble Generator Using Computational Fluid Dynamics Thoharudin, Thoharudin; Sunardi, Sunardi; Yudha, Fitroh Anugrah Kusuma; Nadjib, Muhammad; Nugroho, Arif Setyo
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4305

Abstract

The necessity for dissolved oxygen in water is crucial for the survival and growth of aquatic organisms, particularly tilapia. Seventy-five percent of tilapia will die if there is insufficient dissolved oxygen in the water. This work seeks to develop a venturi bubble-generating technique to combat the scarcity of dissolved oxygen in the water. A floating pump with a capacity of 12 m3/hour was selected as the medium for distributing water and generating vacuum pressure to draw in air for mixing with the water flow in the venturi. Ansys Fluent was used to model piping and venturi systems. The piping system was modeled with a single-phase (water) flow at a steady state, whereas the flow in the venturi was modeled with a multiphase (air and water) flow under transient situations. The simulation findings revealed that the pressure drop at the 90-degree elbow was much greater (27.17 kPa) than that at the 45-degree elbow (16.53 kPa). A 1-inch input diameter venturi produced bubbles with an average diameter of 105 µm, whereas a ½  inch venturi bubble generator produced bubbles with an average diameter of 83 µm. Owing to the numerous advantages of adopting a six-outlet piping system with a ½ inch venturi, this design is recommended for floating pumps with a capacity of 12 m3/h.
Physical property analysis of biodiesel from nyamplung and used cooking oil: density, viscosity, calorific value, and flash point Wahyudi, Wahyudi; Nadjib, Muhammad; Faizi, Achmad
Jurnal Polimesin Vol 22, No 2 (2024): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i2.4565

Abstract

The increasing dem and for energy and the depletion of fossil fuel shas led to the exploration of alternative fuels like biodiesel, which require sref inement tomatch diesel oil properties. This study investigates the combination of nyamplung oil, a non-edible potential source, with waste cooking oil for biodiesel production, aiming to improve its physical properties. Through a method ological approachin volving degumming, esterification, and transesterification, biodiesel was produce dfrom these oils in 11 different blend compositions. The physical properties of these blends, including density, viscosity, flashpoint, and calorific value, were rigorously tested. Results indicate that incorporating waste cooking oil into nyamplung biodiesel significantly reduces viscosity, density, and flashpoint while increasing the calorific value. Specifically, the addition of waste cooking oil altered the density from 912.74 kg/m³ in pure nyamplung biodiesel to 857.27 kg/m³, decreased the viscosity from 28.02 cStto 4.58 cSt, reduced the flash point from 223°C to 197°C, and increased the heating value from 7,626.59 cal/g to 8,348.94 cal/g.
Effect of Density and Viscosity on Injection Characteristic of Jatropha - waste Cooking Oil Biodiesel Mixture. Mariono, Mariono; Wahyudi, Wahyudi; Nadjib, Muhammad
JMPM (Jurnal Material dan Proses Manufaktur) Vol. 7 No. 1 (2023): June
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v7i1.17896

Abstract

Biodiesel has an important role in the world of transportation and its existence is taken into account. So the availability of biodiesel fuel in the future will be difficult to eliminate and must continue to be fulfilled. Therefore, it is necessary to innovate to increase the availability of biodiesel fuel. Biodiesel can be made from biological materials and includes renewable energy as a substitute for diesel oil. The production of biodiesel in this study jatropha and waste cooking oil as raw materials. This study aims to determine the effect of density and viscosity on the injection characteristics of jatropha-waste cooking oil biodiesel mixtures (1:4 and 4:1) on various B5-B40 fuels. Production of biodiesel from jatropha and waste cooking oil through degumming, esterification and transesterification processes. The results showed that the jatropha-waste cooking oil biodiesel mixed with 1:4 level B15 and 4:1 mixed with B10 level complied with SNI 7182-2015 biodiesel standards. The higher the density and viscosity values of jatropha-waste cooking oil biodiesel, the narrower the spray angle and the longer the spray penetration
Effect of Temperature on Co-Pyrolysis of Palm Kernel Shell and Plastic Waste under Natural Catalysts Thoharudin, Thoharudin; Nadjib, Muhammad; Ayatullah, Maulana Wahyu
JMPM (Jurnal Material dan Proses Manufaktur) Vol. 8 No. 2 (2024): December
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v8i2.22053

