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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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Kota malang,
Jawa timur
INDONESIA
Rekayasa Mesin
Published by Universitas Brawijaya
ISSN : 23381663     EISSN : 24776041     DOI : 10.21776/ub.jrm
Core Subject : 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 306 Documents
Karakteristik Pembakaran Wood Pellet Stove dengan Variasi Geometri dan Blockage Ratio Flame Connector Yuliati, Lilis; Hamidi, Nurkholis; Sasongko, Mega Nur; Ibadurrohman, Ibrahim Ahmad
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.2019.010.03.13

Abstract

This research was intended to investigate the effect of the geometry and blockage ratio of the flame connector on the combustion characteristics of wood pellets on a wood pellet stove. Combustion characteristics observed in this research included flame visualization, flame temperature, specific fuel consumption, and corrected-specific fuel consumption. Two types of geometry were used as a flame connector, i.e. disk and cone; for each geometry, the blockage ratio was varied at 0,6, 0,7, and 0,8. The blockage ratio was varied by change the number of the circular hole on the flame connector. Combustion in wood pellet stove without flame connector was then used as a comparison. The flame visualization test was applied to find out the color and dimensions of the flame, which was then used to determine the temperature on this flame. The water boiling test method version 4.2.3 was used to determine specific fuel consumption and corrected specific fuel consumption. The combustion chamber of the wood pellet stove has a dimension of 15 cm diameter and 20 cm height. Wood pellet supply used intermittent - continuous feeding system with a mass flow rate of 16 gram/minute. Flame visualization shows that stove with cone flame connector has a larger flame dimension and flame dimension decreases with the increasing of blockage ratio. The highest flame temperature occurred near the outlet of the combustion chamber, the same conditions were observed in all variations experiment.  The application of flame connector involves greater specific fuel consumption due to longer boiling time. However, a correction factor by considering the amount of evaporated water results from corrected specific fuel consumption of wood pellet stove with cone flame connector which is smaller compared to the other type of wood pellet stove.
Evaluasi Faktor Intensitas Tegangan pada Ujung Retak dengan Lubang Penghambar Rambat Petak Purnowidodo, Anindito
Rekayasa Mesin Vol 1, No 1 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The evaluation of stress intensity factors in the crack tip interacting with stoping hole of crack growth was conducted by computer simulation, and this was carried out on vareid configuration of stopping hole. The results of the simulation show that the position and zise of stopping hole affect the magnitude of the stress intensity factor. The main cause of the fluctuation of the stress intensity factor is that the stoping hole configuration affects the interaction of stress in the vicinity of crack tip.Keywords : Hole Configuration, Stress Interaction, Stress Intensity Factors
Analisis Perpindahan Panas pada Saluran Berliku Berpenampang Segi Empat dengan Variasi Clearance Belokan Wahyudi, Slamet; Kurniawan, Aris; Hamidi, Nurkholis
Rekayasa Mesin Vol 1, No 1 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Heat transfer characteristics in rectangular with a sharp 180o turn have been examined experimentally using the naphthalene sublimation method. The sharp 180° turn was obtained by dividing a rectangular passage into two channels using a divider wall with a rounded tip at the location where the flow negotiates the turn. The channel cross-section (WxH) is 50×25 m, and three turn clearances of 30, 50, and 70 mm have been tested in this study. Local mass transferrates on all walls of the channel have been measured to clarify the heat transfer characteristics in the channel. The result indicated that the highest coefficient of heat transfer was achieved in the channel with turn clearances of 30 mm.Keywords: Heat Transfer Characteristics in Rectangular,Turn Clearances, Mass Transfers
Proses Pack Nitriding dengan Variasi Suhu dan Media Pupuk Nitrogen Terhadap Kekerasan AISI 420 Sulistyo, Erwin; Setyarini, Putu Hadi; Sudana, Yoni
Rekayasa Mesin Vol 1, No 1 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The aim of this research was to investigate the effects of heating temperature and concentration of nitrogen fertilizer, i.e urea and ZA, during pack nitriding to the surface hardnessof AISI 420. The process was done by heating the steel of AISI 420 with temperature varied between 4200C, 4700C, 5200C, 5700C dan 6200C for 6 hours after stress relieving in the pack fulfiled with urea or ZA. The result measured by microvickers hardness tester showed that the hardness increased as the function of the temperature.Keywords : pack nitriding, temperature, hardness, AISI 420, nitrogen fertilizer
Ampas Penyulingan Nilam Sebagai Bahan Bakar Alternatif Pada Proses Produksi Minyak Nilam Sugiarto, Sugiarto; Sulistyo, Erwin
Rekayasa Mesin Vol 1, No 2 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Remaining organic waste product of nilam oil distillation is a potential biomass as a fuel substitute for firewood. Utilization of waste distillation during refining is considered not yet optimal. Whereas by utilizing distillation waste will be obtained by the double advantage is decreasing the cost of production like reduction of the cost of purchasing firewood, waking environment from illegal logging and encroachment uncontrolled firewood and maintaining forest conservation. This research was conducted by varying waste of nilam distillation mixed fuel with firewood with a variation of 0%, 25%, 50%, 75% and 100% waste compared to firewood. Distillation capacity of each process is 60 kg of raw materials that have been chopped dried nilam. Dependent variables are sought in the form of heating value, temperature data in space heating, steam temperature and volume of nilam oil is produced for each variation of fuel weight fraction of waste nilam. The result is a solid fuel heating value increases with increasing weight fraction of waste nilam compared to the firewood. Zones heating temperatures and steam temperature fluctuated or not stable for all variations of fuel weight fraction of waste nilam. Steam temperature below 100 ° C which indicates the water content in the steam is still high. Time required for each distillation process with a capacity of 60 kg is still relatively long time is 5 to 6 hours. Volume nilam oil products tend to increase with increasing weight fraction of fuel from the dregs of nilam. Keywords : Waste distillation of nilam, alternative fuel, nilam oil
Studi Inhibisi Formasi Kristal Es dengan Krioprotektan Sukrosa dan Glicerol Hamidi, Nurkholis
Rekayasa Mesin Vol 1, No 1 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

