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All Journal Rotasi Rekayasa Mesin Journal of Energy, Mechanical, Material and Manufacturing Engineering JMM (Jurnal Masyarakat Mandiri) Jurnal Teknik Mesin Indonesia Mekanika: Majalah Ilmiah Mekanika ASEAN Journal of Chemical Engineering Automotive Experiences Journal of Engineering and Technological Sciences
Wibawa Endra Juwana, Wibawa Endra
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Sebelas Maret, Ir. Sutami Street No.36A, Surakarta, Indonesia
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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Performance of Porous-Venturi Microbubble Generator for Aeration Process Afisna, Lathifa Putri; Juwana, Wibawa Endra; Indarto, Indarto; Deendarlianto, Deendarlianto; Nugroho, Fellando Martino
Journal of Energy, Mechanical, Material and Manufacturing Engineering Vol 2, No 2 (2017)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (698.696 KB) | DOI: 10.22219/jemmme.v2i2.5054

Abstract

Qualified and preserved water is declining due to metal, waste, and hazardous chemicals contamination. Demand on fresh water raises and leads to the efforts on processing waste water with effective and efficient technology. Microbubble generator technology developed lately to result dissolved oxygen for raising microorganisms to decompose waste in waste water. This research used porous-ventury microbubble generator with 30° inlet angle and 20° outlet angle, placed in the center of 280 cm x 60 cm x 40 cm aquarium for experiment. This research aimed to find out bubble distribution and microbubble generator (MBG) performance. Measurement on bubble distribution conducted using Phantom Control Camera. Obtained data analyzed using MATLAB R2016a, while MBG performance measured using pressure transducer. Analysis conducted on variations of gas debit (0,1 lpm; 0,4 lpm., and 1 lpm) and water debit (30- 80 lpm) effects toward performance parameters, such as hydraulic power (Lw) and bubble generating efficiency (ηB). Results show that the greatest microbubbles’ diameter is 150- 500 μm, hydraulic power (Lw) increases with the inclining water debit (QL), effect of gas debit variation exert low effect towards Lw, and declining number of bubble generating efficiency (ηB) parameter with the inclining number of the water debit (QL).
STUDI EKSPERIMENTAL PENINGKATAN PERPINDAHAN PANAS ALIRAN TURBULEN PADA PENUKAR KALOR PIPA KONSENTRIK DENGAN PERFORATED TWISTED TAPE INSERT WITH PARALLEL WINGS Yaningsih, Indri; Istanto, Tri; Juwana, Wibawa Endra
ROTASI Vol 17, No 3 (2015): VOLUME 17, NOMOR 3, JULI 2015
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (463.21 KB) | DOI: 10.14710/rotasi.17.3.120-129

Abstract

Heat transfer, flow friction and thermal performance factor characteristics in a concentric pipe heat exchanger fitted perforated twisted tape insert with parallel wings (PTPW), using water as working fluid are investigated experimentally. The design of PTPW involves the following concepts: (1) wings induce an extra turbulence near tube wall and thus efficiently disrupt a thermal boundary layer (2) holes existing along a core tube, diminish pressure loss within the tube. The experiments are conducted using the PTPW with the three wing depth ratio (w/W = 0.16, 0.24 and 0.32) and constant the hole diameter ratio (d/W) of 0.24 over a Reynolds number range of 5800–18,500. A typical twisted tape insert (TT) was also tested for a comparison. The results show that both mean Nusselt number and mean friction factor associated by all twisted tape are consistently higher than those without twisted tape (plain tube). It is also found that Nusselt number, friction factor and thermal performance factor increase with increasing wing depth ratio. Over the range considered, Nusselt number and friction factor in a concentric pipe heat exchanger with the PTPW are, respectively, 1.14–1.42 and 1.12–1.40 times of those in the tube with typical twisted tape (TT).
Rancang bangun sistem rem anti-lock brake system (abs) dengan penambahan komponen vibrator solenoid zakaria .; Wibowo .; Wibawa Endra Juwana
Jurnal Teknik Mesin Indonesia Vol 11 No 2 (2016): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (867.544 KB) | DOI: 10.36289/jtmi.v11i2.59

