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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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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.
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Articles 12 Documents
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Search results for , issue "Vol 6, No 1 (2015)" : 12 Documents clear
Purifikasi Biogas dengan Variasi Ukuran dan Massa Zeolit terhadap Kandungan CH4 dan CO2 Widhiyanuriyawan, Denny; Hamidi, Nurkholis; Trimandoko, Candra
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (515.64 KB) | DOI: 10.21776/ub.jrm.2015.006.01.4

Abstract

Nowadays, the development of the renewable energy very rapidly. It is driven by the nature of the renewable energy that has been proven to be cleaner than conventional energy, so an increase in the use of renewable energy continues to rise. Biogas is produced from biological processes (anaerobic digester) is capable of producing gas such as CH 4 , CO 2 , H 2 S, and other gases. Therefore it is very important to make the process of refining the biogas. In this research, using the biogas purification process purification method stratified, with a solution of sodium hydroxide with zeolite is purified again and again purified with activated charcoal, hence the storied purification. In this study focused on the observation of zeolite as an adsorbent, the size of the fine and coarse zeolite, and zeolite are varied mass of 50 grams, 100 grams and 150 grams. In 60 minutes, the best result obtained on zeolites fine size with a mass of 150 grams of CO 2 obtained down to 4.07%, but the pressure dropped to 0.65 kPa. With the size of the coarse zeolite at 4.26% CO 2 , with a pressure drop of 0.84 kPa. After the purification process, zeolite proved to be hidrofill with the content of the zeolite fine biggest water with 5.4%.
Pengaruh Temperatur Terhadap Entalpi dan Kinetic Rate Gas Pirolisis Kayu Mahoni Suwandono, Purbo; Wijayanti, Widya; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (563.683 KB) | DOI: 10.21776/ub.jrm.2015.006.01.9

Abstract

This study was conducted to determine the effect of temperature on gas enthalpy and kinetic rate of mahogany wood powder pyrolysis results. Research process carried out experimentally with the temperature 673 K, 773 K, 873K, 973 K and 1073 K. Pyrolysis process is carried out for 2 hours with a particle size of sawdust from 0.5 to 1 mm. The results showed that the enthalpy value increase as the temperature increase. Highest enthalpy value achieved at 1073 K, with enthalpy value is 35015.97J.Kinetic rate for temperature 873 K, 973 K and 1073 K is 𝑘 = 1,484𝑒 −2759/𝑇 , kinetic rate for temperature 673 K and 773 K is 𝑘 = 16,5306𝑒 −5368/𝑇 and 𝑘 = 3,0373𝑒 −2980/𝑇 respectively. As the temperature increase, activation energy (Ea) to decompose biomass into gases is decrease.
Pengaruh Fraksi Volume Dan Panjang Serat Pelepah Lontar (Borassus Flabellifer) Terhadap Kekuatan Tarik Dan Kekuatan Impak Komposit Bermatrik Epoksi Tuati, Amros Alfonsius; Purnowidodo, Anindito; Sonief, Achmad As’ad
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (425.362 KB) | DOI: 10.21776/ub.jrm.2015.006.01.5

Abstract

This study was conducted using epoxy resin as ligature and midrib lontar fibers (borassus flabellifer) as brace. Composite was made by varied fiber volume fraction 10%, 30% and 50% with length variation 10 mm, 20 mm, and 30 mm. The composite production used hand lay-up method. The test result showed the highest composite tensile strength about 31.607 Mpa in volume fraction 10% with fiber length 30 mm. The lowest composite tensile strength was about 16.855 Mpa in fiber volume fraction 10% and 20 mm in fiber length. Moreover, the highest composite impact strength was 0.00163 J/mm in fiber volume fraction 50% with fiber length 30 mm and the lowest impact strength was 0.00214 J/mm 2 in fiber volume fraction 10% and 10 mm fiber length. The kind of composite fracture tended to have brittle fracture with mechanism of fiber pull out.
Jarak Optimum Panci Terhadap Selubung Pada Efisiensi Sistem Pemanasan Air Widodo, Agung Sugeng
Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (755.476 KB) | DOI: 10.21776/ub.jrm.2015.006.01.10

Abstract

Energy conservation from fossil fuel is urging to be implemented recently, including conservation in a conventional gas stove (CGS). Considering the mechanism of a CGS, there are many prospects to enhance its performance. In this study, efficiency of a CGS has been investigated by varying the gap between pan and stove cover. Many parameters were measured as energy from fuel, cover temperature and water temperature to develop efficiency equation of heating system. Ceramic cover was used to prevent heat release from flame. Gaps between pan and stove cover were varied in 1 mm to 7 mm with increment of 1 mm. The results showed that in certain fuel rate of 45 l/h, the gap of 4 mm indicated the highest efficiency of 46.4 % due to the optimum condition was achieved simultaneous in convection and radiation heat transfer processes of the heating system.
Parameter Kinetik Char Hasil Pirolisis Serbuk Kayu Mahoni (Switenia Macrophylla) dengan Variasi Heating Rate dan 1 Temperatur Majedi, Farid; Wijayanti, Widya; Hamidi, Nurkholis
Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (540.059 KB) | DOI: 10.21776/ub.jrm.2015.006.01.1

