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Redaksi Jurnal Rekayasa Mesin Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur Indonesia 65145
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INDONESIA
Rekayasa Mesin
Published by Universitas Brawijaya
ISSN : 23381663     EISSN : 24776041     DOI : 10.21776/ub.jrm
Core Subject : Engineering,
Mechanical Engineering
Rekayasa Mesin is published by Mechanical Engineering Department, Faculty of Engineering, Brawijaya, Malang-East Java-Indonesia. Rekayasa Mesin is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. Rekayasa Mesin accepts submission from all over the world, especially from Indonesia. Rekayasa 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 Rekayasa Mesin are the specific topics issues in mechanical engineering such as design, energy conversion, manufacture, and metallurgy. All articles submitted to this journal can be written in Bahasa and English Language.
Arjuna Subject : -
Articles 965 Documents
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Analisis Aliran Fluida Dua Fase (Udara-Air) melalui Belokan 45o Awaluddin, Awaluddin; Wahyudi, Slamet; Widodo, Agung Sugeng
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The phenomenon of two phase flow can be foundin our nature, at the living bodyand industrial of the world. The flow of Fluid throughthe pipe bendshave a valuegreater than thepressure dropstraight pipeit’s was because the changes ingeometryandtrajectorythathave an impact onthe changeof flowpattern. This research aims to determine of theflowpatternandtwo-phase flowpressure dropthat occursthrough the 45° elbowfrom the horizontalto theverticalslopes upward. Diameter ofthepipe(D) 26.64mm, variationsthatdoaregasflow rate(Q ) (1 - 3) LPMandgasvolumefraction (β) (25 - 50) %. From theresults ofthis research we can concludedthat theflowpattern thatoccursisthe slug/plugflowwhere the greaterthe gasvolumefraction (β), the size of theslug/plugflowgreaterandinversely proportional to thepressure dropfurtherdown. Upheaval of two-phase flow patterns due to the influence of gravity occurs at the actual speed ratio of air and water (v ) at 1 LPM air 0.713 and 0.966 at 3 LPM air. The highestpressure dropoccurswiththe condition ofthe gasvolumefraction (β) of 50 %, actual speed ratio of air and water(v G /v L ) 0.764at107.415 Pa in theoretically and 214.616Paat experimentally.Keywords: 45 o elbow, flow pattern, pressure drop.
Simulasi Pengaruh Excess Air terhadap Kinerja PLTU Kapasitas 12,5 MW pada Beban Bervariasi Simanjuntak, Melvin Emil
Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.9

Abstract

The excess air is required to complete the combustion of fuel in the boiler. The amount of excess air differs from each power plant. It depends on the characteristic of the fuel such as the type and size of the fuel particle, the type of boiler and the type of combustion. Excess air that is too little will increase the unburnt fuel and while too much will reduce the power plant’s performance. This study uses CycleTempo version 5.0 software to investigate the effect of excess air on the performance of a 12.5 MW steam power plant.  The fuel used is low-rank coal. The lower heating value of 16960.15 kcal. The composition of coal used is Carbon 45.74%, Hydrogen 2.68%, Moisture 20%, Nitrogen 0.46%, Oxygen 14.94%, Sulphur 0.19% and Ash 15.99%. The load on the turbine was varied by 70%, 80%, 90% and 100% from its design capacity. The excess air used starts from 0% to 50%, where the interval 10%. This study finds that the optimum excess air is approximated at 20%. The excess air over 20% will increase boiler ratings, net heat rate, air and fuel consumption. In reverse will reduce boiler efficiency and thermal efficiency. The changes of excess air did not affect the heat removed by the condenser and the power used by the pump.
Pengaruh Penambahan Fraksi Berat Zirconia terhadap Sifat Fisik dan Mekanik Komposit Aluminium Diperkuat Zirconia yang Diproduksi dengan Metalurgi Serbuk Wardhana, Bayu Satriya
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