Abstract

This study aims to analyze the vibration of the braking system equipped by solenoid vibrator component arranged with a control system to produce an ABS effect. Data collection is done by using slam stick. The results showed that the frequency domain signal with the addition of the solenoid vibrator component had peaks at 10 Hz frequency, while the frequency domain signal during braking without the addition of the solenoid vibrator component there were no peaks at 10 Hz frequency. From the data, the ABS braking system works in accordance with the ABS braking system that provides 10 Hz signal.
Pengaruh laju aliran coolant campuran air dengan ethylene glycol terhadap laju perpindahan panas dan penurunan tekanan radiator otomotif Bernadus Nanang Dwi Nuryanto; Tri Istanto; Wibawa Endra Juwana
Jurnal Teknik Mesin Indonesia Vol 11 No 2 (2016): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (821.286 KB) | DOI: 10.36289/jtmi.v11i2.56

Abstract

This experimental study was conducted to examine the heat transfer rate and pressure drop on corrugated louver fin with triangular channel radiator. Radiator tube and fin were made of aluminium. Cold fluid flows verticaly from top side to bottom while air flows horizontaly (crossflow heat exchanger). Water and 20% Ethylene glycol were used as hot fluid (coolant) and maintained at constant temperature of 80 oC and varied at flow rate of 25 lpm, 30 lpm, 35 lpm, dan 40 lpm. Where as air was used as cold fluid having its velocity varied at 1.5 m/s, 2 m/s, 2,5 m/s and 3 m/s. And air intake temperature was maintained around 30 oC. The result shows the higher water flow rate in the radiator tube, resulting in higher value of heat transfer rate, and coolant pressure drop. Ethylene glycol mixing composition into the coolant, affects on decreasing the heat transfer rate. The highest heat transfer rate enhancement was obtained at water coolant usage. Ethylene glycol mixing affects the increasing coolant-side pressure drop.
Karakteristik aliran dua fase pada saluran ekspansi tiba-tiba Latif Ngudi Wibawanto; Budi Santoso; Wibawa Endra Juwana
Jurnal Teknik Mesin Indonesia Vol 11 No 1 (2016): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (771.182 KB) | DOI: 10.36289/jtmi.v11i1.44

Abstract

This research was conducted to find out the flow characteristic of two phases through the channel with sudden expansion in the form of change of flow pattern and pressure recovery. The test was carried out with variation of superficial velocity of water 0.2-1.3 m / s and superficial air velocity of 0.2-1.9 m / s resulting in pattern of three flow patterns ie bubble, plug, and slug. The expansion channel resulted in some changes to the flow pattern that originally plugs in the upstream channel into bubble in the downstream channel and the slug becomes plug. Pressure recovery experimental results compared with the homogeneous model flow equation and Wadle correlation, both correlations have predictions with standard deviation values of 0.32 and 0.43.
Aerodynamic Characteristics of Ahmed Body with Inverted Airfoil Eppler 423 and Gurney Flap on Fastback Car Zainal Arifin; Suyitno Suyitno; Dominicus Danardono Dwi Prija Tjahjana; Wibawa Endra Juwana; Rendy Adhi Rachmanto; Chico Hermanu Brillianto; Ubaidillah Ubaidillah; Singgih Dwi Prasetyo; Arinal Falah Muhammad; Mohd Afzanizam Mohd Rosli
Automotive Experiences Vol. 5 No. 3 (2022)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.7067

