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All Journal Jurnal Energi Dan Manufaktur International Journal of Renewable Energy Development Rekayasa Mesin ROTOR: JURNAL ILMIAH TEKNIK MESIN International Conferences SDGs 2030 Challenges and Solutions JCES (Journal of Character Education Society) SENTIA 2016 Conference on Innovation and Application of Science and Technology (CIASTECH) ASEAN Journal of Chemical Engineering Scientific Journal of Mechanical Engineering Kinematika International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Prosiding SNPBS (Seminar Nasional Pendidikan Biologi dan Saintek)
Nurkholis Hamidi
Jurusan Teknik Mesin Fakultas Teknik Universitas Brawijaya, Jl. M.T. Haryono 167 Malang
Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Combustion Characteristics of A Wood Pellet Made of Albizia Chinensis and Rice Husk Lilis Yuliati; Nurkholis Hamidi; Rafif Ezrha Pragiwaka
International Journal of Mechanical Engineering Technologies and Applications Vol 3, No 1 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.01.8

Abstract

To reduce dependence on fossil fuel, biomass, e.g. the wood pellet, has been developed in recent years.  Indonesia has an abundant source of biomass, e.g. wood and rice husk. This work investigates the combustion characteristics of the wood pellet made of Albizia Chinensis and rice husk. The analyzed combustion properties are ignition delay time, the mass of residue, combustion duration, combustion rate, maximum flame temperature, During the experiment, the rice husk content varies between 0 to 50%. As the rice husk content increases from 0 to 50%, the ignition delay time increases from 6 to 9.9 seconds, the mass of residue increases from 21.2 to 45 % and the combustion rate decreases from 0.55 to 0.52 g/min. In addition, higher rice husk content also decreases the maximum temperature.
PENGARUH MEDAN MAGNET TERHADAP WARNA API PEMBAKARAN PREMIX MINYAK KELAPA Gatot Soebiyakto; I.N.G. Wardana I.N.G. Wardana; Nurkholis Hamidi; Lilis Yuliati
SENTIA 2016 Vol 8, No 2 (2016)
Publisher : SENTIA 2016

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Abstract

Penerapan  proses pembakaran khususnya nyala api dapat dilakukan dengan memberikan pengaruh kuat medan magnet atau elektromagnetik pada api.  Pengaruh  medan magnet diindikasikan adanya gaya tarik partikel O2 dan bahan bakar pada nyala api, sebagian O2 melepaskan diri dari homogenitas dan sebagian bahan bakar mengalami perubahan temperatur dan panas bahan bakar terserap oleh medan magnet, karena adanya droplet maka uap panas tersebut juga dipancarkan oleh medan magnet mengarah pada percikan api. Tujuan penelitian (jangka panjang) dengan mengkaji lebih dalam tentang karakteristik nyala api pembakaran akibat induksi medan magnet dengan bahan bakar minyak nabati dengan harapan mendapatkan tingkat temperatur dari pembentukan warna nyala api, mendapatkan karakteristik induksi medan magnet serta membuktikan bahwa profil api dipengaruhi induksi medan magnet yang bermuara pada metode analisis pembakaran minyak nabati secara luas. Untuk penelitian awal ini mengamati profil warna nyala api dari komposisi AFR mendekati stoichiometry dari bahan bakar minyak kelapa. Hasil penelitian menunjukkan bahwa nyala api minyak nabati dari pembakaran premix minyak kelapa mengalami penurunan tingkat luminositas warna nyala api ( menjadi pudar) bila dipengaruhi induksi medan magnet.dan luasan (zona) warna nyala api semakin melebar bila dipengaruhi medan magnet jika dibandingkan tanpa menggunakan induksi medan magnet.
KONSUMSI BAHAN BAKAR DAN ANALISIS THERMODINAMIKA PADA MOTOR BAKAR 6-LANGKAH DENGAN LANGKAH POWER EKSPANSI SAMPAI TITIK MATI BAWAH Riswan Sepriyatno; Eko Siswanto; Nurkholis Hamidi
Conference on Innovation and Application of Science and Technology (CIASTECH) CIASTECH 2020 "Peranan Strategis Teknologi Dalam Kehidupan di Era New Normal"
Publisher : Universitas Widyagama Malang

