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Majalah Teknik Mesin
Published by Universitas Muhammadiyah Surakarta
ISSN : 14114348     EISSN : 25414577     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology
Media Mesin: Majalah Teknik Mesin is published by Mechanical Engineering Department, Faculty of Engineering, Universitas Muhammadiyah Surakarta, Indonesia. Media Mesin: Majalah Teknik Mesin is an open-access peer-reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. Media Mesin: Majalah Teknik Mesin accepts submissions from all over the world, especially from Indonesia. Media Mesin: Majalah Teknik Mesin aims to provide a forum for national and international academicians, researchers, and practitioners on mechanical engineering to publish the original articles. All accepted articles will be published and will be freely available to all readers with worldwide visibility and coverage. The scope of Media Mesin: Majalah Teknik Mesin is specific topics issues in mechanical engineering such as: Energy Conversion and Management Thermofluids Material and Manufacturing, and Design and Structure All articles submitted to this journal can be written in Bahasa Indonesia and English. The journals will be published two times a year namely in January and July.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 5 Documents
 1 
Search results for , issue "Vol. 26 No. 1 (2025)" : 5 Documents clear
EVALUATION OF ECONOMIZER HEAT TRANSFER IN BOILER RECOVERY UNITS IN PULP FACTORY Panjaitan, Jabosar Ronggur Hamonangan; Manurung, Anggun Theresia; Galingging, Vanisa Helena; Purba, Sasro Arif
Media Mesin: Majalah Teknik Mesin Vol. 26 No. 1 (2025)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v26i1.3494

Abstract

A boiler generates steam by principally exchanging heat. The economizer helps heat the feed water as part of a boiler system. Economizer and boiler functions predictably can improve heat transfer efficiency. Specifically, this study's research method for heat transfer and economizer efficiency of the boiler is in the pulp production plant unit. The heat transfer coefficient and efficiency were calculated based on water temperature and flue gas entering and exiting the economizer. Based on this research, it was found that during the second to fourth-day evaluation, the heat transfer effectiveness and heat transfer coefficient were low. The lowest economizer heat transfer effectiveness on the second day was 72%. Meanwhile, the lowest economizer heat transfer coefficient on the fourth day was 925 W/m2K. The low value of the heat transfer effectiveness and heat transfer coefficient can be caused by scaling in the economizer, so heat transfer was not optimal. The higher the value of heat transfer effectiveness in the economizer, the more flue gas heat will be extracted. Maximum heat transfer can be reached by the economizer cleaning process to remove the scaling, so heat transfer between flue gas and water occurs maximally.
FRICTION PRESSURE PREDICTION OF SUPERCRITICAL CO2 TURBULENT FLOW IN A CONCENTRIC ANNULUS Uddin, Md.; Hossan, Md. Nahid; Ahmed, Mim Mashrur; Karal, Raihan
Media Mesin: Majalah Teknik Mesin Vol. 26 No. 1 (2025)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v26i1.4865

Abstract

This study uses a numerical approach to examine the visual axial pressure gradient and friction factor characteristics of supercritical CO2 turbulent flow in a concentric annulus. The Computational Fluid Dynamics (CFD) software package (FLUENT) was applied for the investigation. The inlet temperature varied from 31 to 110 °C at two operating pressures 9 MPa and 14 MPa. The effect of mass flow rate, annulus clearance, and shaft rotational speed on the pressure gradient and friction factor are investigated. The results show that the pressure gradient is non-linear and the friction factor changes abruptly near the critical point. The effect of mass flow rate and shaft rotational speed on the friction factor is found significant whereas the effect of clearance is insignificant. The friction factor for a given condition is found in the range 0.042-0.029. A one-and-a-half times increase in the friction factor was found when there was a two-time increase in the rotational speed. A satisfactory agreement is obtained between the results predicted by CFD (fluent) when compared with the results predicted by the Darcy Weisbach equation and the Moody diagram and then with the experimental. Hence the Darcy Weisbach equation and Moody diagram can be an effective means of determining the pressure and friction factor respectively for the supercritical CO2 turbulent flow application through the concentric annulus.
Synthesizing Iron Atom Doped Carbon Nanotubes Kutelia, Elguja R; Bakhtiyarova, Ayten S; Bakhtiyarov, Sayavur I
Media Mesin: Majalah Teknik Mesin Vol. 26 No. 1 (2025)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v26i1.5241

