Purnami Purnami
Jurusan Teknik Mesin Fakultas Teknik Universitas Brawijaya

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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
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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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 Tebal Sudu Terhadap Kinerja Kincir Air Tipe Sudu Datar Wahyudi, Slamet; Cahyadi, Dhimas Nur; Purnami, Purnami
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 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 | 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.
THE EFFECT OF CRYSTALLIZER ROTATION ON THE GAS HYDRATE PERFORMANCES Wijayanti, Widya; Sasongko, Mega Nur; Hamidy, Nurkholis; Purnami, Purnami
Journal of Environmental Engineering and Sustainable Technology Vol 4, No 1 (2017)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jeest.2017.004.01.2

Abstract

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.
KAJIAN CERITA CANGKRANGGA DAN DURBUDHI DALAM TANTRI KAMANDAKA DARI PENDIDIKAN AGAMA HINDU Purnami, Purnami
Jurnal PASUPATI Vol 1, No 2 (2012): Kajian Susastra Hindu
Publisher : Sekolah Tinggi Agama Hindu Dharma Nusantara Jakarta

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Abstract

ABSTRAKCerita Tantri Kamandaka merupakan cerita rakyat yang diwariskan secara turun temurun yang didalamnya mengandung ajaran-ajaran yang terdapat dalam kitab suci Veda. Dalam cerita “matinya sang kura-kura” disebabkan oleh kesombongan dan kemarahan. Cerita ini sangat baik digunakan sebagai media untuk menyampaikan ajaran-ajaran agama Hindu kepada umatnya serta menghayati serta mengamalkan nilai-nilai yang dipakai pedoman dan tuntunan dalam kehidupan sehari-hari dalam masyarakat.Penelitian ini mencoba mengkaji nilai-nilai pendidikan yang terdapat dalam cerita Tantri Kamandaka terutama pada bagian Tjakarangga dan Durbudhi yang isinya menceritakan tentang persahabatan antara angsa dan kura-kura yang mereka bersahabat karena adanya air. Penelitian ini juga dikontekstualisasikan dengan kondisi generasi muda umat Hindu yang telah larut terhadap budaya Global sehingga nilai etika dan moral yang terdapat pada sastra lokal tidak lagi terjamah.Kata Kunci: Tantri Kamandaka, Tjakarangga dan Durbudhi, Nilai PendidikanABSTRACTKamandaka Tantri story is folklore passed down from generation to generation that it contains the teachings contained in the Vedic scriptures. In the story of "the death of the turtle" caused by vanity and anger. The story is very well used as a medium to convey the teachings of Hindu religion to the people, and to live and practice the values used in the guidance and tutelage of everyday life in the community.This study tried to assess the educational value contained in the story, especially on the Tantri Kamandaka Tjakarangga and Durbudhi that it tells the story of the friendship between the swans and turtles that their friendship because of the presence of water. The study also contextualize the conditions of the younger generation of Hindus who have indulged the global culture that values ethics and morals contained in the local literature is no longer untouchable.Keywords: Tantric Kamandaka, Tjakarangga and Durbudhi, Values Education