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Purnami
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Mechanical Engineering

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THE EFFECT OF AIR FLOW RATE ON THE CHARACTERISTICS OF PULVERIZED CATALYTIC COMBUSTION OF RICE HUSK WASTE BIOMASS Hamidi, Nurkholis; Yuliati, Lilis; Purnami; Maulana , Syahrizal
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.v16i2.1856

Abstract

The purpose of this study was to determine the effect of airflow rate on the characteristics of catalytic combustion of pulverized rice husk biomass. Natural zeolite was used as the catalyst in this study. The combustion characteristics included the value of Initiation Temperature of Volatile Matter (ITVM), Initiation Temperature of Fixed Carbon (ITFC), peak of weight loss rate temperature (PT), Burning out Temperature (BT), mass reduction graph (TGA), mass reduction rate (DTG), heating value, and activation energy were measured. The sample used was 45-200 µm in size, and the percentage of catalyst was 7%. The research was carried out using 4 variations, including 2.9 ml/min, 5.8 ml/min, 9.0 ml/min, and 14.8 ml/min, each of which contains the same air composition, namely 80% nitrogen and 20% oxygen. The results showed that the greater the airflow contained in the pulverized biomass catalytic combustion process could increase the combustion characteristics including reducing the value of ITFC, PT, and BT. In addition, it also accelerates the rate of mass reduction and decreases its activation energy due to increasing pressure along with increasing temperature in the combustion chamber, besides that excess air also causes the combustion that occurs in more perfect combustion.
THERMODYNAMIC ANALYSIS OF ALKALINE ELECTROLYSIS UNDER VISIBLE LIGHT ILLUMINATION: COMPARATIVE ASSESSMENT OF GREEN AND BLUE LED EXPOSURE Santoso, Mardi; Ahmad, Anton Royanto; Sinurat, David Fernando; Hamidi, Nurkholis; Purnami
Jurnal Rekayasa Mesin Vol. 16 No. 3 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

This study explores the thermodynamic behavior of alkaline electrolysis under visible light illumination, focusing on the effects of green and blue wavelengths in the absence of chemical additives. Through a series of controlled experiments, temperature evolution, energy input, and thermal efficiency were analyzed over a 20-minute electrolysis period. Results show that both green and blue light enhance the system's thermal response compared to dark (control) conditions, with blue light achieving the highest temperature rise and energy conversion efficiency. Arrhenius analysis revealed a clear temperature dependence of the rate constant, and strong correlations were observed between temperature rise (ΔT), heat energy (Q), and system efficiency. These findings suggest that visible light particularly blue light can significantly improve the thermal dynamics of electrolysis systems, paving the way for low-cost, passive solar-assisted hydrogen production.
Co-Authors Anton Royanto Ahmad Lilis Yuliati Mardi Santoso Maulana , Syahrizal Nurkholis Hamidi Sinurat, David Fernando