A large number of investigations have been carried out to understand the mechanism of freezing and mechanical damages in biological materials. Harmfull ice crystal has been proposed to be a factor causing injury to biological materials during the freezing. How to control,eliminate, or prevent the intracellular ice formation become an important research topic in fundamental cryobiology. Microscopic observation of the freezing process of onion epidermistissue have been made using a solidification stage in order to study the possibility ice crystal formation inhibition using glycerol and sucrose as a cryoprotectant. Experiments conductedunder cooling rates of 40oC/min and 70oC/min. The results indicated that the increasing glycerol can depress the freezing initiation temperature. However, vitrification of onion cells only can beachieved when we used high concentration of cryoprotectant (more than 70%vol sucrose(0.8M)+30%vol glycerol) with relatively rapid freezing (more than 70oC/min).Keywords : ice crystal inhibition, cryoprotectant, glycerol, sucrose
Pengaruh Variasi Jarak Alur Setengah Lingkaran Terhadap Penguatan Vorteng dan Penurunan Tekanan Pada Saluran Berpenampang Segi Empat Purnami, Purnami
Rekayasa Mesin Vol 1, No 2 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

This research was done by implementing a closed square cross section channel, where the bottom surface of the channel was semicircle transverse grooved. The frequency of flow oscillation measurement was done by setting up a resistance sensor that is Wheatstone bridge. A resistor of the Wheatstone bridge is place in to a manometer which was filled by water. The manometer is connected to the channel while the sensor is connected to ADC. A U manometer was used to measure the static pressure. Both measurements were done together at severals Reynold number. Based on the result it is seen that the maximum Strouhal number at Reynold number of 950. Vortex strength increases when Strouhal number increase where the largest vortex strength occurs at the smallest grooved distance with the increase of pressure drop. Oscillating shear stress increase with the increase of Reynold number. This phenomena indicated that highly transport momentum occurs as the Reynold number increase which it is contributed to the vortex strength and fluid exchange. Keywords : vortex, Reynold
Pemodelan dan Verifikasi Aliran Dua Fase (Air-Udara) di Belokan 90° Nugraha, Arif Yunizar; Soenoko, Rudy; Wahyudi, Slamet
Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Two phase flow in a piping installation is influenced by the interaction between phases, geometry and orientation (vertical or horizontal), flow direction (up or down) that may affect the flow pattern. In contrast to single phase flow which only influenced by the Reynolds number in the formula of density, viscosity and pipe diameter. So the two phase flow has an interesting phenomenon to be studied which is the result of the pressure drop to form a flow pattern. The purpose of this study are to determine the pressure drop that occurs in the 90° from the horizontal position to a vertical position, and to analyze the flow pattern of two-phase fluid (water-air) at 90° in computational simulation and visualization verified with the help of high-speed digital camera. This study used clear PVC pipe (CPVC) and acrylic (PMMA) material in the 90° curves--test section with the aim to observe the flow pattern visualization then analyzed through simulation modeling with ANSYS software and verified experimentally. The calculation of the pressure drop in the 90° curve calculated theoretically and experimentally so that research can be studied