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Kusumaningsih, Haslinda
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Mechanical Engineering

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Pola Aliran Dua Fase Gas - Fluida Non Newtonian Melalui Belokan Pipa Kusumaningsih, Haslinda; Hamidi, Nurkholis; Sabila, Adriazka Fasa
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.2019.010.03.12

Abstract

Two-phase flow applications can be used in chemical reactors, fuel cell and a cooler of electronic devices. Nowadays, the study on multiphase flow is concern with the gas-non Newtonian liquids flow. Since, non-Newtonian liquids commonly used in both industrial and medical applications such as blood flow, polymer and chemical solutions. The viscosity of a non-Newtonian liquid cannot be described by Newton?s law viscosity. The viscosity will affect flow behavior in pipes depends on the rheology of the fluid. The purpose of this study is to further investigate the flow pattern characteristic of gas-Newtonian/non-Newtonian liquid two-phase flows in a normal channel. Ultrapure water, polyacrylamide aqueous solutions (PAM) were used as test fluids, while argon gas as the test gas. Liquid and gas were introduced in T-junction, which placed on the upstream of the test section. In this study, the polyacrylamide concentration was variated on 0.1% wt and 0.4% wt. Moreover, the flow rate of liquids tested were variated on 0.1167 m3/s, 0.183 m3/s, 0.25 m3/s; and 0.283 m3/s. Therefore, the gas tested was variated on 0.083 m3/s, 0.167 m3/s, and 0.25 m3/s. The circular channel and bend pipe were used in this study, which has hydraulic diameter of 25.4 mm. The high-speed video camera was used to record the flow patterns in the bend as the test section. The flow pattern, bubble length, bubble velocity and void fraction were determined by analyzing the video image of the flows. Slug and plug flow patterns mostly appear in this study for each variation of liquids tested. Increasing gas superficial velocity induced the longer bubble. Furthermore, because of the higher viscosity of the non-Newtonian liquid,  the bubble nose of gas-non Newtonian liquid two-phase flow becomes sharper than the bubble nose of gas-Newtonian liquid two-phase flow. 
Pengaruh Tegangan dan Waktu pada Proses Elektropolishing terhadap Surface Roghness Material Stainless Steel AISI 316L Widodo, Teguh Dwi; Raharjo, Rudianto; Kusumaningsih, Haslinda; Bintarto, Redi; Siswoyo, Redi Cipto; Sasongko, Mega Nur
Jurnal 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.2019.010.03.11

Abstract

The purpose of this work is to reveal the surface roughness and topography of AISI 316L stainless steel due to electropolishing processes. In this paper, AISI 316L was electropolished in various times of immersion and various voltage of the processes. The mechanism of electropolishing is eroding the surface of the substrate by controlling the electron excitation process. The electropolishing processes were carried out at 4, 5, and 6 minutes also in three different voltage 4, 6, and 8 volts. The results show that the surface roughness decrease as the treatment time and also as an increase in voltage.
Pengaruh Variasi Temperatur Reaktor terhadap Hasil Produk Pirolisis Eceng Gondok Secara Ex-Situ dengan Katalis Bentonit dan Penambahan Uap Air Hamidi, Nurkholis; Firmansyah, Anggi; Kusumaningsih, Haslinda
Jurnal Rekayasa Mesin Vol 11, No 3 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.03.23

Abstract

The water hyacinth has high growth rates that can lead to various environmental problems and the production of large amounts of waste biomass. However, it can be a source of lignocellulosic biomass for the production of bio-oil.  This study aims to determine the effect of temperature variation on the pyrolysis process of water hyacinth ex-situ with bentonite catalyst and the addition of water vapor. Temperature variations used are 450°C, 550°C, and 650°C. The pyrolysis process uses 300 grams of water hyacinth and is carried out for 1 hour. The results showed that increasing pyrolysis temperature reduced the char and bio-oil products, but increased the product of gas. Pyrolysis at 450°C produces a lot of bio-oil, while at the temperature of 650°C tends to produce gas products. Also, increasing the pyrolisis temperature results in a higher density of bio-oil. Gas chromatograph testing was carried out to determine the content of organic compounds found in bio-oil. Hydrocarbons are obtained which increase with increasing temperature. The highest percentage of the content of organic compounds is in oxygen compounds. Components of alcohol, phenols, ketones, aldehydes are functional compounds found in the content of bio-oil. Acid compounds are also contained in bio-oil from the results of pyrolysis of water hyacinth.
Co-Authors ANGGI FIRMANSYAH Mega Nur Sasongko Nurkholis Hamidi Redi Bintarto, Redi Rudianto Raharjo Sabila, Adriazka Fasa Siswoyo, Redi Cipto Widodo, Teguh Dwi