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All Journal Journal of Energy, Mechanical, Material and Manufacturing Engineering Infotekmesin Madaniya Logic : Jurnal Rancang Bangun Dan Teknologi
Fitri Wahyuni
Universitas Pembanguan Nasional Veteran Jakarta
Religion Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mechanical Engineering

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Effects of leading-edge defects of the NACA 0015 airfoil on aerodynamic performance with various Reynolds number Ulfa Hanifah Nurhaliza; James Julian; Fitri Wahyuni; Waridho Iskandar
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 2 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v8i2.29400

Abstract

This study investigates and identifies the effects produced by defect on an airfoil when compared to a smooth airfoil. The defect used in this research is of the surface concaved defect (SDD) type, with a deep defect characterized by a smooth sunken deformation. The opening size used is t*=12%, and the equivalent depth of the defect is h*=3%. Computational methods are being used in this research to analyzing flow of the fluid through the NACA 0015 airfoil, both in smooth and defective airfoil, with various Reynolds Number which are 1.6×106, 2×106, and 2.5×106. Standard k-epsilon model is being used in this research as turbulence model. For the smooth airfoil, stall conditions occur at an AoA of 11º, while for the defective airfoil, they occur at an AoA of 9^° for each Re variation. The average decrease in the Cl/Cd ratio from smooth airfoil to defective airfoil at each AoA for all Re variations is 33%. There is an increase in pressure on the upperside leading edge of defective airfoil for all Re values. Based on the velocity streamlines, vortices can be found at the defect cavity, and the vortex at the defective airfoil seems larger than the smooth airfoil.
Comparative analysis of solar panel output power with variations of Heatsink type cooling systems Dwi Yulia Handayani; James Julian; Fitri Wahyuni; Ridwan Daris Naufal
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 2 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v8i2.30152

Abstract

The heatsink is installed on the back sheet of the solar panel in the form of a fin so that the air under the solar module helps the heatsink perform cooling. Temperature testing uses a thermocouple temperature sensor at several calibrated points, taking volt and current data using a multimeter. The results of this test obtained a deviation comparison value between solar panels without a heat sink and using a heat sink of ±1%. So, the similarity of deviation values from the research is used as a control variable. From all the data that has been taken, using heat sinks on solar panels can reduce excess heat in the solar panel modules. The heat transfer that occurs in this experiment is by conduction and convection. The heatsink's good performance in releasing heat with high power output can be seen at 12.25 because the resulting thermal efficiency is related to the power released at the same time. The thermal efficiency value is 20.88%, and the power increase is 19.31%.
The Influence of Fillet Step on Backward-Facing Step Flow Characteristics James Julian; Rizki Aldi Anggara; Fitri Wahyuni
Infotekmesin Vol 14 No 2 (2023): Infotekmesin: Juli, 2023
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v14i2.1919

Abstract

Backward-facing step (BFS) is a model that provides several applicative features in engineering. The complex phenomena of BFS flow have a crucial impact on any application. Therefore, this study comprehensively investigates the flow characteristics of BFS with various step shapes. The backward-facing step (F-BFS) fillets were tested at intervals of Reynolds number 50 smaller than Re smaller than 400 using the CFD approach. Based on the computational results, it was found that flow separation is a fundamental phenomenon in BFS flow. Due to sudden expansion, Flow separation forms a recirculation area which continues to increase almost linearly with an increase in the Reynolds number. The recirculation area contains unstable rotating vortexes, which can impact the flow efficiency of BFS. Using a different step shape proves that F-BFS can minimize the recirculation area to increase the efficiency of the BFS flow.
Pemanfaatan Minyak Jelantah Sebagai Program Pengembangan Keterampilan Rumah Tangga Grand Pakis Residence James Julian; Fitri Wahyuni; Putty Fauthyda Zahra Hapidzha
Madaniya Vol. 6 No. 1 (2025)
Publisher : Pusat Studi Bahasa dan Publikasi Ilmiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53696/27214834.991