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Abstract

 Penelitian ini bertujuan mengobsevasi fuel consumption dan menganalisis termodinamika dari motor bakar 6 langkah dengan langkah power ekspansi sampai titik mati bawah. Bahan bakar yang digunakan dalam observasi ini adalah pertalite dengan nilai RON 90.Metode yang digunakan adalah metode eksperimental nyata, dengan variabel bebas yaitu bukaan throttle sebesar 35%, 40%, 45%, dan 50% dengan pembebanan pada prony disk brake sebesar 10kg, 20kg, 30kg, 40kg, 50kg. Pada bukaan throttle 50% dengan pembebanan 50 kg diperoleh hasil nilai konsumsi bahan bakar terendah sebesar 4,38 kg/jam dan efisiensi thermal pada motor bakar 6-langkah ini mengalami peningkatan sebesar 11.61% di bandingkan dengan efisiensi thermal pada motor bakar 4-langkah konvensional.
The Total Impulse Study Of Solid Propellants Combustion Containing Activated Carbon From Coconut Shell As A Catalyst Nur Rachman Supadmana Muda; I.N.G.Wardana I.N.G.Wardana; Nurkholis Hamidi; Lilis Yuliati; Aries Boedi Setiawan
International Conferences SDGs 2030 Challenges and Solutions Vol 1, No 1 (2017)
Publisher : International Conferences SDGs 2030 Challenges and Solutions

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Abstract

This study investigates the capabilities of thrust, burn time, and total impulse from solid propellant materials. Attempts to increase the three variables are quite difficult because the thrust value is inversely proportional to the value of the burn time, it requires the catalyst as a regulator of the composition to produce an optimal variable value. The activated carbon from the coconut shell is used as a catalyst on a composite solid propellant material containing ammonium perchlorate (AP), hydroxyl terminated polybutadiene (HTPB) and aluminium (Al). The effect of adding coconut shell activated carbon may affect thrust parameters, burn time and total impulse rocket. The method of measuring parameters using rocket thrust test equipment. The mass of the test sample is 250 grams, the diameter of the test chamber is 20 mm, the length of the chamber is 200 mm. After going through the combustion process, it produces a graph and thrust value, total impulse and burning time. The thrust test results show that the test propellant 3 produces the best characteristic composition of 70% AP, 15% HTPB, 10% Al, and 5% activated carbon of 400 mesh with average thrust: 148.67N, total impulse: 637, 5 Ns, burn time: 4,288 s.
Study of Thermal Behavior in Mixed Scrap Tires (ST) And Polypropylene (PP) Plastic Using Thermogravimetry Analysis (TGA) and Differential Scanning Calorimetry (DSC) Ilyas Sofana; Widya Wijayanti; Nurkholis Hamidi
International Journal of Mechanical Engineering Technologies and Applications Vol 3, No 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.7

Abstract

The world's rapid population growth, technological progress, and industrialization lead to an increase in fossil energy demand such as oil, coal, and natural gas. It is feared that this could lead to a scarcity of fossil energy in the future, therefore the use of alternative energy must be considered. One interesting concept to develop is waste to energy by utilizing plastic waste and also tires on vehicles. This is very possible because the two wastes contain elements of hydrocarbons which are also contained in fossil fuels so they can be processed to become alternative energy which can simultaneously reduce the population of the waste due to the increase in the world's population. This study aims to investigate the thermal behavior of scrap tires (ST) and polypropylene (PP) plastic using thermogravimetry analysis (TGA) and differential scanning calorimetry (DSC). TGA thermogram showed that the feedstock samples were degraded in the temperature range of 331,97 oC to 448,08 oC. The interpretation of the DSC thermogram that showing information about the glass transition point and the melting point of the feedstock polymer will also be presented in this study.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (865.588 KB) | DOI: 10.22146/ajche.49890

Abstract

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.
PENGARUH DAYA PEMANASAN MICROWAVE OVEN TERHADAP KEKUATAN TARIK KOMPOSIT SERAT DAUN NANAS BERMATRIK EPOXY Redi Bintarto; Moch. Syamsul Ma’arif; Fransisca Gayuh Utami Dewi; Sugiarto Sugiarto; Nurkholis Hamidi; Pudya Heryana
Scientific Journal of Mechanical Engineering Kinematika Vol 6 No 2 (2021): SJME Kinematika Desember 2021
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v6i2.207

Abstract

This study aims to determine the effect of microwave oven heating power on pineapple leaf fiber on the tensile strength of epoxy matrix composites. In this study, the composite reinforcement used was pineapple leaf fiber without treatment and pineapple leaf fiber heated using a microwave oven with 250W, 440W, and 715W power for 15 minutes after being given 6% NaOH immersion for 2 hours. The composite manufacturing method used is the vacuum assisted resin infusion method. Tensile testing was carried out on pineapple leaf fiber reinforced composite specimens according to ASTM D638-01 standard. The results showed that the higher the heating power of the microwave oven, the higher the tensile strength of the composite due to the better adhesion between the fiber and the epoxy matrix. The highest tensile strength was obtained in the pineapple leaf fiber-reinforced composite with a heating power of 715W of 147.9 MPa, then heating with a power of 440W of 136.6 MPa, heating with a power of 250W of 125.5 MPa, and the lowest on specimens of pineapple leaf fiber composite without treatment of 107.1 MPa. In addition, the SEM results also show that the surface roughness of the fiber increases with the addition of heating power and the wettability results also show that the wettability between the fiber and the epoxy matrix is ​​getting better as the heating power of the microwave oven increases.
Pemanfaatan sifat Wettability Minyak Nabati untuk meningkatkan Cleanability pada kasus Fouling Muhammad Akhlis Rizza; I Nyoman Gede Wardana; Nurkholis Hamidi; Widya Wijayanti
Prosiding SNPBS (Seminar Nasional Pendidikan Biologi dan Saintek) 2017: Prosiding SNPBS (Seminar Nasional Pendidikan Biologi dan Saintek)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (243.781 KB)

