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All Journal Jurnal Teknik Mesin Jurnal Teknik ITS IPTEK The Journal for Technology and Science Warta Ardhia : Jurnal Perhubungan Udara Journal of Energy, Mechanical, Material and Manufacturing Engineering APPROACH: Jurnal Teknologi Penerbangan Jurnal Penelitian Prosiding SNITP (Seminar Nasional Inovasi Teknologi Penerbangan) JMES The International Journal of Mechanical Engineering and Sciences Mechanical Engineering for Society and Industry Sewagati International Journal of Renewable Energy Development EduInovasi: Journal of Basic Educational Studies
Wawan Aries Widodo
Institut Teknologi Sepuluh Nopember
Religion Aerospace Engineering Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation Other

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Journal : IPTEK The Journal for Technology and Science

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Plane Wall Effect of Flow around Two Circular Cylinders in Tandem Arrangement Triyogi Yuwono; Wawan Aries Widodo; Heru Mirmanto; Fahmi Fahreza
IPTEK The Journal for Technology and Science Vol 22, No 1 (2011)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v22i1.56

Abstract

The flow characteristic around two circular cylinders in tandem arrangement located near a plane wall were investigated experimentally in a uniform flow at a Reynolds Number of 5.3 x 104. The center to center spacing between the two cylinders relative to the cylinder diameter was constantly maintained at P/D = 1.5. The pressure distributions along the surface of the cylinder and the plane wall were measured by varying the gap-to-diameter of cylinder ratio (G/D) in the range of 0 < G/D < 0.467. Surface oil-film techniques were used to investigate the flow patterns on the cylinder. The result showed that for upstream cylinder, in the gap-to-diameter ratio G/D < /D, there is no stagnation point at front side of the upstream cylinder; it is gradually raised as the gap increase. For the downstream cylinder, a peak on the lower side of the front side of the cylinder is apparent in each of the pressure distributions. This peak represents the reattachment of shear layer that separates from lower side of the upstream cylinder. The reattachment point tends to move forward close to the angular position of  = 0o as the gap ratio increase. The shear layer bifurcates into two shear layers. One shear layer continues in the downstream direction, and the other shear layer flows in the upstream direction.
Steam Coil Air Heater (SCAH) Modelling as Porous Medium to Analyze Flow Characteristic and Reduce Self Energy Usage in Gresik Unit 1 Steam Power Plant Eko Ariyanto; Wawan Aries Widodo
IPTEK The Journal for Technology and Science Vol 30, No 1 (2019)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (604.39 KB) | DOI: 10.12962/j20882033.v30i1.4993

Abstract

This study deals with flow and heat transfer characteristic in a Heat Exchanger if its tube modules completely or partially dismantled. The heat exchanger is a Steam Coil Air Heater (SCAH) Installed in Gresik unit 1 Steam Turbine Power Plant. Nowadays the power plant operate mostly utilized natural gas as a fuel. When it utilized natural gas SCAH are not give benefit and only give flow resistance for combustion air flow. This study use numerical simulation model with commercial Computational Fluid Dynamic (CFD) software. The simulation on 3D model with steady state flow condition. The model use energy model, Heat Exchanger Model, realizable k-Epsilon for turbulence viscous model and SCAH model as Porous Medium (PM). Modelling SCAH as a PM will avoid time consuming mesh generation and simulations with high CPU usage. Fives scenarios of tube module dismantling simulated in 100% load. This study result both quantitative and qualitative data coresspond with flow and heat transfer characteristic. The model with original scenarios give good result in terms of pressure and outlet temperature with commisioning data. The contour data results show there are several secondary flow due to enlargement of flow area. Numerical results of variation S1,S2,S3,S4 are indicated decreasing total pressure drop about 32.27%, 51.29%, 47.04%, 65.25% respectively. And temperature rise for each schenario will decrease to 29.29% (S1), 46.51% (S2) , 47.92% (S3), 68.28% (S4) respectively,except for S5 have no pressure drop and temperature rise since all module are dismantled.
Co-Authors A. Grummy Wailanduw Adi Mochammad Isa’i Aisyah, Imaniar Fitri Akbar Masyian Makka Akbar, Aldiva Syawallad Andrew Jaya Nazar Anton Nugroho Aryawan, Wasis Dwi Bambang Juni Pitoyo Bambang Juni Pitoyo Bambang Junipitoyo Dhika Suryananda Drestanta Vidyasakti Wibowo Dwi Septyan Waluyo Eko Ariyanto Fahmi Fahreza Fajar Dwi Yudanto Fernando, David Franciska Enstinita Puspita Gunawan Sakti Hafizah, Nivana Haposan Misaelman Sinaga Herman Sasongko Heru Mirmanto Hutagalung, Sylvia Ilmi, Innastya Hafshah Irbatul Intan Pandang Prinda Sakti Kanda Wibisana Nirwana Kresna Adytia Putra Louis, Hendri Luthfi Hakim Mutiara Nuril Karomah Nur Ikhwan P. Indiyono Pitoyo, Bambang Juni Prabowo Prabowo Pratista Hariyanto Pribadi, Teuku Muhammad Burhanissulthan Reiza, Muhammad Naufal Rida Aries Arifah Rifqi Amin Muhlis Sakti, Gunawan Sambodo, Adi Aryndra Sampurno Saputra, I Nyoman Agus Adi Satryo Fadhian Shidqi Nugroho Setyo Hariyadi Shabrina, Dhia Fairuz sobar ihsan, sobar Suhardjono Supriadi Supriadi Supriadi Supriadi Sutardi Sutardi Sutardi Sutardi Sutardi Suwarno Suwarno Syifa&#039; Zain Salsabila Tiara Pradina Putri Titania Eriani Triyogi Yuwono Triyogi Yuwono Varien Janitra Nuralif Susanto Wiwid Suryono Wiwid Suryono Zain Lillahulhaq