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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 22 Documents
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EFFECTS OF CONTINUOUS AND FRACTURED RIBS PLACED AT THE ENDWALL SURFACE UPSTREAM OF THE TURBINE-VANE LEADING-EDGE Shote, Adeola Suhud; Aasa , Samson Abiodun; Olakoyejo , Olabode T; Bamiduro, Aderemi Musiliudeen
Media Mesin: Majalah Teknik Mesin Vol. 25 No. 2 (2024)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v25i2.4349

Abstract

Total pressure loss, chaotic and heavy flow downstream of the turbine passage exit area are a few effects of the desired increase in inlet temperature input at the upstream part of the turbine vane passage. Huge amount of energy from the cross-flows near the middle of the vane actual chord are transported downstream by this chaotic flow which often results in aerodynamic loss and differential heat penalties. To compare the different arrangement, comparisons of the two geometries, the impact of adding various rib configurations upstream are studied for heat augmentation efficacies. The leading-edge rib(s) effects at the mid-stream of the vane passage are quantitatively examined in this work using computational fluid dynamics (CFD) technique. With the employment of Reynolds Averaged Navier-Stoke energy equations, the geometries are modelled choosing the appropriate boundary conditions. Polyhedral mesh is used with fifteen prism layer mesh at the endwall and vane surfaces to capture the flow physics close to the endwall area. Although the two configurations employed showed relative reduction in the total pressure loss coefficient, however, the fractured ribs produced superior outcomes of Nusselt number reduction of over 10% along the passage exit region. The data demonstrate a considerable difference in the overall pressure loss between the two configurations.
STUDY OF INNER AND OUTER POCKET CHARACTERISTICS USING AREA ROUGHING METHOD Suryono, Edy; Kristiawan, Y. Yulianto; Raharjo, Emanuel Budi; Siburian, Jonas Andika; Fajar, Jodi Muhammad
Media Mesin: Majalah Teknik Mesin Vol. 25 No. 2 (2024)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v25i2.4628

Abstract

Pocket milling is one of the CNC milling processes. This research aims to analyze the characteristics of pocket milling using Area Roughing on surface roughness and machining time. The method applied is experimental research on the Area Roughing method for working on inner and outer pockets. Research variables include depth cut 0.5, 1, 1.5, and 2 mm, stepover percent 40, 50, and 60%. The test is in the form of surface roughness value, while the analysis of the machining process is the time during the milling process. The workpiece material is 2024 aluminum and a flat endmill tool with a diameter of 12 mm. The expected result is the parameter that has the most optimal value for the processing time and surface roughness value. So it can be a guide for milling processes, especially those that use Area Roughing. The machining results show that the faster machining time results from larger settings for depth cut and stepover percent. Average machining time increase of 28%. Meanwhile, the surface roughness value will increase as the depth cut and stepover settings increase, namely 17.65% for the outer pocket and 18.61% for the inner pocket. The surface roughness value of the ordering results ranges from 2.4-4.8 µm.
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.
IMPACT OF CHEMICAL REACTION ON MHD BOUNDARY LAYER FLOW OF NANOFLUIDS OVER A NONLINEAR STRETCHING SHEET WITH THERMAL RADIATION HAAR WAVELET COLLOCATION METHOD N, MAHESH KUMAR; Awati, Vishwanath B; Goravar, Akash
Media Mesin: Majalah Teknik Mesin Vol. 25 No. 2 (2024)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v25i2.5146

Abstract

In this paper, we investigate the effects of chemical reaction and thermal radiation on MHD boundary layer fluid flow of nanofluid moving over a nonlinearly stretching sheet through semi-numerical approach. The nanofluid physical model of the problem comprises with effects of thermophoresis, radiation and chemical reaction parameters. The mathematical model scrutinizes mass, momentum, heat transfer and concentration equations are reduced to couple nonlinear ordinary differential equations over infinite domain using proper similarity variables. Haar wavelet collocation method is used to solve the resulting equations. The obtained results are compared with available numerical findings and are comparable which confirms and verifies the wavelet method. The effects of various non-dimensional parameters on the rate of heat and mass transfer are depicted through tables and graphs. It predicts that, the local Sherwood number increases with increase in the parameters of Brownian motion and thermophoresis. For both temperature and volume fraction profiles decreases due to an increase in the Schmidt number.
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.
OPTIMIZING PROCESS PARAMETERS FOR FILAMENT 3D PRINTING USING THERMOPLASTIC POLYURETHANE (TPU) WITH RESPONSE SURFACE METHODOLOGY (RSM) Salbiah, Umi Khulsum; Shieddique, Apang Djafar; Rohman, Rohman
Media Mesin: Majalah Teknik Mesin Vol. 26 No. 2 (2025)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