Abstract

The installation of aerodynamic devices, such as rear wings with the application of a Gurney flap, is very important to improve the performance of vehicles and can generate downforce and reduce slip when a car turns and brakes. The goal of this study was to determine the aerodynamic characteristics of the addition of a rear wing using an Eppler 423 airfoil, which was applied with a Gurney flap featuring variations in the angle of attack and the height of the Gurney flap. The rear wing was mounted on the Ahmed body with a rear slant angle of 15°, which is similar to the configuration on a fastback type car. This research was conducted by 3D modeling through computational fluid dynamics (CFD) simulation using ANSYS Student R18.2 by using ahmed body design. There are three variations in the angle of attack for the rear wing (0°, 7.5°, and 15°), as well as five variations in Gurney flap height of 0%, 0.5%, 1%, 1.5%, and 2% for the chord-line length. In this study, the best variation was found at an angle of attack of 15⁰ with a height of 2% C. From this configuration improved CL/CD ratio by 25.36% when compared to the results without a Gurney flap.
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.
WAHANA PAPAN SELUNCUR SEBAGAI SARANA INTERAKSI ANAK DENGAN DUNIA LUAR Zainal Arifin; Rendy Adhi Rachmanto; Suyitno Suyitno; Dominicus Danardono Dwi Prija Tjahjana; Wibawa Endra Juwana; Yudin Joko Prasojo; Singgih Dwi Prasetyo
JMM (Jurnal Masyarakat Mandiri) Vol 7, No 5 (2023): Oktober
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jmm.v7i5.17476

Abstract

Abstrak: Taman bermain merupakan lingkungan yang dirancang khusus untuk menyediakan kesempatan bermain, belajar, dan berinteraksi bagi anak-anak. Taman bermain tidak hanya merupakan tempat hiburan semata, tetapi juga berperan sebagai ruang pendidikan yang mendukung perkembangan fisik, kognitif, sosial, dan emosional anak-anak. Pengabdian ini bertujuan untuk merancang desain wahana bermain papan seluncur yang dirancang dengan mempertimbangkan faktor keselamatan, kenyamanan, dan pengembangan anak di Taman Mekarsari Desa Kaligentong, Kecamatan Gladagsari, Kabupaten Boyolali. Papan seluncur merupakan sebuah wahana dengan bentuk seperti seluncuran yang difungsikan sebagai sarana anak-anak untuk berinteraksi pada lingkungan luar. Metode yang digunakan pada pengabdian ini berupa deskriptif kualitatif yang dilakukan melalui tahapan wawancara dan observasi. Pengabdian ini merupakan kolaborasi antara dosen dan mahasiswa Program Studi Teknik Mesin, Universitas Sebelas Maret, Surakarta dengan Kelompok Tani (PokTan) Desa Kaligentong, Gladagsari, Boyolali sebagai pengelola Taman Mekarsari. Evaluasi yang dilakukan untuk wahana bermain ini yaitu dengan melakukan simulasi percobaan papan seluncur secara langsung. Dari kolaborasi ini didapatkan hasil berupa desain papan seluncur yang kokoh dan dibuatnya wahana bermain papan seluncur yang aman dan nyaman di Taman Mekarsari. Diharapkan dengan adanya wahana bermain ini dapat mendorong interaksi sosial dan pengembangan keterampilan anak-anak sehingga dapat meningkatkan kualitas hidup dengan memberikan kesempatan bermain dan belajar secara menyeluruh.Abstract:  Playgrounds are environments specifically designed to provide opportunities for children to play, learn and interact. Playgrounds are not only places of entertainment, but also act as educational spaces that support children's physical, cognitive, social, and emotional development. This service aims to design a skateboard playground that is designed by considering safety, comfort, and child development factors at Mekarsari Park, Kaligentong Village, Gladagsari District, Boyolali Regency. Papan seluncur is a vehicle with a shape like a slide that functions as a means for children to interact with the outside environment. The method used in this service is descriptive qualitative which is carried out through interviews and observations. This service is a collaboration between lecturers and students of the Mechanical Engineering, Universitas Sebelas Maret, Surakarta with the Farmer Group (PokTan) of Kaligentong Village, Gladagsari, Boyolali as the manager of Mekarsari Park. The evaluation carried out for this playground is by simulating the papan seluncur experiment directly. From this collaboration, the results were obtained in the form of a sturdy papan seluncur design and the creation of a safe and comfortable papan seluncur playground in Mekarsari Park. It is hoped that this playground can encourage social interaction and skill development of children to improve the quality of life by providing comprehensive play and learning opportunities.  
SIMULATION-BASED ASSESSMENT KINERJA TERMAL PADA CONCENTRIC TUBE HEAT EXCHANGER Kristiawan, Budi; Wijayanta, Agung Tri; Juwana, Wibawa Endra; Rachmanto, Rendy Adhi; Enoki, Koji; Prasojo, Arfi Singgih
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.v14i3.1372