This research aims to utilize zirconia (ZrO ) as a reinforcement of aluminum matrix composite (AMC). ZrO 2 2 powder of 0%, 2.5%, 5%, 7.5%, 10%, 12,5%, and 15% wt were added to fine aluminum powder (dimension of particles are smaller than 40 μm). Each composition was mixed using a turbula mixer for 2 hr. The mixture was uniaxially pressed with a pressure of 300 MPa to produce green bodies. They were pressure less sintered in argon atmosphere at temperature of 600ºC. Relative density, Vickers hardness, and bending strength of the AMC were tested. The results show that the hardness increases with increasing the ZrO content up to 5% wt whereas wear rate decrease. Relative density and Vickers hardness of composite containing 5% ZrO2 are 89%, 34 HV15 and 0.076 mg/(MPa.m), respectively. Maximum bending strength was reach on 7,5% ZrO adding on 37,66 MPa.Keyword : Aluminum Matrix Composite, zirconia, uniaxial compaction 2 2
Analysis of Physical and Mechanical Properties of Multiwalled Carbon Nano Tubes (MW-CNTs) Reinforced Mineral Composites as an Environmentally Friendly Machine Structure Setiyawan, Khanif; Sugiantoro, Bambang; Sutisna, Utis; Rusnaldhy, Rusnaldhy; Widyanto, Susilo Adi
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.14

Abstract

The Rigidity, absorption resistance, and vibration damping are important factors for the formation of static components and structures with excitation force loads. The development of new materials from composites for metal substitution has achieved better properties. The use of rocks with reinforcement CNTs can produce higher damping properties than metal casting, but young modulus is low. The Composite polymer material made from volcanic rock can be cast with epoxy with a variation of the aggregate ratio using compressive press able to improve mechanical properties. The volcanic rocks used in this study are granite, silica, and volcanic sand, using carbon nanotubes MW-CNTs as reinforcement. This research was conducted to produce structures with high strength and rigidity. The material are classified dimensions coarse (0,2-0,5 mm), medium (20 μm-50 μm), and fine (0.125mm/0.50 mm). Based on SEM/EDX test results of granite, silica, and volcanic sand have high silica content (with the sharp crystalline form that has the potential to strengthen the composite bond. The fly ash has high silica content, with round and fine crystals form. The specimen formation method refers to the dimensions of the composite specimen bending test according to ASTM D 645. The combination of materials that warns hardness and elongations, in separate tests of volcanic sand and granite which has the highest hardness, the use of CNTs can increase the hardness of 15% in each specimen, increase bending testing at 220% to 300%, prove that the inside of the crystalline bond forms ductile properties.
STRENGTH AND DIMENSION ACCURACY IN FUSED DEPOSITION MODELING : A COMPARATIVE STUDY ON PARTS MAKING USING ABS AND PLA POLYMERS Tanoto, Yopi Yusuf; Anggono, Juliana; Budiman, Wesley; Philbert, Kresna Vincent
Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.8

Abstract

Rapid prototyping is a group of techniques used to quickly scale physical parts or assemblies using three-dimensional computer-aided design (CAD) data. The process of 3D printing constructs three-dimensional objects from CAD models, usually by adding layers by a layer of material in a row. Therefore it is also called making addictive manufacturing. Along with the development of rapid prototyping, there are many choices of materials on the market to make parts of 3D printing. The material can be in the solid filament, liquid resin, or powder. Solid filament FDM technology material is the most commonly used by industry ? these materials such as ABS, PLA, PETG, HIPS, and others. In 3D printing products, several variables can be observed to produces specific responses desirable. Some of the responses are the efficiency of materials, dimensional accuracy of mechanical, and others. This research was conducted to compare ABS and PLA materials in the fused deposition modeling process. The strength and dimensional accuracy are the response that used in this study. The study reports that ABS has more significant tensile strength than PLA. The tensile strength of ABS is 7.66 MPa and 1.79 for PLA. PLA found has a more accurate dimension compare to ABS. Both on length and thickness, deviation of PLA lower than ABS. On a length, deviation of PLA was 0.06 mm and 0.86 for ABS. On thickness, deviation of PLA was 0.04 and 0.05 for ABS. 
Reaksi Cairan Jeruk Lemon (C6H8O7) dan NaoH terhadap Tegangan dan Arus yang Dihasilkan dengan Penambahan Katalis Karbon Aktif Amiruddin, Muhammad Agung; Irawan, Yudy Surya; Wardana, I Nyoman Gede
Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.13

