Articles
<![CDATA[Pengaruh Pengunaan Katalis Terhadap Laju Dan Efisiensi Pembentukan Hidrogen ]]>
<![CDATA[Purnami, Purnami]]>;
<![CDATA[Wardana, ING.]]>;
<![CDATA[K, Veronika]]>
<![CDATA[ Rekayasa Mesin Vol 6, No 1 (2015) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2015.006.01.8
<![CDATA[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.]]>
<![CDATA[Studi Numerik Pengaruh Variasi Jumlah Saluran Masuk Pressure Swirl Atomizer Terhadap Karakteristik Spray ]]>
<![CDATA[Purnami, Purnami]]>
<![CDATA[ Rekayasa Mesin Vol 5, No 3 (2014) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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<![CDATA[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.]]>
<![CDATA[Pengaruh Variasi Tebal Sudu Terhadap Kinerja Kincir Air Tipe Sudu Datar ]]>
<![CDATA[Wahyudi, Slamet]]>;
<![CDATA[Cahyadi, Dhimas Nur]]>;
<![CDATA[Purnami, Purnami]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 3, No 2 (2012) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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<![CDATA[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]]>
<![CDATA[Pengaruh Variasi Sudut Static Mixer Terhadap Kinerja Heat Exchanger ]]>
<![CDATA[Widhiyanuriyawan, Denny]]>;
<![CDATA[Purnami, Purnami]]>;
<![CDATA[Ardiansyah, Ardiansyah]]>
<![CDATA[ Rekayasa Mesin Vol 2, No 2 (2011) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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<![CDATA[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]]>
<![CDATA[Pengaruh Variasi Jarak Alur Setengah Lingkaran Terhadap Penguatan Vorteng dan Penurunan Tekanan Pada Saluran Berpenampang Segi Empat ]]>
<![CDATA[Purnami, Purnami]]>
<![CDATA[ Rekayasa Mesin Vol 1, No 2 (2010) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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<![CDATA[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]]>
<![CDATA[Perbandingan Interaksi Karbon Aktif dengan Polaritas Minyak Nabati terhadap Karakteristik Pembakaran Premixed ]]>
<![CDATA[Purnami, Purnami]]>;
<![CDATA[Wardana, I Nyoman Gede]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 12, No 1 (2021) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2021.012.01.9
<![CDATA[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.]]>
<![CDATA[UPAYA MENGEMBANGKAN MINAT MENULIS SISWA MELALUI GAWAI MENUJU NEW NORMAL ]]>
<![CDATA[Purnami, Purnami]]>
<![CDATA[ Jurnal Ilmiah WUNY Vol 3, No 2 (2021): Jurnal Ilmiah WUNY ]]>
Publisher : <![CDATA[Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/jwuny.v3i2.42634
<![CDATA[Abstrak Tujuan dari penelitian ini adalah untuk mengetahui seberapa besar pengaruh gawai terhadap minat menulis siswa kelas VI, SDN Karangtengah IV menuju persiapan new normal. Dalam Penelitian ini digunakan pendekatan kualitatif deskriptif. Metode yang digunakan adalah melalui pemanfaatan gawai dalam kegiatan pembelajaran. Hasil penelitian menunjukkan bahwa dalam kegiatan menulis terutama pada saat pembelajaran dari rumah, siswa kelas VI SDN Karangtengah IV masih rendah. Namun, dalam penggunaan gawai dalam berkomunikasi sangat lancar. Hal tersebut yang mendorong untuk meneliti seberapa besar pengaruh gawai dalam menumbuhkan minat menulis siswa menuju persiapan new normal. Tahapan berupa perencanaan, pelaksanaan, dan evaluasi pembelajaran melalui pemanfaatan gawai dalam menumbuhkan minat menulis siswa. Siswa mendapatkan tugas melalui pembelajaran luring dan daring. Tugas tersebut berupa pemanfaatan video dan gambar melalui gawai yang mereka miliki, kemudian dikembangkan menjadi tugas tertulis. Kendala yang terjadi di lapangan adalah ada beberapa siswa yang tidak memiliki gawai sendiri, sehingga pengerjaan tugas menjadi tidak tepat waktu. Disamping itu, terkadang sulit mendapatkan sinyal. Efektifitas pemanfaatan gawai pada kegiatan pembelajaran adalah adanya peningkatan minat menulis pada siswa. Minat menulis tumbuh karena adanya rasa senang dengan media gawai tersebut. Dari rasa senang itulah timbul minat yang lebih terhadap tugas yang diberikan. Hasil akhir menunjukkan bahwa dengan pemanfaatan gawai dalam kegiatan pembelajaran, minat menulis di kelas VI pada SDN Karangtengah IV mengalami peningkatan.]]>
<![CDATA[THE EFFECT OF CRYSTALLIZER ROTATION ON THE GAS HYDRATE PERFORMANCES ]]>
<![CDATA[Widya Wijayanti]]>;
<![CDATA[Mega Nur Sasongko]]>;
<![CDATA[Nurkholis Hamidy]]>;
<![CDATA[Purnami Purnami]]>
