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THE EFFECT OF CRYSTALLIZER ROTATION ON THE GAS HYDRATE PERFORMANCES Widya Wijayanti; Mega Nur Sasongko; Nurkholis Hamidy; Purnami Purnami
Journal of Environmental Engineering and Sustainable Technology Vol 4, No 1 (2017)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Brawijaya

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.

Pengaruh Prosentase Minyak Goreng Bekas Terhadap Karakteristik Pembakaran Droplet Biodiesel Mega Nur Sasongko
FLYWHEEL : Jurnal Teknik Mesin Untirta Volume IV Nomor 2, Oktober 2018
Publisher : Universitas Sultan Ageng Tirtayasa

Minyak goreng bekas merupakan kandidat yang baik sebagai bahan bakar pengganti mesin diesel. Ketersediannya yang melimpah karena merupakan sampah yang tidak terpakai dan sifat fisiknya yang mirip dengan minyak solar menjadikan minyak goreng bekas lebih dipilih sebagai biodiesel pengganti solar dibandingkan dengan jenis minyak nabati lainnya. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh prosentase campuran minyak goreng bekas dalam bahan bakar biodiesel terhadap karakteristik pembakaran droplet biodiesel yang meliputi visualisasi api, ignition delay dan burning rate pembakaran. dalam penelitian ini, campuran minyak goreng bekas yang telah diesterifikasi divariasikan dalam 0% sampai 100%. Hasil penelitian menunjukkan bahwa pada campuran biodiesel minyak goreng bekas dibawah 50%, semakin tinggi kandungan biodiesel dalam campuran solar semakin tinggi juga temperatur maksimum pembakaran droplet Sedangkan pada kandungan biodiesel minyak goreng diatas 50% sampai 100% menunjukkan temperatur yang cenderung konstan. Selain itu kecepatan pembakaran droplet akan semakin rendah seiring dengan peningkatan kandungan minyak goreng bekas dalam biodiesel. Semakin besar kandungan minyak goreng bekas dalam biodiesel menyebabkan tinggi api droplet menjadi lebih tinggi. Kandungan air dalam biodiesel minyak goreng bekas menyebabkan terjadinya microexplotion pada pembakaran droplet campuran biodiesel minyak goreng bekas dan solar

UNJUK KERJA COOL BOX BERBASIS THERMOELEKTRIK COOLER DENGAN SINGLE DAN MULTI-STAGE TERMOELEKTRIK Munawir Munawir; Mega Nur Sasongko; Nurkholis Hamidi
ROTOR Vol 12 No 2 (2019)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Thermoelectric technology works by converting thermal energy into electricity directly or preferably. Thermoelectric technology works by converting thermal energy into electricity directly or preferably. Theuse of thermoelectric as a cooler in cool box systems has been extensively studied. The thermoelectric cool ability can be achieved depending on the design of a good system. Therefore, this study aims to determine the performance of thermoelectric cooler cool box based on single and multi stage. Tests carried out using cool boxes of dimensions of 31 cm x 19 cm x 24 cm witha thickness of 3 cm and with the TEC1 12706 module. The voltage used in each configuration is 12 Volts. Temperature data readings on laptops using DAQNavi_SDK data logger connected to type K thermocouples. The result showed the multi stage configuration reached a room temperature of around 19.3 oC and 21.8 oC for single stage. Meanwhile, the multi stage configuration COP value is 1.36 and with a single stage configuration is0.88. It can be concluded that the thermoelectric configuration has an influence on the performance of the cool box system. Keywords: Cool box, Thermoelectric module, Multi stage, single stage, COP