Abstract

One of the main challenges in synthesizing polytetrafluoroethylene (PTFE)-based iron cluster-doped carbon nanotube (CNT) nanocomposites is achieving uniform doping without causing aggregation or phase separation of the iron clusters, which can adversely affect the material’s properties. Iron nanoparticles tend to agglomerate due to their strong magnetic interactions and high surface energy, resulting in inhomogeneous doping that diminishes the effectiveness of the composite in applications like electromagnetic shielding, catalysis, or energy storage. To mitigate this, controlled synthesis techniques such as Chemical Vapor Deposition (CVD) with regulated precursor flow rates or solution-based methods with surfactants can be utilized. Accurate characterization using SEM-EDX analysis is also crucial, although distinguishing iron clusters from the carbon matrix can be difficult due to similar contrast levels. Complementary techniques like transmission electron microscopy (TEM) or X-ray photoelectron spectroscopy (XPS) can provide more detailed structural insights.
HYDROGEN GAS PRODUCTIVITY FROM PEAT WATER ELECTROLYSIS WITH DISTILLED WATER INJECTED INTO AN INTERNAL COMBUSTION ENGINE (ICE) Julianto, Eko; Binyamin, Binyamin; Gunarto, Gunarto; Rahmadi, Apri; Iwan, Muhammad
Media Mesin: Majalah Teknik Mesin Vol. 26 No. 1 (2025)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v26i1.5419

Abstract

Hydrogen gas is one of the alternative fuels that is currently being widely researched. HHO generator is a tool with the working principle of water electrolysis and is used to produce hydrogen gas. In some studies, peat water has been considered to be used as an electrolyte. This research uses experimental methods to obtain hydrogen gas results from peat water electrolysis. The electrolysis reactor used can handle as much as 400 ml of peat water. The electrodes are stainless steel (SS) with a large cross-sectional area of 0.01884 m2. The electric power used was 12 Volts DC and the time in the electrolysis process was 1 minute. Based on the results of the research that has been done, among others, where the increase in HC in the exhaust gas in Aquades water looks very efficient at the initial rotation at 2000 rpm which produces a thermal efficiency of 60% While in peat water the increase in HC in the exhaust gas in Aquades water looks very efficient at the initial rotation at 2000 rpm which produces a thermal efficiency of 90%. The influence of rpm and the unstable rotation of rpm causes the CO value in the exhaust gas of the vehicle to be unstable where at low rotation readings 223. 24 ppm, middle 634.94 ppm and top 606.89 ppm, it can be seen that in the upper round the value even decreases from the middle round, while in HHO peat water when the low round reading is 104.4 ppm, middle 101.94 ppm and top 121.29 ppm, it can be seen that in the upper round the value increases from the initial round to the top.
THE EFFECT OF VARIATIONS IN PVC FOAM CORE THICKNESS ON THE FAILURE ANALYSIS OF BENDING TEST IN SANDWICH COMPOSITE Rodian, Afiko; Paundra, Fajar; Afisna, Lathifa Putri; Nurullah, Fajar Perdana; Pujiyulianto, Eko
Media Mesin: Majalah Teknik Mesin Vol. 26 No. 1 (2025)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v26i1.6108

Abstract

The composite sandwich core is one of the parts that act as an additional material. Despite the thinner core, it should produce a stiff, strong, and lightweight composite, and the higher the bending strength value obtained. This study aims to observe and analyze the influence of core thickness on bending strength and obtain elastic modulus as well as analyze the results of sandwich composite fracture after bending testing. The materials used are polyester resin, 240 gsm twill carbon fiber and core PVC foam. Variations in core thickness of 2 mm, 3 mm, 5 mm, 8 mm, and 10 mm. The method used is vacuum bagging. The tests carried out are bending tests using the ASTM C393 standard. The bending strength value of sandwich composite was obtained at a core thickness variation of 2 mm, which was 81.34 MPa, while the lowest bending strength value was found in a core thickness variation of 10 mm, which was 13.08 MPa.

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