Abstract

Minyak jelantah yaitu minyak goreng yang sudah melalui proses penggunaan hasil rumah tangga dan berubah secara signifikan dari segi fisik maupun kimia. Masyarakat cenderung tidak mengetahui dampak negatif dari pembuangan minyak jelantah selama ini dan bagaimana langkah yang tepat untuk mendaur ulang atau memanfaatkan minyak jelantah menjadi sesuatu yang tepat guna. Secara sederhana, pengolahan minyak jelantah menjadi Castile Soap adalah salah satu cara yang dapat ditingkatkan guna mengurangi limbah minyak jelantah menjadi produk sabun pembersih noda. Berdasarkan permasalahan yang ada, Grand Pakis Residence merupakan tempat yang dipilih untuk melakukan pemberdayaan terhadap ibu-ibu rumah tangga dalam mengolah limbah minyak jelantah. Dengan kegiatan sosialisasi dan praktik baik pemanfaatan limbah minyak jelantah diharapkan akan meningkatkan pengetahuan ibu-ibu rumah tangga mengenai imbas dari pembuangan limbah jelantah secara tidak tepat dan meningkatkan berbagai keterampilan dalam program pengembangan pengolahan limbah minyak jelantah sehingga dapat digunakan kembali.
Thermal Performance of a Branching-Channel Liquid Cooling System for Cylindrical Li-Ion 18650 Batteries Anggie Topan Wijaya; James Julian; Fitri Wahyuni; Riki Purba; Fathin Madhudhu; Elvi Ermadani; Adi Winarta
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 3 (2025): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i3.210-218

Abstract

Lithium-ion batteries need effective thermal management to avoid safety risks like thermal runaway. This study analyzes and optimizes a liquid cooling system. Battery Thermal Management System (BTMS) using a branching mini-channel cold plate design for eight Li-ion 18650 batteries. A Computational Fluid Dynamics model was developed to simulate performance at a 2C discharge rate with configurations of 3 (N3), 5 (N5), and 7 (N7) branches. The results, validated against experimental data, showed that all configurations kept maximum temperatures below 37°C and maintained temperature uniformity (ΔT) below 5°C. Increasing branches reduced pressure drop, with the N7 design showing the lowest ΔP of 5.16 Pa. Although it had a lower heat transfer coefficient, N7 achieved the highest J/F factor, indicating optimal thermo-hydraulic performance for liquid-cooled battery systems.
Comprehensive Analysis on the Influence of Flap Width on the Hydrodynamic Parameters of OWSC Devices Rasya Aulia Nathania Nisa; James Julian; Fitri Wahyuni; Riki Hendra Purba; Fathin Muhammad Mahdhudhu; Elvi Armadani
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 3 (2025): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i3.201-209

Abstract

The growing need for renewable energy has driven significant interest in harnessing ocean wave power, particularly through Oscillating Wave Surge Converters (OWSCs). This study focuses on examining the effect of flap width on the hydrodynamic capacity of an OWSC, as flap geometry plays a crucial role in energy capture efficiency. A numerical methodology utilizing the Boundary Element Method (BEM) was employed to assess hydrodynamic parameters across both temporal and frequency domains. Five flap width variations were tested under regular wave conditions with different periods, while mesh independence and validation against experimental data ensured accuracy. The results in the time domain revealed a direct correlation between flap width and angular deviation, velocity, torque, and power output, although wider flaps exhibited less stability due to increased inertia. Frequency domain analysis indicated that each flap width had a distinct resonant peak, with narrower flaps performing best at shorter periods and wider flaps at longer ones. Notably, moderately sized flaps (W2 and W3) achieved the highest efficiency, with Capture Width Ratios exceeding 70%, outperforming wider flaps despite their larger surface area. These findings highlight the importance of optimized flap width for efficient and reliable OWSC design.
Co-Authors Adi Winarta, Adi Anggie Topan Wijaya Dwi Yulia Handayani Elvi Armadani Elvi Ermadani Fathin Madhudhu Fathin Muhammad Mahdhudhu James Julian Putty Fauthyda Zahra Hapidzha Rasya Aulia Nathania Nisa Ridwan Daris Naufal Riki Hendra Purba Riki Purba Rizki Aldi Anggara Ulfa Hanifah Nurhaliza Waridho Iskandar