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All Journal Rekayasa Mesin Jurnal Rekayasa Mesin Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin
Kharisma, Sunandi
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Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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ANALISA DISTRIBUSI TEMPERATUR INTERMEDIATE TANK FASSIP-07 MENGGUNAKAN METODE COMPUTATIONALFLUID DYNAMICS (CFD) Prasetio, Dimas; Zuliantoni; Juarsa, Mulya; Ismarwanti, Sri; Kharisma, Sunandi
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 9 No. 1 (2025): April 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v9i1.39825

Abstract

This study aims to understand the temperature distribution in the natural circulation system in the Intermediate Tank FASSIP-07 using the Computational Fluid Dynamics (CFD) method. Simulations were performed using Ansys Workbench R1 2024 software, with inlet temperature variations of 70°C, 80°C, and 90°C. The results showed that the highest temperature distribution was found at the inlet with a temperature of 90°C, while the outlet reached the lowest temperature at 70°C. This conclusion was obtained from the analysis of fluid flow driven by the buoyancy phenomenon due to differences in density. This study shows the potential for using a passive cooling system for nuclear reactors to improve safety in emergency conditions.
CHARACTERIZATION OF SPECIFIC HEAT CAPACITY OF WATER-ALUMINUM OXIDE-BASED NANOFLUIDS Waluyo, Roy; Deendarlianto, Deendarlianto; Indarto, Indarto; Yuliaji, Dwi; Kharisma, Sunandi; Maryadi , Shendy Akbar; Oktaviandi, Ryan; Juarsa, Mulya
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.2003

Abstract

Since the advent of nanofluids, engineers have expected major gains in thermal‐system efficiency. Yet a key property—specific heat capacity (Cp)—remains poorly understood, because Cp is not a single value but a spectrum governed by nanoparticle size, shape, material, and concentration. Deeper insight is essential, especially for natural‑circulation experiments that rely on accurately characterized working fluids. This study targets that gap by measuring the Cp of Al₂O₃–water nanofluids at mass fractions of 0.1, 0.2, and 0.3 wt%. Thirty-nanometer Al₂O₃ particles were dispersed in deionized water using magnetic stirring and ultrasonic processing. The nanofluid was heated in a thermostatic bath while temperature rise was tracked with thermocouples and a data‑acquisition system. Results reveal that relative Cp decreases as nanoparticle concentration increases and is also sensitive to fluid temperature. These findings clarify how concentration and temperature jointly shape the thermal behavior of Al₂O₃ nanofluids, guiding for design high‑performance natural‑circulation loops and other heat‑transfer applications.
Analisis Aliran Sirkulasi Alami di Bagian Pendingin Berdasarkan Variasi Temperatur Air Pemanas pada Untai Rektangular TP FASSIP-04 Ver.2 Wahyuni, Asri; Yuliaji, Dwi; Setiawan, Putut Hery; Budiyanto, Nur Rochman; Maryadi, Shendy Akbar; Pamungkas, Adhika Enggar; Budiman, Arif Adtyas; Kharisma, Sunandi; Waluyo, Roy; Juarsa, Mulya
Jurnal Rekayasa Mesin Vol. 19 No. 1 (2024): Volume 19, Nomor 1, April 2024
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v19i1.4706

Abstract

Sistem pendingin pasif berbasis mekanisme sirkulasi alami menjadi topik hangat dalam sistem keselamatan PLTN karena tidak membutuhkan pasokan listrik dan juga lebih ekonomis, maka perlu dilakukan penelitian untuk memperoleh karakteristik pendinginan pada bagian tangki pendingin perlu dipelajari mengingat proses pendinginan dilakukan dengan model tidak langsung. Tujuan penelitian yang dilakukan adalah untuk menganalisis aliran sirkulasi alami di bagian pendingin berdasarkan variasi temperatur air pemanas pada Untai Rektangular TP FASSIP-04 Ver.2. Penelitian dilakukan untuk memperoleh karakteristik perubahan temperatur pada bagian tangki pendingin berdasarkan variasi temperatur air pemanas serta bilangan Reynold dan laju aliran yang terjadi terhadap variasi temperatur. Metode penelitian dilakuan secara eksperimental dengan memvariasi temperatur air pemanas dari 50oC, 60oC, dan 70oC dengan daya pemanas 4,2 kW dan temperatur air pendingin ditetapkan pada 20oC. Pengolahan data menghasilkan grafik karakteristik temperatur dan laju aliran yang terjadi. Hasil eksperimen menunjukkan bahwa berdasarkan laju aliran sirkulasi alami yang terjadi pada bagian tangki pendingin Untai Rektangular TP FASSIP-04 Ver.2 untuk variasi temperatur air pemanas 50 oC sebesar 1,32 LPM berada pada rejim aliran laminar dengan bilangan Reynold bernilai 1851 sedangkan pada temperatur air pemanas 60 oC dan 70 oC sebesar 1,61 LPM dan 1,94 LPM berada pada rejim aliran transisi yang secara berturut-turut bilangan Reynold bernilai 2624 dan 3716. Kenaikan gradien temperatur antara sisi panas dan sisi dingin telah meningkatkan laju aliran sirkulasi alami dan mempengaruhi rejim aliran yang terbentuk.
Co-Authors Budiman, Arif Adtyas Budiyanto, Nur Rochman Deendarlianto Dwi Yuliaji Indarto Indarto Maryadi , Shendy Akbar Maryadi, Shendy Akbar Mulya Juarsa Oktaviandi, Ryan PAMUNGKAS, ADHIKA ENGGAR Prasetio, Dimas Putut Hery Setiawan Roy Waluyo Sri Ismarwanti, Sri Wahyuni, Asri Zuliantoni, Zuliantoni