Article Per Year (5 Year)
p-Index From 2021 - 2026
2.794
P-Index
This Author published in this journals
All Journal Jurnal Teknoin Rotasi Simetris Jurnal Simetris Rekayasa Mesin E-Dimas: Jurnal Pengabdian kepada Masyarakat JURNAL CRANKSHAFT ASEAN Journal of Chemical Engineering JOURNAL OF INFORMATION SYSTEM MANAGEMENT (JOISM) BERNAS: Jurnal Pengabdian Kepada Masyarakat Mechanical Engineering for Society and Industry Industrial Research Workshop and National Seminar Dharmakayana: Journal of scientists, engineers, educators and scientific activists related to society development
Drajat Indah Mawarni
Sekolah Tinggi Teknologi Ronggolawe Cepu
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Neuroscience Nursing Public Health Social Sciences Transportation Veterinary Other

Published : 29 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 29 Documents
Search

 1   2   3 
KAJI EKSPERIMENTAL PENGARUH PUTARAN PENGADUKAN TERHADAP KUALITAS BIODIESEL YANG DIHASILKAN DARI MINYAK JELANTAH drajat indah mawarni
SIMETRIS Vol 15 No 2 (2021): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v15i2.192

Abstract

Biodiesel is diesel engine fuel in the form of triglyceride compounds derived from biological resources in the form of vegetable fat oils and animal fats. Making this biodiesel using used cooking oil from food frying with KOH base catalyst and variations of stirring rotation 200, 300, 400 rpm. The transesterification reaction was initiated by heating used cooking oil with methanol and KOH catalyst at a temperature of 55C and various stirring cycles were carried out. The test was carried out at the Laboratory of Heat and Mass Transfer, Gajah Mada University, Yogyakarta. The purpose of this research is to make diesel engine fuel, to get the best stirring cycle used in the manufacture of biodiesel and to determine the quality of biodiesel, including Density Value, Viscosity, Calorific Value, Pour Point, Flash Point, Fog Point. Based on the tests carried out, it can be concluded that the best stirring rotation at 400 rpm is getting a Density Value of 891.9 kg/m3, a viscosity value of 5.2 cSt, and a 200 rpm getting the best Calorific Value 15.505 Btu/lb, a Pour Point Value of 12.33oC, a Cloud Point Value of 5.5 C and Flash Point Value 168.6oC
Peningkatan Efisiensi Produksi Pada Industri Rumah Tangga Pembuatan Wingko Drajat Indah Mawarni; Hendri Suryanto; Sarip Sarip
E-Dimas: Jurnal Pengabdian kepada Masyarakat Vol 9, No 1 (2018): E-DIMAS
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/e-dimas.v9i1.2258

Abstract

Usaha pembuatan wingko merupakan sumber penghasilan utama bagi para pengrajin wingko di Kelurahan Balun Kecamatan Cepu. Kondisi oven yang layak, bersih dan efisien akan berpengaruh pada kualitas wingko yang dihasilkan dan pendapatan pengrajin. Permasalahan yang dihadapi mitra adalah bahwa oven gas yang digunakan sudah tidak layak dan efisien lagi digunakan. Di samping itu kualitas wingkonya juga tidak bagus karena banyak yang gosong dan kurang higienis. Tujuan dari kegiatan IbM ini adalah mengatasi permasalahan mitra agar biaya produksinya rendah dan wingko yang dihasilkan juga baik kualitasnya dan higienis. Untuk itu ditawarkan solusi yaitu dibuat oven yang lebih efisien dalam penggunaan energi dan higienis serta dibuat rak penyimpanan sehingga wingko yang dihasilkan memenuhi syarat Cara Produksi Pangan yang Baik untuk Industri Rumah Tangga dari Badan Pengawas Obat dan Makanan (BPOM). Metode pelaksanaan solusi yang ditawarkan adalah pertama, koordinasi dengan mitra untuk menentukan jadwal kegiatan. Kedua, melaksanakan pembuatan oven dan pelatihan-pelatihan. Ketiga, melakukan evaluasi terhadap program pengabdian yang telah dilakukan dengan cara survey lapangan ke mitra, 1 bulan dan 6 bulan setelah program ini selesai. Hasil dari kegiatan IbM ini adalah mitra bisa menurunkan biaya produksi pembuatan wingko sebesar Rp 540.000 dalam satu bulan. Kuantitas produksi wingko meningkat dari 4,6 kg menjadi 8 kg dalam satu kali proses pemanggangan dan kualitas wingkonya bagus, tidak gosong dan higienis. Pemahaman dan keterampilan mitra meningkat dalam memproduksi wingko yang higienis sesuai persyaratan BPOM, mengganti tabung LPG yang habis dengan waktu lebih cepat dan merawat oven gas. Omzet mitra juga meningkat sebesar 15 kg dalam satu bulan.
PENGARUH JARAK NOSEL UDARA DENGAN OUTLET TERHADAP DIS-TRIBUSI UKURAN BUBBLE YANG DIHASILKAN OLEH MBG TIPE SWIRL Drajat Indah Mawarni; Indarto Indarto; Deendarlianto Deendarlianto; Wiratni Budhijanto
Jurnal Rekayasa Mesin Vol. 13 No. 2 (2022)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v13i2.977

