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All Journal Jurnal Ilmiah WUNY Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Rekayasa Mesin Journal of Enviromental Engineering and Sustainable Technology International Journal of Mechanical Engineering Technologies and Applications (MECHTA)
Purnami Purnami
Brawijaya University
Humanities Automotive Engineering Computer Science & IT Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Public Health

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Journal : Rekayasa Mesin

 1 
Pengaruh Pengunaan Katalis Terhadap Laju Dan Efisiensi Pembentukan Hidrogen Purnami, Purnami; Wardana, ING.; K, Veronika
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 (794.48 KB) | DOI: 10.21776/ub.jrm.2015.006.01.8

Abstract

Hydrogen was produced by steam reforming of kapok seed oil. CuZn as catalyst helps accelerate separation and increase production of hydrogen gas. This catalyst is viable and has high stability. Hydrogen gas was produced through 3 steps of catalyzing by mixed kapok seed oil and water with ratio of 1:1, 1:3 and 3:1. Heating temperature of catalyst at 250 C was selected. The rate and efficiency in forming of hydrogen gas were evaluated. From present investigation show that the more steps of catalyzing resulted in higher products, production rate, and efficiency in forming of hydrogen gas. Using 3 steps of catalyzing has promoted higher products, production rate, and efficiency in forming of hydrogen gas compared to 1 step and 2 step of catalyzing.
Studi Numerik Pengaruh Variasi Jumlah Saluran Masuk Pressure Swirl Atomizer Terhadap Karakteristik Spray Purnami, Purnami
Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

This research was conducted to determine the effect of inlet channel number on the spray characteristics of the pressure swirl atomizer using numerical methods. The observed spray characteristics were spray cone angle and discharge coefficient. Pressure swirl atomizer is a nozzle that can atomize fluid using vortex fluid in the mixing chamber, the magnitude of the vortex fluid is affected by the tangential velocity component of fluid at the nozzle inlet. Number of nozzle inlet was varied at 1, 2 and 4 channel. Total surface area of the inlet was kept constant of 1.76 mm 2 for all variation. The fluid used in this study were diesel and Reynolds number was varying at 2000, 2500, 3000, 3500 and 4000. The result show that with the increasing of inlet channel number at a fixed Reynolds number will generate spray with larger spray cone angle. This is due to tangential velocity compunentand swirling flow in mixing chamber increasewith the increasity of inlet channel number. This phenomena ruselt higher spray cone angle. Discharge coefficient also increase with the increasity of inlet channel number. This conditionshow that losses inside nozzle with 4 inlet channel number is smaller than that with less inlet channel number.Keywords: Pressure swirl atomizer, Spray characteristics, Amount of inlet channel, Numerical method.
Pengaruh Variasi Tebal Sudu Terhadap Kinerja Kincir Air Tipe Sudu Datar Wahyudi, Slamet; Cahyadi, Dhimas Nur; Purnami, Purnami
Jurnal Rekayasa Mesin Vol 3, No 2 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Waterwheel is a means to change the water energy into mechanical energy in the form of torque on the wheel shaft. Working waterwheel by the large flow and high utilization of water falls. Today the water wheel still has a small efficiency when compared to water turbines that exist at the moment. Therefore, it still needs further research to improve the efficiency of the water wheel. The purpose of the study is to determine the performance of the blade thickness variation waterwheel flat blade type. In this study, using a kind of overshot waterwheel with a thickness variation of different blades of 0.3; 0.6; 0.9; and 1.2 cm and a water capacity of 10-20 m3/hr. Furthermore be obtained shaft power and efficiency of the water wheel. By using statistical analysis showed that the shaft power and efficiency is influenced by variations in thick blade. In this test shaft power and highest efficiency artifacts on blade 0.3 cm thick.Keywords: windmill water, the thickness of the blade, the performance
Pengaruh Variasi Sudut Static Mixer Terhadap Kinerja Heat Exchanger Widhiyanuriyawan, Denny; Purnami, Purnami; Ardiansyah, Ardiansyah
Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

This study was proposed to determine the effect of static mixer on innertube installation of double pipe heat exchanger. The dimenssion of outer (hot fluid) and inner (cold fluid) pipes of heat exchanger were 76.2 mm and 25.4 mm, respectively. Static mixers with 19 mm diameter and 60 pieces number were variated with θ=40o, 80o, and120o. The hot fluid discharges were variated from 400 to 900 liters/hour and the constant of cold fluid discharge with 900 liters/hour. The results show the heat transfer rate of statics mixer with angle variation higher than plain tube (without static mixer).The heat transfer increased 24%, 39%, and 44% for variation angel of static mixer with θ=40o, 80o, and 120o, respectivelly.Keywords: Static mixer, heat transfer rate
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
Perbandingan Interaksi Karbon Aktif dengan Polaritas Minyak Nabati terhadap Karakteristik Pembakaran Premixed Purnami, Purnami; Wardana, I Nyoman Gede
Jurnal Rekayasa Mesin Vol 12, No 1 (2021)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2021.012.01.9

Abstract

Crude oil consumption has increased since the discovery of crude oil-fueled engine technology. However, the increase in crude oil consumption is not offset by the productivity of the product. This results in a reduced availability of crude oil. One solution found was to use alternative fuels from vegetable oils. Several researches have proven that vegetable oils can be used as fuel. The results of the research found potential in jatropha oil and palm oil. However, jatropha oil and palm oil contain glycerol compounds which can affect the results of its combustion, because glycerol can absorb heat and result in firing more difficult. Based on that, modification and development are needed to support the use of jatropha oil and palm oil as alternative fuels by studying oil polarity and adding catalysts for coconut shell-activated carbon. Jatropha oil has low polarity (C18) which is more volatile than palm oil which has high polarity (C13). The variation used in this research is the addition of activated carbon with a concentration of 0 ppm, 200 ppm, and 400 ppm in each oil. The addition of activated carbon will facilitate evaporation because oil molecules become more reactive more freely.
Co-Authors Abdul Mudjib Sulaiman Ahmad Najih Daroini ARDIANSYAH ARDIANSYAH Dekrit H. Akbar Denny Widhiyanuriyawan Dhimas Nur Cahyadi Dina Novera Serfandi Hogi Syahputra I Nyoman Gede Wardana ING. Wardana, ING. Mega Nur Sasongko Nurkholis Hamidy Putu Hadi Setyarini Sifa'ul Mas'ud Slamet Wahyudi Sugeng Prayitno Budio Sulistyono Sulistyono Veronika K, Veronika widya wijayanti