Abstract

The double-pipe heat exchanger is one of the most popular heat exchanger devices. In this study, the concentric tube heat exchanger as the double pipe heat exchanger device was simulated with ANSYS code FLUENT. The simulation was done by based on the Reynolds number variation from 400010.000 using the method of co-current and counter flow. The hydrodynamic and thermal simulation results agree with the empirical correlation of the Pethukov and Dittus-Bolter equations, respectively. The friction factors of the water base fluid and nanofluid f TiO2/water f (0.1 vol.%) do not result in a significant difference in the turbulent flow regime for both co-current and counter flow. The thermal performance of TiO2/water (0.1% vol) nanofluid as indicated by the value of the heat transfer coefficient results in an increase of 6.9% for counter low flow and 6.0% for co-current flow. Meanwhile, the direction of fluid flow in the heat exchanger does not have a significant effect on its thermal performance.
Enhancing Biogas Production through the Co-Digestion of Indigofera and Cow Manure for Electricity Generation Suyitno, Suyitno; Juwana, Wibawa Endra; Muqoffa, Mohamad
Journal of Engineering and Technological Sciences Vol. 57 No. 3 (2025): Vol. 57 No. 3 (2025): June
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.3.1

Abstract

The research examines the augmentation of biogas generation through the co-digestion of Indigofera tinctoria waste and cow manure, emphasising the optimization of parameters for enhanced efficiency. Anaerobic digestion presents potential for sustainable waste management and renewable energy generation. The initial discussion underscores the significance of Indigofera tinctoria, alongside challenges in managing agricultural and organic waste. The methodology encompasses substrate preparation, reactor design, and biogas utilization for electricity generation. Results indicate that substrate feeding rates and pH levels significantly influence biogas production, with optimal efficiency observed when pH is maintained between 6 and 7. Feeding rates are identified as a critical factor, highlighting the necessity for precise optimization. Additionally, managing hydrogen sulfide content is vital to mitigate corrosion risks, which can be addressed through adjustments to substrate composition. An interaction analysis between substrate feeding rates and pH revealed no significant combined effects, emphasizing the importance of understanding individual parameter dynamics to maximize production efficiency. Optimal load conditions were identified, with diminishing returns observed beyond a specific threshold. This study provides valuable insights into improving biogas production efficiency from Indigofera tinctoria waste and cow manure. Key recommendations include the optimization of substrate composition and stringent pH regulation to promote sustainable biogas production practices. Future research is encouraged to further refine biogas technology and advance its application in renewable energy systems.
Co-Authors Afisna, Lathifa Putri Arinal Falah Muhammad Bernadus Nanang Dwi Nuryanto Budi Kristiawan, Budi Budi Santoso Budi Santoso Chico Hermanu B.A. Danardono Dwi Prija Tjahjana, Dominicus Deendarlianto Deendarlianto Deendarlianto Dominicus Danardono Dwi Prija Drajat Indah Mawarni Enoki, Koji IGNB Catrawedarma Indarto Indarto Indarto Indarto Indri Yaningsih Iwan Istanto Kumara Ari Yuana Latif Ngudi Wibawanto Latif Ngudi Wibawanto Martinus Darmawan Bagas Wijayanto Mohamad Muqoffa Mohd Afzanizam Mohd Rosli Mugi Wiyono Nugroho, Fellando Martino Pramodkumar Siddappa Kataraki Prasojo, Arfi Singgih Rachmanto, Rendy Adhi Rahmad Rizki Nur Arifin Rendy Adhi Rachmanto Rumi Iqbal Doewes, Rumi Iqbal Satria Auliansyah Singgih Dwi Prasetyo Suyitno - Suyitno Suyitno Suyitno Suyitno Suyitno Suyitno Tri Istanto Tri Istanto Trismawati Trismawati Ubaidillah Ubaidillah Ubaidillah Ubaidillah Ubaidillah Ubaidillah Wibowo . Wijayanta, Agung Tri Wiratni Budhijanto Yudin Joko Prasojo Zainal Arifin Zainal Arifin zakaria .