3D Printing utilizes the fabrication process of Fused Deposition Modeling (FDM), which is an Additive Manufacturing (AM) technology that builds objects layer by layer (Pristiansyah et al., 2019). The use of 3D Printing technology has rapidly increased in recent years, significantly contributing to the quality and cost efficiency of prototype production. TPU (Thermoplastic Polyurethane) filament is often used because it produces heavier, harder, and more durable products. Optimizing the 3D printing process is crucial to achieving optimal results, one of which is through the Response Surface Methodology (RSM) method. In this study, RSM was used with 2 factors to find the best response in tensile strength and material hardness of TPU. The experimental results showed that the optimal parameters for tensile strength are a temperature of around 190°C and a print speed of 45mm/m, resulting in a tensile strength of 2.34 kgf/mm². Meanwhile, for maximum hardness, the optimal parameters are a temperature of 214.15°C and a print speed of 45mm/m, with a hardness value of 72.67 HRR. Thus, the RSM method can be an effective approach in improving the 3D Printing results on TPU material.
NUMERICAL AND ANALYTICAL ANALYSIS OF THE SHAFT DESIGN FOR A ROTATING DRUM BIOREACTOR USING STAINLESS STEEL 304 MATERIAL Putero, Gladion Alim; Affandy, Rahmat; Fauzi, Mochamad; Zain, Fikri Isya; Prabawanto, Moch. Nur Irsyad; Faizin, Ahmad Khairul
Media Mesin: Majalah Teknik Mesin Vol. 26 No. 2 (2025)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The safety factor and Von Mises stress need to be analyzed so that the components remain safe against combined stress and the risk of failure due to dynamic loads and unexpected conditions. This study aims to analyze the safety factor and von mises of the shaft design on a rotating drum bioreactor using 304 stainless steel material. This machine is designed to support the shrimp paste fermentation process using the Solid State Fermentation (SSF) method. The analysis process is carried out through simulation using the finite element method (FEM) to evaluate the stress distribution and safety factor value on the shaft. The simulation results show that the von mises value or maximum stress on the shaft is 10.98 N/mm², still below the yield strength of 304 stainless steel material of 205 N/mm². The minimum safety factor obtained from the analysis is 19, indicating that this design is safe to withstand loads during the operation process. In addition, the results of the numerical analysis using manual calculations obtained a maximum shaft stress value of 10.95 N/mm² with a minimum safety factor value of 18.7. Through a comparison of the results of the analytical simulation analysis and manual numerical calculations, a machine design with a level of reliability and structural safety that is considered safe, as well as minimizing the risk of mechanical failure.  
DEVELOPMENT AND ANALYSIS OF A 7040 PROPELLER AIRSCREW TEST BENCH USING EXPERIMENTATION AND CFD Sarjito, Sarjito; Prabowo, Anggit Bayu; Wijianto, Wijianto; Junaidin, Buyung
Media Mesin: Majalah Teknik Mesin Vol. 26 No. 2 (2025)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v26i2.12059

Abstract

This study presents a performance evaluation of a 7×4 propeller using both experimental and computational approaches. A test bench was developed to measure static thrust and power consumption across various rotational speeds (RPM), while Computational Fluid Dynamics (CFD) simulations were performed using ANSYS CFX to analyze the aerodynamic behavior and thrust generation under identical conditions. The experimental setup employed an Arduino-based system integrated with sensors for thrust, voltage, current, and RPM measurements. Thrust values increased proportionally with RPM, reaching a maximum of 2.7468 N at 9000 RPM. In comparison, the CFD simulation predicted a higher thrust of 3.6358 N at the same speed. Although some deviations were observed—particularly at higher RPMs—the overall trends between experimental and CFD results were consistent, indicating that both methods effectively capture the propeller’s performance characteristics. The findings confirm that the test bench provides reliable measurements under static conditions and that CFD can serve as a predictive tool for propeller performance. Further improvements through dynamic testing and simulation refinement are recommended to enhance accuracy and represent real-world flight conditions.

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