Abstract

Pyrolysis is a potential process for converting solid waste, such as biomass and plastic waste, into useful fuels and chemicals in liquid, solid, and gas forms. The pyrolysis temperature is a critical factor that influences the amount and quality of the product. Furthermore, the use of natural catalysts such as calcium oxide and natural zeolite affects the pyrolysis products. Thus, the purpose of this study is to evaluate the influence of temperature on the amount and quality of pyrolysis products, especially pyrolysis oil, using calcium oxide and natural zeolite catalysts. Pyrolysis was carried out in a stainless steel fixed-bed reactor. The temperature was kept at 400, 450, and 500 oC. The pyrolysis vapor was cooled with a water-jacket condenser, and the oil and wax were collected in an oil chamber. This study found that the pyrolysis temperatures had a substantial impact on the pyrolysis product yields by reducing the char product from 31.25% to 13.9% when the temperature rose in tandem with the fluctuations of other products (wax, liquid, and non-condensable gas). At 450 oC, the liquid product acquired its maximum density, viscosity, heating value, and acidity, which were 906.7 kg/m3, 2.2 cSt, 37.83 MJ/kg, and pH 6.2, respectively. Furthermore, increased temperature promoted the formation of aliphatic hydrocarbons.
Experimental Study of Photovoltaic System Conversion into Thermal Energy Using 50 Wp Solar Module Nadjib, Muhammad; Wahyudi, Wahyudi; Thoharudin, Thoharudin
JMPM (Jurnal Material dan Proses Manufaktur) Vol. 9 No. 2 (2025): December
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v9i2.29684

Abstract

The battery is the most vital component in a photovoltaic system. Under high solar irradiation, the battery may experience overcharging, primarily if the voltage limiter in the battery charge controller is not functioning correctly. To prevent excessive voltage buildup, the electrical energy is redirected for use in a water heating system. This study aims to experimentally examine the conversion of electrical energy from solar modules into thermal energy for heating water. The experiment was conducted outdoors using a photovoltaic setup comprising a 50 Wp solar module, a 10 A battery charge controller, and a 70 Ah battery. The water heating system includes a 25-liter water tank, a DC pump, an electric heater, a flowmeter, and piping components. Data were collected on solar module current and voltage, solar irradiation, and water temperature. The analysis shows that electrical power, thermal energy, and water temperature increase with higher solar irradiation. Throughout the experiment, the battery remained protected from overcharging. This energy conversion system successfully produced hot water at a maximum temperature of 37.68°C under an average solar irradiation of 586.31 W/m².
Co-Authors A.A. Ketut Agung Cahyawan W Aji, Yogi Purnomo Andi Alimuddin Unde, Andi Alimuddin Andi Batari Alimuddin, Andi Batari Andi Muhammad Rajanuddin, Andi Muhammad Andi Rivai Beta, Andi Rivai Anggara, Fajar Apriyanto, Apriyanto Arif Setyo Nugroho Asfah Rahman, Asfah Ayatullah, Maulana Wahyu Bambang Riyanta, Bambang Caroko, Novi Darmawan, Hanifan Decy Wahyuni, Decy Djabir Hamzah, Djabir Eka Mardariyanti, Eka Erna Areks, Erna Faizi, Achmad Hafied Cangara, Hafied Hidayat, Yaafi Ihsan Ihsan Kenny Monica Kemal Putri, Kenny Monica Kemal Kusuma Yudha, Fitroh Anugrah Majduddin, Muhammad Mariono, Mariono Maya Sari Muhammad Farid Mustati Mustati, Mustati Nevi Danila Nolvy Ruata, Nolvy Nur Asnawi Pambudi, M. Anugrah Rizky Pathur Razi Ansyah Prayogo, Nanda Rahmad Arsyad, Rahmad Ratna Ediati Santosa, Tito Hadji Agung Suhanan Suhanan, Suhanan Sunardi Sunardi Susetyorini, Jurit Tri Suyono, Warsito Kabul Thoharudin, Thoharudin Wahyudi Wahyudi Yati BT Samsuddin Yudha, Fitroh Anugrah Kusuma