Azamataufiq Budiprasojo
Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya

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Pengaruh Variasi Sudut Water Injector Berbentuk Diffuser Terhadap Fenomena Flooding Pada Aliran Dua Fase Cair – Udara Vertikal Berlawanan Arah Budiprasojo, Azamataufiq; Soenoko, Rudy; Wahyudi, Slamet
Jurnal Rekayasa Mesin Vol 4, No 3 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (351.509 KB)

Abstract

Flooding phenomenon becomes a looses in countercurrent two-phase flow of air-liquid in vertical pipe. Water injector sattached in to the pipe prevents the looses occur. With the use of water injector, liquid will flow attached to the inside wall of the pipe, so the air will flow freely in the middle of the pipe. New design of water injectors in diffuser shape, will be studied to replace the old annular water injectors. 10 o , 15 o , and 20 o of water injector angle will be varied to find which ones can make slowing down flooding. This Research will seek water injectors with the most slowing down flooding, indicating by it superficial velocity, fluid flow, and flow patterns. Abetter Water injector is in whis have ability to handle higher flow rate and higher superficial velocity. The best water injectors in a row is a water injector with 10 o , 20 of angle.Keywords : two phase, counter current flow, flooding, water injector, flow pattern.
Engine Combustion Efficiency and Performance of Exhaust Pipe Fuel Preheating System Budiprasojo, Azamataufiq; Irawan, Andik
Jurnal Rekayasa Mesin Vol 9, No 1 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (446.321 KB) | DOI: 10.21776/ub.jrm.2018.009.01.1

Abstract

The Exhaust Pipe Preheated Fuel System (EP2FS) is a fuel preheating system that utilizes wasted heat from the muffler. Fuel heating aims to improve the homogeneity of fuel and air mixtures to improve the combustion process in the engine. Making EP2FS requires careful design and calculation because the fuel temperature should not exceed 60oC so as not to evaporate. Design and calculation, using heat transfer theory of helical heat exchanger. A ready-made system will be applied in motor vehicles to be tested for combustion efficiency and performance.
Kekuatan Mekanis Antibacterial Resin Campuran Titanium Dioksida Budiprasojo, Azamataufiq; Erawantini, Feby
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.2021.012.01.24

Abstract

The aim of this research is to analyze the effect of Titanium Dioxide (TiO2) nanoparticles as resin concentrate on mechanical strength. The tested mechanical strength is Bending strength, Impact Strength, and Microhardenest Strength. The types of resin used in this study were acrylic resin without conventional modification and acrylic resin with an additional 0.01 gr and 0.06 gr of TiO2. Specimen dimensions are made revered to ISO 20795-1 (2008) standard specifications. Mechanical strength was determined by using the universal testing machine, Izod pendulum impact testing machine, and also Vickers microhardness tester. From the analysis, the researcher found that the bending strength of resin acrylic was greatly decreased by increasing the TiO2 concentration. It happens in both TiO2 0.01gr and 0.06gr of acrylic resin compared to the non TiO2 resin. The impact strength of 0.01gr TiO2 acrylic resin was significantly increased compared to non TiO2 acrylic resin. But on the other hand for 0.06gr acrylic resin, impact strength was decreased and recorded the lowest impact strength. The highest Micro hardness strength was found in 0.06gr TiO2, It is significantly increased compared to 0.01gr TiO2 and 0gr TiO2. The general conclusion is, adding 0.01gr TiO2 nanoparticles as concentrated into acrylic resin can significantly increase the bending strength, bending strength, and microhardness strength. Meanwhile, adding 0.06gr Tio2 nanoparticles as concentrated into acrylic resin can only increase the bending strength and the microhardness strength, but not for its impact strength.
Bactericidal Activity of Resin-Titanium Dioxide and Ultraviolet in Killing Escherichia Coli Bacteria Budiprasojo, Azamataufiq; Erawantini, Feby
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 19, No 1 (2021): July 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v19i1.30329

Abstract

Escherichia coli (E.Coli) harms the environment in human digestion. E coli causes diarrhoea if one consumes food or drink that is not clean or exposed to bacteria. This research aims to produce a specimen that combines resin coated with TiO2 and partly ultraviolet light to kill Escherichia coli bacteria. The method used in this research is experimental. The activity in this research is mixing TiO2 nanomaterial with resin, then varying the time and exposure to ultraviolet radiation. Furthermore, observations were made by comparing the number of bacteria found in the two specimens with SEM. Specimens were analyzed using digital image processing. The appearance of the white capsule is the bacteria. The grey bottom is the specimen conclusion in this study was that the TiO2 (titanium dioxide) and resin specimens and modified ultraviolet radiation were quite effective in killing E.coli which achieved a 91% reduction in the number of bacteria.