Abstract

This research uses a swirl type MBG (MBG) with the gap variation between the air nozzle and the outlet of 1, 5 and10 mm. In this experiment, we used a tangential inlet of 25 mm and an outlet of 20 mm with a water flow rate of 20 – 70 l/min and an air flow rate range of 0.1 – 0.8 l/min, to determine the characteristics of MBG which include bubble distribution, pressure drop, hydraulic power, and efficiency. The probability of the diameter of the microbubble formed was in the range of 90 – 150 µm for all variations of the air nozzle gap. The larger the incoming water flow rate, the smaller the diameter of the bubbles formed, whereas if the water flow rate decreases, the diameter of the bubbles formed will increase. In contrast to the water flow rate, if the air flow rate increases, the diameter of the bubbles formed will increase, whereas if it decreases, the diameter of the bubbles will decrease. From the signal processing data, information was obtained about the comparison of the pressure drop of the three variations of the air nozzle gap, as follows: The higher the water flow rate, the pressure drop and hydraulic values increase significantly, while for air flow rate, the higher the air flow rate, the pressure drop and hydraulic power values will increase albeit not significantly. As for MBG efficiency, it will decrease significantly with increasing water flow rate and will increase insignificantly with decreasing water flow rate.
Kaji Eksperimental Variasi Bentuk Injektor Udara Terhadap Pola Aliran Dan Debit Air pada Air-Lift Pump Drajat Indah Mawarni
SIMETRIS Vol 16 No 2 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i2.262

Abstract

Two-phase flow is two different fluid streams flowing in a pipe. Two-phase flows precipitate into gas-liquid, gas-solid, solid-liquid flows. Apart from the flowing fluid, two-phase flow is differentiated according to the direction of the vertical pipe and the direction of the horizontal pipe. The purpose of this study was to determine the pattern of flow and discharge in the air-lift pump through variations in the shape of the injector. This test was carried out with variations in the shape of the injector, namely the type of nozzle, tube and diffuser, using a test pipe with a vertical direction and a length of 500 mm with a diameter of 24 mm, using a water level of 450 mm with a superficial gas velocity of 0.07 m/s, 0.085 m/s , 0.10m/s. Of the injectors that have been carefully inspected, the nozzle-type injector with a superficial gas of 0.10 m/s produces the highest water discharge. While the lowest water discharge is found in the type of diffuser injector with superficial gas of 0.075 m/s. In observing the flow pattern of the injector nozzle the flow that occurs is (churn flow) but in each flow pattern there are several bubbles that appear. The flow patterns of tube injectors The flow patterns that occur are churn flow and annular flow. And in the diffuser injector, the flow pattern that occurs varies, namely churn flow and slug flow, the greater the superficial gas, the flow pattern changes to annular flow.
METODE DIGITAL IMAGE PROCESSING UNTUK MENENTUKAN DISTRIBUSI UKURAN DIAMETER GELEMBUNG UDARA PADA MICROGELEMBUNG GENERATOR Drajat Indah Mawarni; Indarto Indarto; Deendarlianto Deendarlianto; Kumara Ari Yuana
Journal of Information System Management (JOISM) Vol. 4 No. 2 (2023): Januari
Publisher : Universitas Amikom Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24076/joism.2023v4i2.977

Abstract

Penelitian ini dilakukan untuk mengetahui distribusi ukuran diameter gelembung yang dihasilkan oleh alat pembangkit gelembung udara mikro (microgelembung generator/MBG). Gelembung yang dihasilkan direkam dengan menggunakan kamera berkecepatan tinggi (high speed camera). Metode yang digunakan untuk mengetahui ukuran gelembung yang dihasilkan adalah dengan menggunakan metode digital image processing (MDIP). MDIP ini memiliki keunggulan yaitu dapat mengukur dimensi distribusi gelembung pada aliran yang tidak teratur secara akurat serta pada operasinya tidak mempengaruhi aliran yang terbentuk. Hasil akhir dari ekstraksi data image processing ini adalah distribusi diameter microgelembung yang dinyatakan dalam Probability Distribution Function (PDF) dan digunakan untuk mempresentasikan perbandingan disribusi dimensi gelembung udara yang dihasilkan oleh MBG Kata Kunci: Gelembung Udara Mikro, Digital Image Processing, Highspeed Camera, Probability Distribution Function
Rancang Bangun Mesin Pencacah Rumput Bagi Peternak Sapi Di Kecamatan Jiken Kabupaten Blora Korawan Agus; Sarjono Sarjono; Ali Achmadi; Ratna Dwi Rahayu; M. Slamet Riyadi; Mudjijanto Mudjijanto; Bambang Supranoto; Drajat Indah Mawarni; Muksan Junaidi; Rosadila Febritasari
BERNAS: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 2 (2023)
Publisher : Universitas Majalengka