Abstract

Lemon is an environmentally friendly electrolyte. However, an innovative concept is needed to improve the quality of lemon electrolytes. The purpose of this study is to investigate the effect of activated carbon catalyst addition on the voltage and current electric generated from liquid lemon (C6H8O7) and NaOH. Lemon juice group containing acetone (C3H5O) and 3 carboxylic acid group (COOH). The experimental study was performed using voltaic cells. The data measured is 125 ml of an electrolyte solution of lemon juice (C6H8O7) and NaOH 10 grams. To the solution was added 5 grams, 7.5 grams and 10 grams of activated carbon catalyst. The results showed that the addition of activated carbon can accelerate the breaking molecular bond NaOH and C3H5O (COOH)3 which decomposes into ions react with NaCH2COO + and Cu 2+ cathode into a reductant then OH- from NaOH reacts with the anode Zn2++2e be the oxidant While H2O react exothermically. Produces a voltage between 800-1130 mV second. It occurs when electrons flow from the anode interested Zn2+ + 2e react with H2O and of  Zn2+ + 2e electrons pass led and resistor toward the cathode Cu2+. Cathode Cu 2+ reacts with C6H8O7 and NaOH. The currents that produced ranged from 33.846 to 43.462 mA second. The mechanism of this voltage and current generation makes LED light was on.
Skema JCM (Joint Crediting Mechanism) pada Investasi Fasilitas Pemurnian Biogas di Pabrik Kelapa Sawit Febijanto, Irhan
Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.4

Abstract

Until now, the use of biogas in Palm Oil Mill (POM) is still limited to use as a fuel for Biogas Power Plant or utilize an additional boiler fuel. The use of biogas to be taken to other places is constrained by the remote location of POM and the transportation method. However, by converting biogas into bio-CNG, it can be used as vehicle fuel. The investment feasibility study of bio-CNG production facilities was carried out for two case studies, in POM with a capacity of 30 t/hr and 60 t/hr. The funding uses 100% of the equity fund and subsidy of the Joint Crediting Mechanism (JCM) scheme. Using the JCM scheme, the value of investment gets 50% funding assistance, and carbon credits from the reduction of Greenhouse Gas (GHG) emissions belong to the Japanese government. As a result of the study, it is known that the development of bio-CNG production facilities with 100% equity, IRR of both POM is below 11.08%, so it is not economically feasible. From the sensitivity analysis, it indicates that the increase in selling price of bio-CNG of +10%, a decrease in the investment of -10%, an increase in biogas input of +10% still cannot increase the Internal Rate of Return (IRR) value. Funding from JCM of 50% of the investment value increased the IRR value of 30t/hr and 60t/hr increasing from 6.54% to 18,29% and from 8.13% to 20.82%, respectively. The values of IRR became higher rather than the benchmark (IRR=11.08%). Carbon emissions reduction of the operation of the bio-CNG production facility and the use of bio-CNG for vehicle fuels in both of POMs are 38,735 tCO2/yr and 77,471 tCO2/yr, respectively. Using subsidy from carbon credits or other incentives will significantly help improve the economically feasible of bio-CNG production facilities in POM.
Pengaruh Kecepatan Udara pada Alat Pengering Jagung dengan Mekanisme Penukar Kalor Alit, Ida Bagus; Susana, I Gede Bawa
Jurnal Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.9

