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All Journal Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin
Y.A. Padang
Universitas Mataram
Aerospace Engineering Automotive Engineering Mechanical Engineering Physics

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Numerical study of exhaust flow behavior in a calcium carbide waste adsorber for two-wheel vehicle applications H.S. Tira; Y.A. Padang; N. Kaliwantoro; A.D. Catur; I.G.N.K. Yudhyadi; S. Rahman
Dinamika Teknik Mesin Vol 16, No 1 (2026): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v16i1.1247

Abstract

Calcium carbide waste has demonstrated potential as an adsorber material for motorcycle exhaust emission control; however, the internal flow and thermal mechanisms governing its performance remain unclear. This study presents a computational fluid dynamics (CFD) analysis of exhaust gas flow through a calcium carbide waste adsorber to elucidate pressure, velocity, temperature, and turbulence characteristics. Simulations were conducted for adsorber lengths of 50, 100, and 150 mm, with the 150 mm configuration selected as a representative case due to similar overall trends. The results indicate a gradual pressure reduction along the exhaust system, flow acceleration within the adsorber due to cross-sectional constriction, and non-uniform temperature distribution influenced by asymmetric flow patterns. Turbulence kinetic energy increases upon gas entry into the adsorber and varies with adsorber length, highlighting the role of geometry in flow mixing and turbulence dissipation. These findings provide physical insight into the mechanisms underlying the emission reduction observed in previous experimental studies.
Effect of inlet air velocity on air-water harvester machines using one and two evaporator with 1.5 PK compressor power M.A. Vayasqi; Y.A. Padang; M. Mirmanto
Dinamika Teknik Mesin Vol 15, No 2 (2025): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v15i2.1077

Abstract

During the dry season, clean water crisis often occurs in various parts of Indonesia. As a result, clean potable water is difficult to obtain. Therefore, this research uses an air-water harvester machine, because this machine can be used anywhere as long as there is a source of electricity at that location. This study aims to determine the effect of inlet air velocity on air-water harvester machines using one and two evaporators with 1.5 PK rotary compressor power on water mass and total heat transfer rate. The method used in this research is the experimental method, with variations in inlet air velocity of 0 m/s, 1.5 m/s and 3 m/s, using one and two split AC fin type evaporators each with a capacity of 0.5 PK, with a pipe diameter of 7.65 mm. The refrigerant used is R32. The study was conducted from 09:00 to 16:00, for 18 days, 7 hours per day. The results showed that the higher the air velocity used and the increase in the number of evaporators, can increase the mass of water and the heat transfer rate obtained. The highest mass of water and heat transfer rate obtained in this study is in the air velocity variation of 3 m/s using two evaporators, which is 4.073 kg of water mass for 7 hours and a total heat transfer rate of 1375.09 W.
Co-Authors A.D. Catur H.S. Tira I.G.N.K. Yudhyadi M. Mirmanto, M. M.A. Vayasqi N. Kaliwantoro S. Rahman