scientifically. There was relationship between the flow patterns of the amount of pressure drop in the two-phase flow curves 90° of the thickness of the interface. The bigger the thickness of the interface, the pressure drop decreases both theoretically and experimentally due to the friction between the interfaces associated with friction factor, in this case is influenced by the Reynolds number and its value is inversed so the greater proportion of the air volumetric (β) then the Reynolds water number (Re SL) will decrease and increases friction between phase, besides the back pressure in the curve also affect the thickness 90° interface.There is wavy flow or turbulence in the bottom of horizontal pipe when the flow is laminar, it because of gravitation and centrifugal force or twin eddy in the actual speed ratio ( 𝑣 𝐺 𝑣 𝐿) . The conditions influenced the flow pattern and pressure drop. The highest value of speed ratio ( 𝑣 𝐺 /𝑣 𝐿 ) is 1,824 at vSG 0,076 m/s and the lowest is 0,423 at v SG 0,025 m/s.Keywords: two phase flow; pressure drop; flow pattern and curves
Rancang Bangun Perajang Ubi Kayu Pisau Horizontal Lutfi, Musthofa; Setiawan, Sigit; Nugroho, Wahyunanto A.
Rekayasa Mesin Vol 1, No 2 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Cassava is an important source of food calories as well as source of other products in Indonesia. Utilization and processing potential of cassava are widely diverse. One of processed commodity of cassava is crispy chips. In crispy chips production, there need an efficiently and a good copper. The aim of this research is to design a cassava chopper powered by electrical motor and equipped with horizontal blade. Furthermore, this study aimed to identify the performance of designed chopper. The result of the design step is a chopper that has well functionally. The designed chopper has four parts; frame, transmission, hopper and cutter blade. It is powered by 0,25 kW electric motor and equipped with rotation speed control. In the design of the chopper with a horizontal blade, the cutting blades are not spinning stationary but changed into backward and forward movement. The highest specific energy as a result of performance identification is 42.50 Joules / kg. The highest working capacity is 62.550 kg / h occurs in motor rotation of 170 rpm. Keywords : Design, Chopper, horizontal blade, cassava, crispy chips.
Perilaku Tarik Baja Struktural dengan Variasi Laju Crosshead Murdani, Anggit
Rekayasa Mesin Vol 1, No 3 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The objective this research is to investigate the effect of crosshead speed on the tensile behavior of the structural steel which is presented in stress-strain diagram. The experiments were carried out by performing tensile testing of specimens with various crosshead speeds. The crosshead speed was determined by a dial position of 0.2, 0.5, 1, and 2 on the testing machine.In load-free condition, the dial positions give true speed of the crosshead of 0.042 mm/s, 0.27mm/s, 0.663 mm/s, and 1.354 mm/s respectively. The material used in this research is astructural steel which is comparable to the standard of DIN ST37. The result shows that the various crosshead speeds give a different response of the strain rate during the test. The strain rate, whic is resembled by the crosshead speed, begins to increase at the yield point. Also, theultimate stress of the specimens is affected by the crosshead speed. The ultimate stress of the specimens with dial position of 2 increases approximately 25% from that of with dial position of 0.2.Keywords : tensile behavior, crosshead speed, strain rate

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