Abstract

The purpose of this study was to design and determine the performance of a dryer for drying corn with biomass burning energy sources. The dryer consists of a biomass stove, a heat exchanger, and a drying cabinet. The dimensions of the biomass stove are 500 x 500 x 800 mm with a diameter and hole distances of the biomass stove wall is 10 mm and 50 mm, respectively. The heat exchanger pipe diameter is 25.5 mm, the drying cabinet 500 x 500 x 600 mm, and the biomass was rice husk. The heat exchanger is made of stainless steel pipes arranged in a parallel arrangement. A heat exchanger pipe connects the biomass stove to the drying cabinet in order to avoid drying products from burning biomass contamination. The results showed that the drying rate could be faster if the air velocity increases. Drying corn in order to reduce water content from 19% to 12% takes 47 minutes with an air velocity of 3 m/s.
KARAKTERISTIK PEMBAKARAN DROPLET DENGAN VARIASI KOMPOSISI CAMPURAN BENSIN - ETANOL Arwin, Arwin; Yuliati, Lilis; Widodo, Agung Sugeng
Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.1

Abstract

The objective of this research is to investigate the droplet combustion characteristics of gasoline-ethanol fuel blended. The combustion characteristics included ignition delay time, burning lifetime, burning rate constant, flame height, flame temperature, and microexplosion. Testing was conducted using fuel blended with ethanol percentage of 0%(E0), 10%(E10), 20% (E20), 30% (E30) and 100% (E100). The fuel was dripped on the tip of the thermocouple junction and ignited using a torch of a butane-air mixture on a cylindrical burner. The results showed that the ignition delay time increase with the increase of ethanol percentage due to its high latent heat of evaporation and flash point temperature. However, flame temperature decrease with the increase of ethanol percentage due to the lower heat release rate of the mixture, related to the lower heating value of ethanol, and the burning rate constant of the fuels were not different significantly. The droplet diameter of the E100 (pure ethanol) decrease according to the d2?law, but the droplet diameters of the E0, E10, E20, and E30 changed drastically, exhibiting expansion and shrinkage. The Combustion of E20 fuel droplet has the highest burning rate constant, and flame height due to the oxygen content in ethanol can accelerate the combustion reaction and the fastest fuel droplet evaporates and diffuses into the air. Besides, the combustion of the E20 fuel droplet has the lowest burning lifetime due to the intensity of the microexplosion often makes the fuel droplet break into small droplets, which helps accelerate the process of evaporation and mixing of fuel with air, so that the combustion reaction occurs faster. Microexplosionphenomenon also identified due to the difference between the boiling point temperature gasoline and ethanol. 
Analisa Struktur Mikro dan Kekuatan Bending Sambungan Las TIG dengan Perbedaan Kuat Arus Listrik pada Logam Tak Sejenis Aluminium Paduan 5052-Baja Galvanis dengan Filler Al-Si 4043 Bintarto, Redi; Widodo, Teguh Dwi; Raharjo, Rudianto; Ma’arif, Moh. Syamsul; Dewi, Francisca Gayuh Utami; Pratama, Gesha Denny
Jurnal Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.14

Abstract

This study aims to determine the various effect of heat input due to varied electric current on microstructure of the weld joints and the bending strength of 2 dissimilar metals (aluminum alloy 5052 and galvanized steel) with Al-Si 4043 as filler. This experimental research was worked out by varying the strength of the current which can then be calculated into a heat input. The current inputs applied were 30.8 J / mm (70A), 35.2 J / mm (80A) and 39.6 J / mm (90A) while the protective gas flow rate used is 14 liters / minute. This study showed that the increase in heat input greatly affects the shape of the weld area microstructure, i.e. the microstructure and bending strength. Greater heat input due to higher current can melt larger area, so that the join process occured better. The highest bending strength at 9.05 Mpa was achieved for heat input at 39.6 J / mm or strong current of 90 A. The weakest bending strength at 8.88 Mpa was achieved for heat input at 35.2 J / mm or a strong current of 70 A.

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