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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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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.
Experimental Test of Ignition Timing with Programable CDI on Performance Single Cylinder Otto Engine Rendy Adhi Rachmanto; Martinus Darmawan Bagas Wijayanto; Wibawa Endra Juwana; Pramodkumar Siddappa Kataraki
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.58951

Abstract

Ignition timing is sparking from the spark plug based on the ignition angle during the compression stroke in the combustion chamber relative to the piston position and the crankshaft angular speed. Adjusting the ignition angle is one method to optimize the combustion process in the engine. An optimal combustion process can improve engine performance and reduce fuel consumption. This study investigates optimal data from ignition angle changes using a programmable Capacitive Discharge Ignition (CDI). The test was performed on a single-cylinder four-stroke Otto engine with standard ignition angle variations, +3°, +6°, and +9° before Top Dead Centre (TDC). The test results show that torque and power have increased while brake-specific fuel consumption has decreased. Optimal data acquisition at ignition angle of +9° with peak torque value of 6.91 Nm and peak power value of 4.80 kW, while the lowest value of specific fuel consumption is 0.234 kg/kWh, and the highest value of thermal efficiency is 36%. From this study, it was concluded that the ignition timing could affect the engine performance.
Experimental Study Influences Changes In Compression Ratio To Performance Of Single Cylinder Otto Engine Wibawa Endra Juwana; Rendy Adhi Rachmanto; Mugi Wiyono; Iwan Istanto
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.59487

Abstract

Increasing the compression ratio is an attempt to increase the efficiency and performance of the engine. The purpose of the study was to analyze the effect of changes in the compression ratio on engine performance. Tests using a single-cylinder Otto engine by comparing the performance of an enlarged compression ratio of 9.7:1 and 10.4:1 with a standard compression ratio of 9.0:1. The result of the research is that the compression ratio of 9.7:1 produces a peak torque of 7.51 Nm at 6000 rpm, a peak power of 5.30 kW at 8000 rpm, and the lowest Brake-Specific Fuel Consumption (BSFC) is 0.146 kg/kWh at 6000 rpm. Torque and power increased by 0.09 Nm and 0.28 kW, and Brake-Specific Fuel Consumption (BSFC) decreased by 0.018 kg/kWh compared to the standard compression ratio of 9.0:1. Using a compression ratio of 10.4:1 produces a peak torque of 7.69 Nm at 6000 rpm, a peak power of 5.38 kW at 8000 rpm, and the lowest Brake-Specific Fuel Consumption (BSFC) is 0.116 kg/kWh at 6000 rpm. Torque and power increased by 0.27 Nm and 0.36 kW, and Brake-Specific Fuel Consumption (BSFC) decreased by 0.030 kg/kWh compared to the standard compression ratio of 9.0:1.
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 .