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Journal of Energy, Mechanical, Material and Manufacturing Engineering
Published by Universitas Muhammadiyah Malang
ISSN : 25416332     EISSN : 25484281     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Journal of Energy, Mechanical, Material and Manufacturing Engineering Scientific (JEMMME) is a scientific journal in the area of renewable energy, mechanical engineering, advanced material, dan manufacturing engineering. We are committing to invite academicians and scientiests for sharing ideas, knowledges, and experiences in our online publishing for free of charge. It would be our pleasure to accept your manuscripts submission to our journal site.
Arjuna Subject : -
Articles 7 Documents
 1 
Search results for , issue "vol. 10 no. 2 (2025)" : 7 Documents clear
Optimization of torrefaction temperature on the physical and chemical properties of ironwood (Eusideroxylon zwageri) as an alternative biofuel Ichwan Noor Ardiyat; Noor Rahman; Jarot Wijayanto; A'yan Sabitah; Ahmad Robittah
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.42340

Abstract

This study aims to investigate the effect of torrefaction temperature on the physical and chemical properties of ironwood (Eusideroxylon zwageri) and to evaluate its potential as an alternative biofuel. Torrefaction was carried out at 200°C, 250°C, and 300°C for 150 minutes under oxygen-limited conditions, and the resulting char, tar, and gas yields were quantified, while chemical changes were analyzed using Fourier Transform Infrared Spectroscopy (FTIR). The results indicate that increasing temperature significantly affects product distribution, with the highest char yield (52%) obtained at 250°C and increased gas formation at 300°C. FTIR analysis revealed a progressive reduction of hydroxyl (O–H) and carbonyl (C=O) functional groups, indicating enhanced deoxygenation and carbonization at higher temperatures. These chemical transformations suggest improved thermal stability and fuel quality of the torrefied ironwood. It can be concluded that Eusideroxylon zwageri has strong potential as a renewable biofuel feedstock, with torrefaction at 250°C being the most suitable condition for solid biofuel production.
Comparison analysis of engine performance fueled with B30 Nyamplung biodiesel and Pertadex Moh. Syaiful Anwar; Nurhaji Suprapto Wijono; Dimas Agung Trisliatanto
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.43223

Abstract

Energy conservation has not received sufficient consideration in national energy management. Increasing the country's energy supply. Meanwhile, improving public access has been the main objective of energy management in recent years. Increased use of fossil fuels and the provision of electricity in rural regions have made this possible. This study aimed to determine how the mixture of ethanol, Nyamplung, and diesel oil (B0, B30, B30E10, and Pertadex) affected the physical and chemical properties and performance of a single-cylinder diesel engine. In this study, an experimental method was employed to evaluate the effect of mixing Nyamplung biodiesel with ethanol and to determine the biodiesel composition. The study found that the viscosity and density of liquid fuels affected engine performance. Diesel engines experience incomplete combustion because fuel viscosity decreases with increasing engine temperature. Higher mechanical power had correlated with lower effective power because longer rotations cause greater friction. B30 fuel exhibited higher Specific Fuel Consumption (SFC) after the addition of ethanol. High or low thermal value efficiency was the level of heat contained in the fuel. The addition of 10% ethanol to B30E10 as a fuel mixture is able to produce lower carbon dioxide emissions.
Computational fluid dynamics software based on the artificial compressibility method Yosua Heru Irawan; Daru Sugati; Kristian Hubra Kadu; Syed Ahmad Raza
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.42462

Abstract

This study aims to develop a computational fluid dynamics (CFD) software package based on the Artificial Compressibility Method (ACM) for solving incompressible fluid flow problems. CFD is a vital engineering tool that enables numerical simulation of fluid motion. The ACM, introduced to enhance computational efficiency, allows incompressible flows to be simulated similarly to compressible flows, resulting in faster and more stable numerical convergence.  The Finite Volume Method (FVM) was employed to discretize the Navier–Stokes and continuity equations, incorporating an artificial compressibility term. The developed software was validated using two benchmark cases: lid-driven cavity flow and channel flow. In the lid-driven cavity flow test, simulations were conducted at Reynolds numbers (Re) of 100 and 3200, showing excellent agreement with benchmark data from Ghia et al. (1982). For the channel flow case, numerical results were compared with the analytical Hagen–Poiseuille solution for fully developed laminar flow, demonstrating strong consistency. The results indicate that the software accurately reproduces velocity profiles in both laminar and fully developed regimes, while also improving computational speed without compromising accuracy. This development broadens access to CFD technology for a wide range of engineering applications, enabling complex flow analyses with more efficient use of computational resources.
Solar-powered feed chopper for aquaculture: Toward farmer feed independence Qory Hidayati; Aryati Muhaymin Marali; Danar Retno Sari; Yasmin Zulfati Yusrina; Hendra Sanjaya Kusno; Steven Daniel Kussoy; Candra Irawan
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.42537