Abstract

The value of k (rate constant) is one of the important parameters in the equation speed of reaction (kinetics of reactions). This paper discusses the value of k (rate constan) at each heating rate (673 K / h and 873 K / h). Where k is the value obtained by calculating the value of k temperature 523 K, 623 K, 723 K, 773 K and 873 K heating rate of 673 K / h and k values of temperature 523 K, 623 K, 723 K, 773 K and 873 K heating rate 1073 K / h. From the k value of each temperature, calculated values of k in the heating rate. Calculation results obtained kinetic parameters heating rate of 673 K / h Kinetic is 𝑘 = 24,022 . 𝑒 −1230 𝑇 ⁄ , Ea = 10226.2 kJ Mol -1 , A = 269.4548 min -1 and a heating rate of 1073 K / h is 𝑘 = 8,998 . 𝑒 , Ea = 6550.6 kJ Mol -1 , A = 100.9273 min . From the k value of each heating rate validated into the mass loss is calculated, which obtain the actual mass loss results with the mass loss calculation results of kinetic equations for each temperature and heating rate can be seen that the value of mass loss value calculation results is approaching mass reduction so the actual kinetic equation respectively temperature and heating rate. Rate constan) is one of the important parameters in the equation speed of reaction (kinetics of reactions) -1
Pengaruh Variasi Temperatur Terhadap Kuantitas Char Hasil Pirolisis Serbuk Kayu Mahoni (Switenia Macrophylla) Pada Rotary 39 Kiln Qiram, Ikhwanul; Widhiyanuriyawan, Denny; Wijayanti, Widya
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (407.796 KB) | DOI: 10.21776/ub.jrm.2015.006.01.6

Abstract

Pirolysis is thermochemical decomposition process of biomass into useful product. One kind of method that can be used is a Rotary Kiln pirolyzer which is consist a heating cylinder that rotates with a certain rotation speed. This research is aimed to get the effect of temperature due to Char product quantity of switenia macrophylla Rotary Kiln pirolysis.The research has done by pirolysis experiment with 200 gram of switenia macrophylla in dust form. Temperature was varied 250 C, 350 o C, 450 o C, 500 o C, and 600 C. The heating temperature was provided by eletric heater with control system. Temperatur was measured with K type thermocouple. The heating process has taken for 180 minutes using stopwatch. The measurement has done for biomass and Char volume using measuring cup. Mass was measured by using mass scale. Low heating value was measured by using bomb calorimeter. The result show that the temperature has effect due to Char product of switenia macrophylla Rotary Kiln pirolysis. The loss of Char mass is tend to increase due to temperature increases. Low heating value and Char porosity is tend to increase due to mass loss percentage increases. Shrinking factor and percentage of yield energy is tend to decrease due to mass loss percentage increasing.
Analisis Penyerapan Energi Dan Pola Deformasi Crash Box Dengan Variasi Sudut Tirus Dinding Crash Box Pada Uji Simulasi Tabrakan Arah Frontal Choiron, Moch. Agus; Darmadi, Djarot B.; Anwari, Bintang Rahmaddian
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1518.226 KB) | DOI: 10.21776/ub.jrm.2015.006.01.11

Abstract

Sistem transportasi merupakan salah satu kebutuhan yang penting untuk dipenuhi dalam mempermudah kehidupan pada zaman modern ini. Di sisi lain, meningkatnya kebutuhan akan hal tersebut juga akan ikut meningkatkan produksi kendaraan yang secara tidak langsung turut meningkatkan jumlah kecelakaan. Meninjau hal tersebut, standar keselamatan kendaraan yang lebih baik sangat dibutuhkan, salah satunya adalah crash box. Crash box merupakan sistem keamanan pasif yang digunakan untuk mengurangi tingkat keparahan kecelakaan yang dialami penumpang atau bagian kendaraan yang vital akibat tabrakan. Penelitian ini meninjau pengaruh variasi sudut tirus dinding crash box berpenampang lingkaran (circular) terhadap pola deformasi dan penyerapan energi pada uji simulasi tabrakan arah frontal. Penelitian dilakukan dengan software berbasis metode elemen hingga (MEH). Variasi yang digunakan dalam penelitian ini yaitu crash box dengan sudut tirus (α) 0,2°; 0,4°; 0,6°; 0,8; dan 1,0° dengan material crash box baja AISI 1340. Dari hasil penelitian diperoleh bahwa pola deformasi yang terbentuk adalah pola aksial dengan mode concertina dan campuran (concertina + diamond). Deformasi mode campuran terjadi pada crash box t a 1,6 α 0,0°; α 0,8°; α 1,0°. Penyerapan energi meningkat seiring bertambah besarnya sudut tirus dinding crash box, dengan kemampuan menyerap energi terbesar pada crash box dengan sudut tirus (α) 1,0° sebesar 10823 J. Semakin besarnya sudut tirus dinding crash box juga menunjukkan peningkatan penyerapan energi spesifik crash box.
Rancang Bangun Model Alat Uji Teras Reaktor Nuklir Small Modular Reactor (SMR) Dengan Fluida Pendingin H2O Untuk Kondisi Konveksi Paksa Ramadhan, Anwar Ilmar; Dermawan, Erwin; Diniardi, Ery; Arifangga, Muhammad
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (950.802 KB) | DOI: 10.21776/ub.jrm.2015.006.01.2

