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All Journal Jurnal Reviu Akuntansi dan Keuangan JURNAL ECONOMIA Jurnal Akuntansi & Auditing Indonesia Jurnal Energi Dan Manufaktur International Journal of Renewable Energy Development Jurnal Bisnis dan Manajemen Jurnal Keuangan dan Perbankan Rekayasa Mesin Jurnal Akuntansi Multiparadigma 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 The Indonesian Journal of Accounting Research Scientific Journal of Mechanical Engineering Kinematika Indonesian Journal of Electrical Engineering and Computer Science TECHNO-SOCIO EKONOMIKA International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Prosiding SNPBS (Seminar Nasional Pendidikan Biologi dan Saintek) Jurnal Akuntansi Manado (JAIM) International Journal of Renewable Energy Development
Nurkholis Hamidi
Departement Of Mechanical Engineering Brawijaya University, Malang
Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Journal : Rekayasa Mesin

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Kinerja Thermoelectric pada Kotak Pendingin Berdasarkan Rangkaian Thermoelectric dan Putaran Fan Wind Tunnel Munawir, Munawir; Sasongko, Mega Nur; Hamidi, Nurkholis
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.2021.012.01.4

Abstract

A thermoelectric cooler (TEC ) is a component of an electric solid-state cooler that works as a heat pump in the cooling process. Utilizing the peltier effect that is when an electric current is flowed heat absorption occurs on both sides of the thermoelectric and the release of heat on the other side. The use of thermoelectric as a coolant in cool box systems has been widely studied. The purpose of this study was to determine the performance of the cooler using thermoelectric based on the circuit and air velocity in the wind tunnel. The studied performance includes temperature difference, heat absorption, and coefficient of performance. The method used in this study is a real experimental method, with research variables namely series and parallel thermoelectric series and wind tunnel air velocity. Data were taken in the form of cool room temperature cold side temperature, hot side temperature, heatsink temperature, and ambient temperature. Thermoelectric connectivity electrically uses series and parallel circuits and is thermally arranged in series. The results showed that the thermoelectric circuit and wind tunnel air velocity affect the performance of the thermoelectric. Thermoelectric with series circuit produces the highest COP absorption compared to the parallel circuit. The highest performance thermoelectric series is obtained at an airspeed of 9.8 m/s. in these conditions the temperature difference (AT) produced reaches 19oC. the heat absorption (qc) reaches 34.26 watts and the COP reaches 0.89
Efek Bentonit pada Karakteristik Pembakaran Droplet Biodiesel Kelapa Sawit Wijayanto, Vera Dwi; Hamidi, Nurkholis; Wijayanti, Widya
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.2020.011.03.4

Abstract

The blends of fuel to base liquid fuels for the enhancement of combustion properties has long generated interest since it is linked to improvement in combustion properties in biodiesel fuels. This work investigates the effect of bentonite nanoparticles on the combustion characteristics of palm oil biodiesel. These nanoparticles are added in various compositions on biodiesel which are 0% (B0), 10% (B10), 20% (B20) and 30% (B30). The insulin pen was used to make Sub-millimeter-sized spherical droplets, and the combustion process of droplets was recorded using a camera in atmosphere condition. The fuel was dripped on the tip of the thermocouple junction and ignited using a torch of the butane-air mixture on a cylindrical burner. Properties such as ignition delay, burning rate, and flame temperature of droplets were measured with post-processing of the resulting images. The results showed a decrease in ignition delay and an increase of flame temperature with the increase of bentonite percentage due to bentonite acts as a catalyst capable of accelerating the reaction rate. However, the burning rate decrease with the increasing of bentonite percentage due to the oxygen content of the mixture is getting lower.
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.
Pengaruh Panjang Rantai Karbon dan Derajat Ketidakjenuhan terhadap Karakteristik Pembakaran Droplet Asam Lemak Tunggal Ibadurrohman, Ibrahim Ahmad; Hamidi, Nurkholis; Yuliati, Lilis
Jurnal Rekayasa Mesin Vol 12, No 2 (2021)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2021.012.02.11