Natural Surfactant from Fatty Acid of Morinda citrifolia L. for Deinking Flotation Trismawati Trismawati; I.N.G. Wardana; Nurkholis Hamidi; Mega Nur Sasongko
ASEAN Journal of Chemical Engineering Vol 16, No 2 (2016)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Natural surfactant is developed as fatty acid derivate from natural resources such as palm oil, sunflower oil, and safflower oil. In South East Asia countries, the palm oil is used as the main resources of fatty acid derivate. Seed oil of Morinda citrifolia L. contains unsaturated fatty acid. It is extracted and concentrated. The concentrated fatty acid of Morinda citrifolia L. (CFAMC) is used as deinking surfactant. The CFAMC is analyzed by GCMS for its constituent and its deinking flotation performance is evaluated for yield, brightness, and ERIC of deinked pulp. Based on the old newspaper (ONP) pulp with brightness of 35.84 °ISO, and ERIC of 1982.4 ppm, the deinking flotation performance of CFAMC is approaching the natural surfactant. The brightness increase is 11.36% and 16.35%, and the ERIC reduction is 37.40% and 47.73% for CFAMC and natural surfactant respectively. SEM analysis is provided to see the residual Nanoink particles on the fibers.

ANALISIS KARAKTERISTIK SUDUT PENYEMPROTAN BIODIESEL PALM OIL MELALUI PENAMBAHAN VARIASI KONSENTRASI METANOL Suryaningrat, Muhammad; Sasongko, Mega Nur; Hamidi, Nurkholis; Saputro, Nurhadi
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1211

This study aims to determine the effect of adding methanol as an additive to biodiesel to the spray angle on the diesel fuel injector. The material used in this study was palm oil biodiesel and added methanol with a concentration variation of 5%; 10%; 15%; 20% and 25% of the volume of the mixture (500 mL). The first step is mixing methanol and biodiesel according to the variables (B100; B100M5; B100M10; B100M15; B100M20 and B100M25). Next, the mixture is injected into the simulation of the combustion chamber through the injector nozzle, then the fuel that enters the simulation of the combustion chamber is recorded with a high-speed camera so that an image of the spray angle is obtained. Based on the method that has been carried out, it is found that the addition of variations in the concentration of methanol has an effect on the fuel spray angle. The higher the concentration of methanol added to biodiesel, the greater the spray angle of the fuel mixture. Spray angle for B100; B100M5; B100M10; B100M15; B100M20 and B100M25 are 7.5018o; 10.4018o; 11.8462o; 13.6052o; 14.0148o; and 14.6206o, approximately. This is because with the addition of methanol with higher levels, the mass of oxygen gas will be even greater. The greater the mass of oxygen in the fuel, the easier it is for the fuel to burn.

PENINGKATAN PRODUKSI BAHAN BAKAR HIDROGEN DENGAN BANTUAN NATURAL SURFACTANT PADA PROSES WATER SPLIT Purnami, Purnami; Dewi, Fransisca Gayuh Utami; Wardana, ING; Sasongko, Mega Nur; Yusuf, M Umar; Nugroho, Willy Satrio
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1413

Hydrogen is an alternative fuel due to its environmental friendliness and abundance. Hydrogen can be produced through water-splitting technique, in which the Oxygen (O2) and Hydrogen (H2) are separated. Water electrolysis is one of many causes of water-splitting that effectively results H2 with high purity. One drawback of electrolysis is the low efficiency. In this study, a rice straw natural surfactant was utilized to improve the efficiency. Rice straw with the volume of 5 ml, 10 ml, dan 15 ml were added to the electrolyte solution. This study shows the rice straw based natural surfactant contains hydrophilic and hydrophobic sides. Both sides capable to reduce the surface tension of the solution which destabilizes water molecules. The aromatic magnetic field of rice straw surfactant homogenizes the water net dipole moment due to the diamagnetism of water. These contributes towards the weakened hydrogen bond of the water in the solution. The synergy between hydrophobic and hydrophilic sides is potent to alter hydrogen production rate through intrinsic magnetism.