<![CDATA[ Journal of Environmental Engineering and Sustainable Technology Vol 4, No 1 (2017) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jeest.2017.004.01.2
<![CDATA[The performance of hydrate was shown by the hydrate formation rate, the hydrate stability, and the storage capacity. In the study, we investigated the hydrate performance by influencing the rotation of crystallizer that predicted to increase the agitation of the hydrate performance. The hydrate represent the bond of water molecules and gas absorbed by the water molecules. In the experiment, we used the 50% propane and 50% butane as the gas absorbed. The gas was injected in a crystallizer at 3 bar pressure, then the crystallizer was rotated by 100, 200, and 300 rpm. The results shows that the best performances of hydrate when the crystallizer was rotated at 300 rpm. The crystallizer rotation speed of 300 rpm had the highest the formation rate and the decomposition rate. The highest decomposition rate indicated the highest stability. Meanwhile, the highest hydrate storage capacity was also occured at the rotation of 300 rpm as 2809 V / V.]]>
<![CDATA[Influence of Surface Roughness and Paint Coating on Corrosion Rate ]]>
<![CDATA[Dekrit H. Akbar]]>;
<![CDATA[Purnami Purnami]]>;
<![CDATA[Sugeng Prayitno Budio]]>
<![CDATA[ International Journal of Mechanical Engineering Technologies and Applications Vol 1, No 1 (2020) ]]>
Publisher : <![CDATA[Mechanical Engineering Department, Engineering Faculty, Brawijaya University ]]>
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DOI: 10.21776/mechta.2020.001.01.3
<![CDATA[The technology of paint and its application develop fast, driven by the increasing cost of energy, raw material and labors. In this study, paint was used as a corrosion inhibitor on the surface of API 5L while saltwater is used as the corrosive media. The coating was varied for three different cases, i.e. primary coating only, primary and color coating as well as primary, color and glossy coating. Meanwhile, surface roughness was varied for 0.6, 0.7 and 0.8 μm. It is concluded that surface roughness and coating influence the corrosion rate. Smoother the surface and more coating layers lower the corrosion rate. Based on the study on API 5L steel, the lowest corrosion rate was obtained at 0.6 μm with 3 paint coatings (primary, color paint and clear/gloss)]]>
<![CDATA[Karakterisasi Sudut Kontak dan Biodegradasi Pada Komposit Polylactide Acid (PLA) – Polycaprolactone (PCL) Untuk Aplikasi Biomaterial ]]>
<![CDATA[Dina Novera Serfandi]]>;
<![CDATA[Putu Hadi Setyarini]]>;
<![CDATA[Purnami Purnami]]>;
<![CDATA[Sulistyono Sulistyono]]>
<![CDATA[ Prosiding Seminar Sains Nasional dan Teknologi Vol 12, No 1 (2022): VOL 12, NO 1 (2022): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Wahid Hasyim ]]>
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DOI: 10.36499/psnst.v12i1.7243
<![CDATA[Komposit polylactide acid (PLA) dan polycaprolactone (PCL) secara ekstensif sedang dieksplorasi dalam beberapa tahun terakhir ini untuk aplikasi biomedis karena karakteristiknya yang menjanjikan, termasuk sifat biodegradabilitas. Karena memiliki sifat biokompatibilitas, biodegradibilitas, dan tidak beracun maka PLA merupakan material yang sesusai untuk implan. Polycaprolactone (PCL) adalah anggota polimer biodegradable dari keluarga poliester alifatik. Tujuan dari penelitian ini adalah untuk mengetahui hidrofobisitas permukaan spesimen material PLA murni dan komposit PLA-PCL dan untuk mengetahui kecepatan degradasi spesimen PLA murni dan komposit PLA-PCL. Metode dalam penelitian ini adalah dengan cara ekstrusi agar material tercampur secara homogen kemudian filamen hasil ekstrusi dipotong dan dimasukkan ke dalam mesin injeksi untuk pembuatan spesimen pengujian. Hasil pengujian hidrofobisitas menunjukkan bahwa spesimen dengan material PLA murni dan komposit PLA-PCL merupakan kategori hidrofilik karena sudut yang terbentuk adalah 60,30° dan 65°. Berdasarkan pengujian immerse nilai sudut kontak berbanding terbalik dengan nilai pengurangan berat selama proses pengujian. Seperti PLA murni, semakin kecil nilai sudut kontak maka semakin besar nilai pengurangan berat karena kemampuan material lebih cepat terdegradasi. Dan untuk komposit PLA-PCL mempunyai nilai sudut kontak yang lebih besar dikarenakan penambahan PCL yang mempunyai kemampuan terdegradasi lebih lama dibandingkan dengan PLA.]]>