Abstract

Heat transfer performance poor will have a negative impact on the reactor system which in turn could affect the release of radioactive substances into the surrounding environment so as to endanger the safety of the environment and living things that exist around the reactor. The purpose of this research is to create or design a testing tool wake models in a nuclear reactor core in a laboratory scale assuming cylindrical heat derived from the electrical energy that does not harm the environment. The method used in the completion design of the reactor core model of test equipment is the study of literature, making the concept design and subsequent testing tool designing wake. Once the design is complete, the next stage of the operation of test equipment to determine the performance of the test equipment. The comparison between experimental simulation on the condition of forced convection heat flux 500000 W/m2 at a speed of 0.3 m/s produces fluid temperature difference between 0.00001 K to 0.8 K. In natural convection comparison between experimental results with simulation the heat flux 500000 W/m2 at a speed of 0.3 m/s resulted in the difference between the 0.1 K to 28 K. The smaller the fluid temperature differences between the experimental simulations, the better the performance of the test equipment.
Pembakaran Premixed Minyak Nabati pada Bunsen Burner Type Silinder La Muhaya, Syamsul Bahri; Wardana, ING.; Widhiyanuriyawan, Denny
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (642.074 KB) | DOI: 10.21776/ub.jrm.2015.006.01.7

Abstract

In the premixed combustion wave propagation combustion occurs is called the flame front. Premixed flame will propagate at the speed of moving towards the reactants unique. If the speed of the reactants is equal to the speed of propagation of fire, the fire (reaction zone) will be stationary. It is necessary to follow up on the influence of equivalence ratio (φ) varied with laminar flame speed (SL) in the premixed combustion of vegetable oil (virgin coconut oil, jatropha and cotton seeds). Research using experimental (true experimental research), which is put through direct observation by the equivalence ratio (φ), 1.5, 1.6, 1.7 and 1.8 m / l, to determine the causal relationship. Then the results showed a pattern of fire Bunsen burner pure coconut oil with equivalence ratio (φ), namely: 2.00, 1.87, 1.78, and 1.66, jatropha oil with equivalence ratio (φ) are: 1.73, 1.62, 1:52, and 1:44 and seed oil kapok with equivalence ratio (φ) are: 1.76, 1.65, 1:55, and 1:46, the richer the air the flame pattern that looks smaller and smaller until the blow off. This happens because the richer the air causes the fuel has an air excess so that the fuel (fuel) burning diffusion semakain reduced and cause combustion close to the surface of the tip of the nozzle Bunsen burner to high flame formed shorter until there blow off or extinguished.
Karakteristik Pembakaran Difusi Campuran Biodiesel Minyak Jarak Pagar (Jathropha Curcas L) - Etanol/Metanol Pada Mini Glass Tube Al Banjari, M. Arsad; Yuliati, Lilis; Sonief, Achmad As’ad
Jurnal Rekayasa Mesin Vol 6, No 1 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (985.498 KB) | DOI: 10.21776/ub.jrm.2015.006.01.12

Abstract

Diffusion is a combustion which is performed on a diesel engine, biodiesel as a biofuel is used to replace fossil fuels. Many studies have looked at the effect of a mixture of biodiesel fuel-ethanolmethanol-diesel with different percentages in terms of engine performance and exhaust emissions, but have never done research on the characteristics of combustion and interface evaporation. This paper discusses how the comparison of the characteristics of the diffusion combustion mixture of biodiesel and biodiesel-ethanol-methanol in mini glass tube. The results showed that the use of biodieselethanol occurred many explosions flame and lift off than biodiesel-methanol. Biodiesel-ethanol evaporation interfaces tend to be flat because there were many explosions so that the liquid fuel out of the burner. The use of biodiesel-methanol flame produces more stable than biodiesel-ethanol.

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