Abstract

This study aimed to investigate the effect of the different carbon chain lengths and the degree of unsaturation of six fatty acids as the constituent of vegetable oils. The droplet combustion was carried out at an ambient temperature and atmospheric pressure. The variation in the carbon chain length and the degree of unsaturation resulted in different physical and chemical properties of the fuel, which affect the droplet combustion characteristics. The increase of the carbon chain length results in longer ignition delay times and shorter burning durations, as well as higher droplet temperatures, burning rate constant, and specific power output. Conversely, an increase in the degree of unsaturation with the presence of double bond results in shorter ignition delay and longer burning duration, as well as higher droplet temperatures, but lower burning rate constant and specific power output. The droplet diameter evolution divides the combustion period into unsteady burning zones and quasi-linear burning zones. The flame dimension of unsaturated fatty acid is higher due to the soot formation at the top of the flame. A bluish flame related to the higher oxygen content in the molecule can be observed in saturated fatty acids. The short-chain saturated fatty acid has a large non-luminous zone because they are rich in oxygen. In contrast, the long-chain saturated fatty acid has a narrow non-luminous zone with high flame radiation.
Performa pada Motor Bakar 6-Langkah dengan Langkah Power Ekspansi sampai Titik Mati Bawah Sepriyatno, Riswan; Siswanto, Eko; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol 12, No 2 (2021)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2021.012.02.18

Abstract

This study aims are to observe the performance of a six-stroke combustion motor and to analyze the thermodynamics of a six-stroke combustion engine with a power expansion step to the bottom dead center. The fuel used in this observation is pertalite with a RON 90 value. The method used is a true experimental method, with independent variables, namely 35%, 40%, 45%, and 50% throttle openings with loading on the prony disc brake of 10 kg, 20kg, 30kg, 40kg, and 50kg. In the torque data, each throttle opening shows the highest number of 7.26 (Nm) with a load of 50kg and the lowest value of 2.01 (Nm) with a load of 10kg, for effective power the highest value is 8.47 (kW) at 50% throttle opening with load is 40kg and the lowest value is 2.49 (kW) at 35% throttle opening with a load of 10kg, while for the specific fuel consumption (SFC) the highest value is 4.28 (kg/Hp.h) at 40% throttle opening with a load of 10kg and the lowest value is 0.77 (kg/Hp.h) at 50% throttle openings with a load of 50kg, and for the thermal efficiency of the six-stroke motor, which means an average increase of 14.58% compared to the thermal efficiency of the conventional 4-stroke internal combustion engine.
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.
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

Abstract

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.
MORPHOLOGY, STRUCTURE AND MECHANICAL PROPERTIES OF NATURAL CELLULOSE FIBER FROM OIL PALM FROND FIBER (ELAEIS GUINEENSIS JACQ) Sari, Martina Puspita; Purnowidodo, Anindito; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1590

Abstract

Natural fiber is one of the innovations in the development of renewable materials from composites which are considered more environmentally friendly. One of the advantages is that it is biodegradable which are able to decompose in nature and does not leave residues that are harmful to the environment until now it has been developed in combination with various types of polymer matrices so that it can produce composites that have good strength. In this study, composites made from palm frond fiber (Elaeis guineensis Jacq) were characterized by a two-step treatment, namely alkalization using sodium hydroxide (NaOH) and the addition of a bleaching process using hydrogen peroxide (H2O2). single fiber and Weibull distribution methods, chemical properties testing including chemical composition of fiber content, FTIR, and physical property testing including diameter measurement and SEM observations. Thus, the optimal concentration of alkali and bleaching was produced in the two-step process between 5% NaOH concentration and H2O2 in terms of bonding characteristics, this was mainly due to the reduction of the amorphous part of the fiber. There was a color change after the OPFF was treated with NaOH and H2O2 where the color of the OPFF became brighter. The heat resistance value is inversely proportional to the thickness value after alkaline treatment. heat resistance increased while the diameter of the OPFF decreased with increasing concentration of NaOH and the addition of the second treatment H2O2. The best crystallinity index was obtained at 10% NaOH variation and the best cellulose content was obtained at 5% NaOH variation. Likewise, the tensile strength of TF without treatment experienced a significant increase (76%) with 5% NaOH - H2O2 treatment. The results of the FTIR (Fourier-transform Infrared Spectroscopy) test confirmed that the alkaline treatment and bleaching removed the hemicellulose content, impurities, and excessive water absorption. The surface of the treated OPFF becomes rougher. The etched surface shows interlocking with the matrix as shown in the SEM images. The effect of NaOH and H2O2 treatment on OPFF shows the potential of OPFF as a reinforcement for matrix polymer composites to reduce the use of synthetic fibers.
THE EFFECT OF AIR FLOW RATE ON THE CHARACTERISTICS OF PULVERIZED CATALYTIC COMBUSTION OF RICE HUSK WASTE BIOMASS Hamidi, Nurkholis; Yuliati, Lilis; Purnami; Maulana , Syahrizal
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1856

