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All Journal Rotasi Rekayasa Mesin Journal Industrial Servicess Jurnal Manajemen, Ekonomi, Hukum, Kewirausahaan, Kesehatan, Pendidikan dan Informatika (MANEKIN)
Wahyudi, Hadi
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Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Mechanical Engineering Transportation

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Analisis Computational Fluid Dynamics (CFD) Winglet Pesawat Hercules C-130J TNI AU Ibrahim, Muhammad; Fauzi, Ahmad Hasan; Wahyudi, Hadi
ROTASI Vol 26, No 2 (2024): VOLUME 26, NOMOR 2, APRIL 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.2.38-44

Abstract

Winglet adalah ekstensi vertikal atau miring pada ujung sayap yang berfungsi untuk mengurangi gaya hambat induced drag dan meningkatkan performa aerodinamika sayap. Penelitian ini bertujuan untuk menguji pengaruh penambahan winglet pada sayap pesawat Hercules C-130J. Variasi yang dianalisis meliputi jenis winglet (canted dan blended) dan sudut cant (30°, 60°, dan 90°) terhadap lift performance sayap seperti koefisien angkat (CL) dan koefisien hambat (CD­). Analisis dilakukan menggunakan metode simulasi computational fluid dynamics (CFD) dengan perangkat lunak Ansys Fluent 2022 R1. Hasil menunjukkan bahwa winglet jenis blended pada sudut cant 30° merupakan yang terbaik, dengan meningkatkan rasio lift terhadap drag (CL/CD) sebesar 3.3% dan mengurangi pembentukan trailing vortices di ujung sayap.
EXPERIMENTAL STUDY OF COOLING FLUID VARIATION ON THE THERMOELECTRIC HOT SIDE ON THERMOELECTRIC VACCINE COOLER BOX PERFORMANCE Pratama, Novreza; Rosyadi, Imron; Wahyudi, Hadi; Fasya, M. Haykal
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1850

Abstract

The advanced countries make health a high priority and collaborate to create a better quality of life. Vaccination is a critical component of global health. Vaccines must be stored at a constant temperature of 2-8℃, to maintain the viability of the vaccine cold chain. Thermoelectric cooling systems (TECs) are a solution that is simple, lightweight, low cost, and portable. Excessively high hot-side temperatures can be detrimental to operators and the environment during distribution processes. The application of fans and circulating fluid can reduce the TEC hot-side temperature. The lowest TEC temperature difference of 30.26℃ is achieved by using only a fan. The minimum hot side of 31.28℃ is achieved with the fan and circulating water model. The minimum cold side can be increased to 0.53℃ with the fan and circulating radiator coolant model. All tests were at vaccine-eligible temperatures. The best COP of 0.14 can be reached in this study.
Nanofluid cooling of 18650 lithium-ion batteries through wavy channel tube Kanani, Nufus; Fatwa, Muhammad Ilham; Yusuf, Yusvardi; Pinem, Mekro Permana; Wahyudi, Hadi; Satria, Dhimas; Sukamto, Dwinanto; Purwamargapratala, Yustinus
Journal Industrial Servicess Vol 10, No 2 (2024): October 2024
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jiss.v10i2.28519

Abstract

The electric vehicle (EV) industries have grown; in 2023 EV sales increased by more than 30% compared to 2022. The central issue of this industry is the battery because of the cost and environmental problems.  This makes efficient battery operation and condition imperative. The electric vehicle lithium-ion batteries are highly temperature-dependent for optimal performance and longevity. A cooling system is needed to maintain the temperature of the lithium-ion battery within the optimal temperature range. This study proposes nanofluid cooling based on Cellulose Nanocrystals (CNC) inside the wavy channel tube. Other fluid cooling, such as air and water, are compared. Three-dimensional (3D) transient simulation is performed by varying the cooling fluid and mass flow rate. On the other hand, experiments were conducted to validate the simulation's conformity to the battery module's temperature. The performance of the cooling fluid inside the wavy channel effectively keeps the battery heat dissipation and temperature uniformity. The nanofluid can maintain the temperature of the battery module at its optimal temperature (below 40°C), even with the lowest flow rate (5×10-4 kg/s).
Tantangan Hukum Humaniter Dalam Menghadapi Perang Asimetris: Analisis Dan Solusi Wahyudi, Hadi; Khakim, Khalimul; Susilo, Tarsius; Zulkifli; Tunggul Wiratama, Wahyu
Jurnal Manajemen, Ekonomi, Hukum, Kewirausahaan, Kesehatan, Pendidikan dan Informatika Vol 3 No 3 : Maret (2025): Jurnal Manajemen, Ekonomi, Hukum, Kewirausahaan, Kesehatan, Pendidikan da
Publisher : Shofanah Media Berkah

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

Abstract

Asymmetric warfare involving state and non-state actors in modern conflicts poses serious challenges to the implementation of International Humanitarian Law (IHL). This study analyzes the mismatch in the identification of combatants, the problems surrounding civilian protection, and accountability for violations within the context of asymmetric conflicts. The findings indicate that the ambiguity of combatant status and the strategic use of civilians as human shields hinder the application of fundamental IHL principles, such as distinction and proportionality. Moreover, international legal enforcement mechanisms continue to face significant limitations in prosecuting violations, particularly those committed by non-state actors. This study recommends strengthening adaptive legal frameworks and establishing effective accountability mechanisms to ensure the protection of human rights and legal order in asymmetric conflict situations. The research contributes significantly to the development of humanitarian law that is responsive to the dynamics of contemporary conflicts.
EXPERIMENTAL STUDY OF COOLING FLUID VARIATION ON THE THERMOELECTRIC HOT SIDE ON THERMOELECTRIC VACCINE COOLER BOX PERFORMANCE Pratama, Novreza; Rosyadi, Imron; Wahyudi, Hadi; Fasya, M. Haykal
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1850

Abstract

The advanced countries make health a high priority and collaborate to create a better quality of life. Vaccination is a critical component of global health. Vaccines must be stored at a constant temperature of 2-8℃, to maintain the viability of the vaccine cold chain. Thermoelectric cooling systems (TECs) are a solution that is simple, lightweight, low cost, and portable. Excessively high hot-side temperatures can be detrimental to operators and the environment during distribution processes. The application of fans and circulating fluid can reduce the TEC hot-side temperature. The lowest TEC temperature difference of 30.26℃ is achieved by using only a fan. The minimum hot side of 31.28℃ is achieved with the fan and circulating water model. The minimum cold side can be increased to 0.53℃ with the fan and circulating radiator coolant model. All tests were at vaccine-eligible temperatures. The best COP of 0.14 can be reached in this study.
Co-Authors Dhimas Satria Fasya, M. Haykal Fatwa, Muhammad Ilham Fauzi, Ahmad Hasan Imron Rosyadi Khakim, Khalimul Muhammad Ibrahim Nufus Kanani, Nufus Pinem, Mekro Permana Pratama, Novreza Sukamto, Dwinanto Susilo, Tarsius Tunggul Wiratama, Wahyu Yustinus Purwamargapratala Yusvardi Yusuf Zulkifli