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All Journal Sinergi Jurnal Teknik Mesin Scientific Journal of Mechanical Engineering Kinematika Journal of Power, Energy, and Control
Alief Avicenna Luthfie
Universitas Mercu Buana
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Solidification Process Investigation of LiCl Salt as PCM with Temperature-Dependent Density and Viscosity by Enthalpy Porosity Simulation Model Ibrahim, Nur Syah; Luthfie, Alief Avicenna
Journal of Power, Energy, and Control Vol. 2 No. 1 (2025)
Publisher : MSD Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62777/pec.v2i1.42

Abstract

An enthalpy porosity simulation model is widely used to simulate the solidification process of a Phase Change Material (PCM) with constant density and viscosity. Consequently, numerical inaccuracy may arise in the investigation of the solidification process. Therefore, this study investigates the solidification of lithium chloride (LiCl) as a PCM, incorporating temperature-dependent density and viscosity in the enthalpy porosity model. Furthermore, the computational domain is represented by a concentric pipe, with the LiCl salt assumed to be fully filled within the annulus. The boundary conditions are adiabatic on the outer radius and constant temperature on the inner radius, representing the temperature of the Heat Transfer Fluid (HTF). The simulation results show that the solidification process with temperature-dependent density and viscosity required a total time of 2360 s to complete the solidification process. In addition, the solidification rate is decreased at the beginning of the solidification process and then increased before being decreased at the end of the solidification process. Furthermore, a comparison is conducted with constant density and viscosity. The comparison result shows that the solidification time of temperature-dependent density and viscosity is shorter than the solidification process time of constant density and viscosity with a deviation of 8.5%, indicating the importance of using the temperature-dependent density and viscosity to investigate the solidification time. Conversely, the solidification rate shows a similar tendency, indicating the insignificant effect of using the temperature-dependent density and viscosity to investigate the solidification rate.
STUDI NUMERIK KARAKTERISTIK VORTEX GENERATOR PADA MODIFIKASI AIRFOIL JOUKOWKSI DAN PADA SILINDER Re = 100,000 Fajar Anggara; Dedik Romahadi; Subekti; Alief Avicenna Luthfie
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.797

Abstract

Utilization of ocean wave energy is one of the renewable energy sources with high potential in Indonesia. The use of Vortex Induced Vibration (VIV) has been widely developed by researchers, where the vortex will self-excite to create vibrations. Of course, its efficiency will increase when installed simultaneously to form a row. Wake Induced Vortex (WIV) has greater potential because it adds vibration through a vortex generator in a row of VIVs in the wake area. This study studied the characteristics of the vortex generator that will be used in WIV. The research method used CFD simulation Fluent 2025 with 3-dimensional geometry. The mesh used is 700 thousand in the form of a hexahedral. Independent mesh studies have been conducted so that the number of meshes 700 thousand is the most optimal and does not affect the simulation results. The Y+ value used is 1, so the mesh thickness close to the wall for Re 100,000 is 1 mm. The location of the flow separation greatly affects the vortex structure and shedding frequency of each geometry. Whereas airfoil produces bigger power but it has less frequency shedding than cylinder.
Co-Authors Abdul Hamid Agung Wahyudi Biantoro Dedik Romahadi Desti Dorion, L. B. Fahmi Hidayat Fajar Anggara Ghufron, Hanif Hanif Ghufron Hasan, Muhammad Miqdad Ibrahim, Nur Syah L. B. Desti Dorion Murtyas, Solli Dwi Parwitasari, Fadella Binda Raynaldi, Ray Sayekti, Mega Esti Suci Setyoko, Premadi Solli Dwi Murtyas Subekti Yosua Heru Irawan