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (371.746 KB) | DOI: 10.31949/jb.v4i2.4888

Abstract

Mesin pencacah rumput adalah mesin yang digunakan untuk memotong-motong rumput menjadi kecil-kecil, rumput yang di cacah biasanya adalah rumput berbatang besar dan panjang.  Pembuatan mesin diawali dengan gambar desain, terdiri dari kerangka, saringan, mesin penggerak, transmisi sabuk-V, bantalan, poros, pisau pencacah, dan tutup. Proses pembuatan dilakukan per bagian, dilanjutkan dengan proses perakitan menjadi mesin, proses selanjutnya adalah uji coba dan penyempurnaan. Serah terima dilakukan di lokasi mitra, yaitu peternak sapi, hasilnya sudah memenuhi seperti yang diinginkan.
Statistical Characterization of Bubble Breakup Flow Structures in Swirl-Type Bubble Generator Systems Drajat Indah Mawarni; Wibawa Endra Juwana; IGNB Catrawedarma; Kumara Ari Yuana; Wiratni Budhijanto; Deendarlianto Deendarlianto; Indarto Indarto
ASEAN Journal of Chemical Engineering Vol 23, No 1 (2023)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ajche.78558

Abstract

The bubble breakup pattern on a swirl-type bubble generator (MBG) with water and air fluids was experimentally studied. The bubble breakup pattern was analyzed visually and characterized using several parameters such as Pressure Drop (∆P), Kolmogorov Entropy, Standard Deviation, and DWT (Discrete Wavelet Transform), which were taken from the extraction of pressure signals at the water inlet and outlet of the bubble generator. The wavelet spectrum of the measured signal was shown to identify the overall bubble breakup pattern, and the wavelet variance vector is proposed as a character vector to identify the bubble breakup pattern. The results show that there were three types of different flow breakup patterns: (1) static breakup, (2) dynamic breakup, and (3) tensile breakup. The observed bubble breakup sub-patterns can be categorized into tensile, moderate tensile, high tensile, dynamic, low dynamic, static, and high static sub-patterns. The static clustered breakup pattern has the highest wavelet energy compared to the tensile and dynamic clustered breakup.
Review on swirl-type microbubble generator: Concept, technology, and applications Drajat Indah Mawarni; Hartono Guntur Ristiyanto; Deendarlianto Deendarlianto; Wiratni Budhijanto; Mai Salem; Hakeem Niyas; Indarto Indarto
Mechanical Engineering for Society and Industry Vol 3 No 3 (2023): Special Issue on Technology Update 2023
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.10565

Abstract

The Microbubble Generator (MBG) is an aeration technology capable of producing micron-sized bubbles. Several researchers have conducted previous studies and developed various types related to the microbubble generator. The swirl-type microbubble generator has demonstrated advantages over other types. It has been widely explored recently due to its simple structure, efficiency in producing micron-sized bubbles, and potential applications across various fields. Therefore, this article reviews recent developments in swirl-type bubble generator research, encompassing the definition of microbubbles, methods for generating microbubbles through experimental and numerical approaches, the performance of microbubble generators, and their applications. Based on optimized geometric parameters combined with appropriate flow conditions, the swirl-type bubble generator is predicted to produce bubbles with controlled sizes and concentrations that meet specific requirements. However, further studies are needed to delineate the fluid-gas interactions comprehensively.
Karakterisasi Bubble yang Dihasilkan Microbubble Generator Tipe Aliran Swirl dengan Metode Image Processing Batubara, Yongki; Mawarni, Drajat Indah; Indarto; Deendarlianto
Prosiding Industrial Research Workshop and National Seminar Vol. 13 No. 01 (2022): Vol 13 (2022): Prosiding 13th Industrial Research Workshop and National Semin
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (897.945 KB) | DOI: 10.35313/irwns.v13i01.4182

