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All Journal R.E.M (Rekyasa Energi Manufaktur) Jurnal SCIENCE MATH
Nicky Yongkimandalan
Universitas Pembangunan Nasional Veteran Jakarta
Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Engineering Mathematics Physics

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ANALISIS KESTABILAN MODEL PENYEBARAN FLU BURUNG TERHADAP POPULASI UNGGAS Syifaul Janan; Tuhfatul Janan; Fani Firmansyah; Didi Harlianto; Nicky Yongkimandalan
SCIENCE MATH: Jurnal Ilmu Sains dan Matematika Vol. 1 No. 2 (2025): May
Publisher : PT Innovative Academic Journals

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/1ccn7t70

Abstract

This research aims to analyze Avian Influenza spread model around the equilibrium point. The population discussed is the poultry population which consists of two sub-populations, namely susceptible and infective. The method used is literature study through reference books and scientific articles related to the models. Then, the mathematical model, equilibrium point, and model stability were calculated. The results of calculations were made into a simulation model using Matlab and Maple software. It was found that there was an Avian Influenza virus spread to the poultry population which was influenced by several factors, namely birth, natural death, death due to infection, and migration (movement).
Thermo-hydraulic Performance of Double-cut and Perforated Twisted Tape Based on Constant Surface Area Naufal Faizurrahman Siregar; Damora Rhakasywi; Nicky Yongkimandalan
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 2 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i2.1856

Abstract

Improving the heat transfer of the heat exchanger pipe needs to be done. Inserting twisted tapes is often applied because it increases the Nusselt number, but it causes excessive pressure drop. This study investigates three variations of twisted tape, namely: plain, semicircular double cut, and circular perforation. The research gap concerns reducing the surface area of the twisted tape to the same area. Simulation using ANSYS Fluent. Variation analysis shows the Nusselt number increased by 36.64% for smooth, 40.94% for double semicircular cuts, and 36.95% for circular perforations. The friction factor increased by 232.26%, 253.46%, and 239.96%, respectively. The PEC value for each variation below 1 indicates a decrease in efficiency after the addition of the twisted tape. However, this study concludes that the double cut has the highest efficiency compared to other variations for the Reynolds number range of 6000 to 17000.
Co-Authors Damora Rhakasywi Didi Harlianto Fani Firmansyah Naufal Faizurrahman Siregar Syifaul Janan Tuhfatul Janan