Abstract

The dependence on manufacturer feed causes high costs in farm production and, therefore, makes it susceptible to price fluctuations in the feed. This study aims to design, develop, and evaluate a solar-powered fish feed chopper suitable for off-grid aquaculture applications. The method of this study uses an engineering-based approach. It involves mechanical system design, analytical energy requirement calculations, battery sizing with depth-of-discharge considerations, and prototype fabrication. Experimental testing was conducted under solar-assisted and battery-only operating conditions using a 0.5-phase induction motor (370 W). Results showed that a six-hour no-load operation required 2,220 Wh of energy. Considering inverter losses and VRLA battery limitations, the effective safe operating time was limited to approximately three hours without solar input. A PV configuration consisting of three 200 Wp panels with an MPPT charge controller was sufficient to maintain stable daytime operation and sustain battery state-of-charge between 90–100%. The findings demonstrate that the proposed off-grid PV system can reliably support fish feed chopping operations, although system performance is constrained by battery depth-of-discharge and solar irradiance. This study confirms the feasibility of solar-powered feed choppers as a sustainable solution for small-scale aquaculture.
Effect of tube shape variations on the mechanical performance of a runflat installation and removal tool using finite element analysis Dhio Marchel Pratama Putra; Iis Siti Aisyah; Muhammad Hasbi Rusmana; Daryono
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The increasing demand for operational efficiency in military vehicle maintenance has highlighted the need for effective tools for the installation and removal of runflat systems in armored vehicles. This study investigates the influence of tube cross-sectional geometry on the mechanical performance of a runflat installation and removal tool through finite element analysis (FEA) using ANSYS Workbench 2021 R2. Three tube geometries—hexagonal, octagonal, and circular—were modeled using SS400 structural steel as the material. Two loading scenarios were analyzed: bead loosening and runflat pressing. The evaluated parameters included Von Mises stress, total strain, total displacement, and safety factor. Simulation results indicate that the octagonal tube geometry demonstrated the best overall performance in the bead loosening scenario, with the lowest Von Mises stress (86.078 MPa), minimal strain (0.0001888 mm/mm), moderate displacement (0.62883 mm), and the highest safety factor (2.672). The circular tube geometry achieved the lowest displacement (0.59168 mm) but exhibited higher stress levels. In the runflat pressing scenario, all geometries operated within safe limits, with stress levels ranging from 11–14 MPa and safety factors reaching the maximum value of 15. These findings suggest that an octagonal tube geometry offers an optimal balance between strength, deformation control, and safety, making it suitable for field applications without revealing sensitive manufacturing details.
Interfacial dynamics and thermal behaviour of a 5%v/v butanol/water droplet impacting a hot surface Arif Widyatama; Tito Shantika; Indarto; Deendarlianto
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.43484

Abstract

Efficient cooling at high surface temperatures remains challenging because droplet surface interactions and the associated heat transfer mechanisms are not yet fully understood. The present experimental study aims to investigate the impact dynamics and transient heat transfer characteristics of a single binary droplet impinging on a heated surface under different wall temperature conditions. A butanol/water droplet was deposited onto an Inconel 718 under a horizontal configuration. High-speed visualisation was used to capture droplet behaviour, while the wall temperature was measured at the centre of the specimen to evaluate the cooling performance. Experiments were conducted for initial wall temperatures ranging from 85 °C to 195 °C. The results show that droplet spreading and recoiling dominate the cooling process at low wall temperatures, leading to limited heat transfer enhancement. At higher wall temperatures, pronounced interfacial disturbances and internal droplet motion occur, resulting in a marked increase in heat transfer. Despite the intensified vapour activity, the droplet maintains surface wetting, allowing sustained heat transfer without dry-out. The findings demonstrate the importance of interfacial dynamics in droplet-based cooling at high wall temperatures.
Photovoltaic performance analysis using Computational Fluid Dynamics (CFD) simulation methods A. Syahrinaldy Syahruddin; Radhiansyah; Marfiansyah Nasra Dwiprayuda
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.42915

Abstract

Photovoltaic technology is increasingly in demand by the wider community. Situated in the tropics, Indonesia benefits from abundant sunlight, positioning it favourably for the adoption of this technology. Studies on photovoltaics have been conducted in potential areas, including Parepare, South Sulawesi. As one of the South Sulawesi regions with strong agricultural and industrial potential, it is currently pursuing sustainable renewable energy development, encompassing photovoltaic technology. This study aims to examine the performance of solar photovoltaic systems through Computational Fluid Dynamics (CFD) simulations. The solar photovoltaic system is modelled and simulated using fluid-flow simulation software. ANSYS Fluent Student is applied with a constant solar radiation of 800 V/m2 for an hour. Experimental test data serve as a reference for simulation in this study. The results indicate that the maximum temperature ranged from 47.7 °C to 50 °C, represented by an orange-to-red colour gradient in the temperature contour, while the minimum temperature ranged from 26.9 °C to 31 °C, represented by a dark-to-light blue gradient. This suggests that the one-hour heating process under constant solar radiation, as simulated by this method, operates effectively and more accurately reflects real-world conditions.

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