Abstract

Microbubble Generator (MBG) merupakan sebuah alat yang mampu menghasilkan gelembung-gelembung berukuran mikro telah menjadi terobosan terkini dalam bidang aerasi karena memiliki banyak kelebihan dibandingkan dengan alat aerasi konvensional. Pada penelitian ini dikembangkan microbubble generator tipe aliran swirl dengan diameter outlet 30 mm, diameter nozzle gas 1,2 mm, dan jarak nozzle gas ke outlet sebesar 5 mm. Penelitian dilakukan untuk mengetahui karakteristik distribusi bubble dan performa microbubble generator dengan memvariasikan debit udara (QG) dan debit air (QL). Untuk mengetahui distribusi bubble digunakan high-speed camera melalui pengambilan gambar bubble yang diolah menggunakan teknik image processing. Digunakan pressure transducer untuk merekam tekanan yang terjadi pada inlet dan outlet MBG untuk mengetahui performa MBG melalui parameter hydraulic power (Lw) dan efisiensi hidrolis (ηh). Hasil penelitian menunjukkan dari analisis probability density function (PDF), ukuran bubble yang diperoleh berada pada rentang 100-200 μm. Nilai hydraulic power dan efisiensi hidrolis secara signifikan dipengaruhi oleh variasi debit air (QL) dibandingkan dengan variasi debit udara (QG). Dari hasil analisis wavelet teridentifikasi bahwa terjadi breakup dan coalescene bubble di setiap aliran air dan udara. Hasil dari penelitian diharapkan menjadi bahan pertimbangan dalam memilih dan merancang microbubble generator tipe aliran swirl.
KAJIAN EKSPERIMENTAL PENGARUH PARAMETER OPERASI TERHADAP PEMECAHAN GELEMBUNG DAN KINERJA PEMBANGKIT GELEMBUNG MIKRO TIPE SWIRL Mawarni, Drajat Indah; Budhijanto , Wiratni Budhijanto; Deendarlianto , Deendarlianto; Ristiyanto , Hartono Guntur Ristiyanto; Marahendra , Wawan Dedi Marahendra; Indarto , Indarto
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1611

Abstract

In this study, we present the bubble breaking mechanism of the rotating flow in the swirl type microbubble generator (MBG) on the resulting performance in this case the oxygen dissolution rate. This type of MBG is an aeration technology and has been developed in recent years by utilizing the turbulence of liquid fluid flow to produce micron-sized bubbles. The pressure difference created by changing the cross-sectional diameter causes air to be sucked in automatically in the mixing channel and forms a bubble channel before finally bursting to form micron-sized bubbles at the MBG outlet. The experiment was carried out in a transparent container measuring 2.8 m x 0.6 m x 0.6 m which was filled with water as high as 0.4 m. This study is focused on studying the mechanism of bubble breakdown at the MBG outlet on the dissolution rate of oxygen (dissolved oxygen/DO) which is influenced by the volumetric flow rate of liquid (Q_L) and volumetric flow rate of air (Q_G). Various combinations of Q_L and Q_G values were systematically compared with the resulting oxygen mass transfer coefficient (KLa) values. Dissolved oxygen (DO) values were measured at a distance of 60 cm from the MBG outlet. The final results of the study revealed that the higher the Q_Lvalue, the more frequent the intensity of bubble bursting, the greater the number of bubbles produced with the smaller diameter and the higher the DO value, and vice versa. Whereas the higher the Q_Gvalue, the intensity of the bubble breakdown that occurs is relatively the same, the number of bubbles produced is less and the diameter is larger and the DO value is lower, and vice versa.
Co-Authors Agung Pambudi Ali Achmadi Arifiyanto Hadinegoro, Arifiyanto Bambang Supranoto Berkah Fajar Tamtomo kiono Budhijanto , Wiratni Budhijanto Deendarlianto Deendarlianto , Deendarlianto Deendarlianto Deendarlianto Deendarlianto Deendarlianto Hakeem Niyas IGNB Catrawedarma Indarto , Indarto Indarto - Indarto Indarto Indarto Indarto Indarto Indarto JUNAIDI, MUKSAN Kahartoni, Kahartoni Korawan, Agus Dwi Kumara Ari Yuana Kumara Ari Yuana M. Slamet Riyadi Mai Salem Marahendra , Wawan Dedi Marahendra Mudjijanto Mudjijanto Ratna Dwi Rahayu Ristiyanto, Hartono Guntur Rosadila Febritasari Sarip Sarip Sarjono Sarjono suryani, puput eka Suryanto, Hendri Sutarto, Eko Teguh Wibowo Wibawa Endra Juwana Wiratni Budhijanto Wiratni Budhijanto Wiratni Budhijanto Yongki Christandi Batubara Yuana, Kumara Ari