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INDONESIA
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 193 Documents
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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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