PENGARUH PENGGUNAAN MINYAK JAGUNG UNTUK CUTTING FLUID PADA PROSES FACE MILLING TERHADAP KEKASARAN PERMUKAAN PERMUKAAN DAN LAJU KOROSI BAJA KARBON Widodo, Teguh Dwi; Suwarso, Wahyu Handoyo; Wahyudiono, Arif; Raharjo, Rudianto; Bintarto, Redi; Sasongko, Mega Nur; Darmadi, Djarot Bangun; Setiawan, Yustiza Rahadian
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1627

The corrosive coastal environment will result in a high corrosion rate for any equipment installed there. This is due to the constant exposure to saltwater, high humidity levels, and strong winds. Therefore, it is crucial to use corrosion-resistant materials and regularly maintain the equipment to ensure its longevity in such an environment. One method to reduce the rate of corrosion is to pay close attention to the manufacturing parameters of these components, one of which is the face milling process. The aim of this study is investigating the effect of face milling process with different dept of cut using minimum quantity lubrication method with corn oil as a renewable vegetable cutting fluid. In this study AISI 316L stainless steel was face milled using HAAS VF-2 CNC machine. The depth of cut is varied between 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, and 0.6 mm. The results demonstrated that the greater the depth of cut, the greater the surface roughness value that will be generated. It is resulting in increment in the corrosion rate value.

PYROLYSIS OF CORN COB BIOMASS TOWARD GASEOUS PRODUCTS ON SMALL CAPACITY REACTOR Yuliansyah, Fisal; Hamidi, Nurkholis; Sasongko, Mega Nur
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 1 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.01.9

Corn waste is the result of agricultural production that can be further utilized and get additional economic for the community. Waste Corn cab is one of Indonesia abundant biomass apart from. The utilization of biomass by implementing pyrolysis process can be viable solution. This study aims to observe the determination corn cab pyrolysis using HCL-bentonite activation and without bentonite towards syngas product (CH4-H2-CO-CO2). Updraft reactor was utilized for 30 minutes pyrolysis process. We used MQ4, MQ8, MQ7 coupled with Arduino UNO for measuring CH4, H2, CO2 and CO in ppm unit. Compared without bentonite, the result showed that methane (CH4) gas production increased. In addition, we found also that hydrogen (H2) gas increased respectively. Not mention, the content of CO increased.

EFFECT OF VARIABLE HELIX ANGLE OF END MILLING TOOL ON VIBRATION AND SURFACE ROUGHNESS OF SS-AISI 304 Sonief, Achmad As’ad; Sasongko, Mega Nur; Widhiyanuriyawan, Denny Widhiyanuriyawan; Pratikto, Pratikto
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.12

Vibration in milling processes adversely affects product quality, machining precision, tool lifespan, and operating costs. A common vibration type, chatter, arises from self-excitation influenced by cutting parameters. Chatter can be classified into regenerative and resonant types. To mitigate resonance, cutting tools with variable helix angles are employed, as their varying pitch angles generate distinct tooth-passing frequencies for each blade. This study investigates the impact of helix angles on cutting parameters during end milling and their effects on vibration amplitude and surface roughness of AISI 304 stainless steel. Experimental end milling trials were conducted with different helix angle tools and cutting parameter variations. The findings reveal that optimizing the helix angle significantly reduces vibration amplitude and enhances surface finish. Controlling helix angle proves crucial for achieving superior surface quality and stable operation in end milling processes of stainless steel materials.

EFFECT OF VARIABLE HELIX ANGLE OF END MILLING TOOL ON VIBRATION AND SURFACE ROUGHNESS OF SS-AISI 304 Sonief, Achmad As’ad; Sasongko, Mega Nur; Widhiyanuriyawan, Denny Widhiyanuriyawan; Pratikto, Pratikto
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.12

Vibration in milling processes adversely affects product quality, machining precision, tool lifespan, and operating costs. A common vibration type, chatter, arises from self-excitation influenced by cutting parameters. Chatter can be classified into regenerative and resonant types. To mitigate resonance, cutting tools with variable helix angles are employed, as their varying pitch angles generate distinct tooth-passing frequencies for each blade. This study investigates the impact of helix angles on cutting parameters during end milling and their effects on vibration amplitude and surface roughness of AISI 304 stainless steel. Experimental end milling trials were conducted with different helix angle tools and cutting parameter variations. The findings reveal that optimizing the helix angle significantly reduces vibration amplitude and enhances surface finish. Controlling helix angle proves crucial for achieving superior surface quality and stable operation in end milling processes of stainless steel materials.

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