Abstract

Fouling menjadi permsalahan pada proses produksi di suatu industri, terutama industri yang memiliki prosesperpindahan panas. Fouling dapat mengurangi perpindahan panas yang terjadi. Oleh karena itu terjadinyafouling harus diatasi dengan cleaning yang cepat. Untuk mempercepat proses cleaning, terutama pada foulingdengan material droplet minyak nabati dapat dilakukan dengan memanfaatkan sifat wettability. Sifatwettability dapat diatur dengan mengatur temperatur pada droplet. Tujuan analisis ini adalah mengetahuifaktor-faktor yang berpengaruh pada wettability, sehingga dapat dipakai untuk memudahkan proses cleaning. Berdasarkan analisis, diperoleh kesimpulan bahwa wettability dipengaruhi oleh temperatur minyak nabatiserta kerataan permukaan substrate-nya.
CO-PYROLYSIS OF SCRAP TIRES (ST) DAN PLASTIK POLYPROPYLENE (PP): DISTRIBUSI PRODUK DAN PROPERTIS FISIK PYRO-OIL Ilyas Sofana; Widya Wijayanti; Nurkholis Hamidi
Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v13i3.952

Abstract

Plastic waste and scrap tires (ST) have now become pollution that harms the environment in various cities around the world if not managed properly. As pollutants, the two types of waste are actually very interesting to manage because they contain hydrocarbon elements so that they can be processed and have the potential to become alternative fuels. This study aims to determine the effect of co-pyrolysis of scrap tires (ST) and polypropylene (PP) plastic on the distribution of products in the form of oil and char/charcoal. The pyrolysis process was carried out at a temperature of 450℃  for 90 minutes using a fixed bed pyrolysis reactor with ST:PP mixing variations, namely 9:1, 8:2, 7:3, 6:4, and 5:5. The maximum pyrolysis product yield in the form of oil as much as 40.7 Wt% was obtained at a 6:4 mixing variation followed by a 7:3 (36.7 Wt%) mixing variation, then a 5:5 variant (36 Wt%), after that an 8:2 variant (34.3 Wt%) and the last is the 9:1 mixing variation with a total of 28.3 Wt%. For the maximum pyrolysis product in the form of char as much as 42.6 Wt% obtained at 9:1 mixing variation followed by 7:3 mixing variation (41 Wt%) after that 8:2 variant with 38.7 Wt%, then 6:4 with the amount of 27.7 Wt%, and the last is the mixing variation of 5:5 to obtain the char result of 18.3 Wt%. Physical properties of pyro-oil in the form of density and calorific value will also be shown in this study.
Co-Authors A.A. Ketut Agung Cahyawan W Akhlis Rizza, Muhammad ANGGI FIRMANSYAH Aries Boedi Setiawan Aris Kurniawan Aris Subagiyo Astrada Astrada, Astrada Baananto, Fauzan Candra Trimandoko, Candra Dadang Hermawan Dedy Nataniel Ully Denny Widhiyanuriyawan Dian Dinanti Djoko Wahyudi Eko Siswanto Farid Majedi Farid Majedi, Farid Fransisca Gayuh Utami Dewi Gatot Soebiyakto Gunawan Prayitno Habibulfalah, Endi Hadi Saroso Handono Sasmito I Nyoman Gede Wardana I.N.G. Wardana I.N.G. Wardana I.N.G. Wardana I.N.G. Wardana I.N.G.Wardana I.N.G.Wardana Ibadurrohman, Ibrahim Ahmad Ilyas Sofana Ilyas Sofana ING Wardana Kusumaningsih, Haslinda Lilis Yuliati Lilis Yuliati Lilis Yuliati Lilis Yuliati Marali, Aryati Muhaymin Mega Nur Sasongko Moch. Syamsul Ma’arif Muhamad Bula Muhammad Satya Adhitama Munawir Munawir Munawir Munawir Nindya Sari Nur Rachman Supadmana Muda Praswanto, Djoko Hari Pudya Heryana Purbo Suwandono Rafif Ezrha Pragiwaka Ray Dewi Redi Bintarto Redi Bintarto, Redi Rudianto Raharjo Rudy Soenoko Sabila, Adriazka Fasa Sepriyatno, Riswan Slamet Wahyudi Sudjito Soeparman Sugiarto Sugiarto Suluh Elman Swara Trismawati Trismawati Widodo, Teguh Dwi Widya Wijayanti widya wijayanti Widya Wijayanti Widya Wijayanti Wijayanto, Vera Dwi Wijono Wijono