Abstract

The purpose of this study was to determine the effect of airflow rate on the characteristics of catalytic combustion of pulverized rice husk biomass. Natural zeolite was used as the catalyst in this study. The combustion characteristics included the value of Initiation Temperature of Volatile Matter (ITVM), Initiation Temperature of Fixed Carbon (ITFC), peak of weight loss rate temperature (PT), Burning out Temperature (BT), mass reduction graph (TGA), mass reduction rate (DTG), heating value, and activation energy were measured. The sample used was 45-200 µm in size, and the percentage of catalyst was 7%. The research was carried out using 4 variations, including 2.9 ml/min, 5.8 ml/min, 9.0 ml/min, and 14.8 ml/min, each of which contains the same air composition, namely 80% nitrogen and 20% oxygen. The results showed that the greater the airflow contained in the pulverized biomass catalytic combustion process could increase the combustion characteristics including reducing the value of ITFC, PT, and BT. In addition, it also accelerates the rate of mass reduction and decreases its activation energy due to increasing pressure along with increasing temperature in the combustion chamber, besides that excess air also causes the combustion that occurs in more perfect combustion.
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

Abstract

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.
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Ghofar Akhlis Rizza, Muhammad Alamsah, Azwar Alfonsus Jantong Amanah Hijriah Ana Pratiwi ANGGI FIRMANSYAH Anindito Purnowidodo Ari Wahjudi Aries Boedi Setiawan Aris Kurniawan Aris Subagiyo Astrada Astrada, Astrada Bambang Subroto Candra Trimandoko, Candra Dadang Hermawan Dedy Nataniel Ully Denny Widhiyanuriyawan Dian Dinanti Djoko Wahyudi Djoko Wahyudi Eko Ganis Sukoharsono Eko Siswanto Endang Mardiati Erwin Saraswati Faiz, Naufal Muhammad Farid Majedi Farid Majedi, Farid Fauzan Baananto Fisal Yuliansyah Fransisca Gayuh Utami Dewi Fransiska Iing Mariandini Gatot Soebiyakto Gugus Irianto Gunawan Prayitno Habibulfalah, Endi Hadi Saroso 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 I.N.G.Wardana Ibadurrohman, Ibrahim Ahmad Ilyas Sofana ING Wardana Kusumaningsih, Haslinda Lilik Purwanti Lilis Yuliati Lilis Yuliati Made Aristia Prayudi Marali, Aryati Muhaymin Maulana , Syahrizal Mega Nur Sasongko Moch. Syamsul Ma'arif Moon, Park Jae Muhamad Bula Muhammad Satya Adhitama Munawir Munawir NadaFajar Nurmani'ah Widiarti Nindya Sari Nur Rachman Supadmana Muda Nurul Fachriyah Pragiwaka, Rafif Ezrha Praswanto, Djoko Hari Princilvanno Andreas Naukoko Pudya Heryana Purbo Suwandono Purnami Purnami Purnami Ray Dewi Redi Bintarto Redi Bintarto, Redi Roekhudin, Roekhudin Rudianto Raharjo Rudy Soenoko Rudy Soenoko Sabila, Adriazka Fasa Saputro, Nurhadi Sari, Martina Puspita Sepriyatno, Riswan Slamet Wahyudi Sofana, Ilyas Sudjito Soeparman Sugiarto Sugiarto Suluh Elman Swara Suroso, Yosephine Diajeng Janur Prasasti, As’ad Munawir, Suryaningrat, Muhammad Sutrisno T Teguh Dwi Widodo Trismawati Trismawati Widya Wijayanti widya wijayanti Widya Wijayanti Wignyanto Wignyanto Wijayanto, Vera Dwi Wijono Wijono Yenni Mangoting Yusuf Hendrawan