Romandoni, Nanang (2015) Pengaruh Circumferential Angle Dan Radial Distance Rectangular Obstacle Pada Tube Bank Fin Heat Exchangers Terhadap Karakteristik Aliran Dan Perpindahan Panas. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Tube banks fin heat exchanger merupakan alat yang diaplikasikan untuk mentransfer panas dari liquid-to-air atau refrigerant-to-air. Peningkatan transfer panas dalam alat ini terus dikembangkan yaitu menggunakan obstacle. Penggunaan obstacle selain meningkatkan heat transfer juga berkorelasi dalam peningkatan pressure drop. Oleh karena itu, perlu dilakukan penelitian untuk mengoptimalkan penggunaan obstacle.
Analisa numerik secara 2D dilakukan untuk memperoleh karakteristik aliran dan perpindahan panas pada tube banks fin heat exchanger tersusun staggered yang menggunakan rectangular obstacle. Dalam penelitian ini, kombinasi optimal antara circumferential angle (α) dan radial distance (Rl/D) dari obstacle dievaluasi secara numerik menggunakan CFD code Fluent. Parameter optimasi yang digunakan dalam penelitan ini adalah Performance Evaluation Criteria (PEC). Variasi dilakukan pada α=300-400 dan Rl/D=0,66-0,90 dengan ReD=4000.
Hasil penelitian mengindikasikan bahwa variasi α dan Rl/D dari rectangular obstacle secara signifikan mampu meningkatkan average Nusselt number dan pressure drop. Faktor peningkatan average Nusselt number dan pressure drop tersebut antara lain disebabkan oleh blockage effect dari tube dengan rectangular obstacle di rear tube dan nozzle effect dari konfigurasi rectangular obstacle di centerline mainstream. Ini berkontribusi terhadap berkurangnya wake region size dan meningkatnya kecepatan aliran yang menuju tube row 2 dan 3. Jika ditinjau dari trend grafik average Nusselt number, pressure drop, London area goodness factor, dan JF factor maka dapat ditentukan bahwa kombinasi optimal dari penggunaan rectangular obstacle pada tube banks tersusun staggered adalah α=300 dengan Rl/D=0,66.
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Tube bank fin heat exchangers are commonly used to heat transfer from liquid to air or refrigerant to air. Improving the heat transfer ability of tube bank fin heat exchangers can be developed by obstacle. In addition to increasing the heat transfer, obstacle is also contributed on pressure drop. Therefore, it is continually needed to research of heat transfer performance in tube bank fin heat exchangers.
The effects of obstacle on flow pattern and heat transfer characteristic in tube banks staggered arrangement are investigated using computational fluid dynamics (CFD) method code Fluent. The numerical involved two-dimensional flow and conjugate heat transfer in the computational domain, which was set up to model the entire flow channel in the air flow direction. In this study, optimal combination both circumferential angle (α) and radial distance (Rl/D) rectangular obstacle are analyzed from point of view of Performance Evaluation Criteria. Variations are performed on Reynold number (based on tube diameter) at 4000, the circumferential angle from 30 to 45 degree, and radial distance from 0,66 to 0,90.
The results indicates that the enhanced configurations α and Rl/D of rectangular obstacles can be significantly increased average Nusselt number and pressure drop. Factors increased in average Nusselt number and pressure drop are partly due to the blockage effect of a tube with a rectangular obstacle in the rear tube and nozzle configurations effect of rectangular obstacle in mainstream centerline. This contributes to reduction of wake region size and the increase of velocity into the tube row 2 and 3. It was found that the rectangular obstacle with circumferential angle of 30 degree and a radial distance of 0,66 provides the best integrated performance over the Reynolds number computed.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTM 621.402 2 Rom p |
| Uncontrolled Keywords: | Simulasi numerik, optimalisasi, rectangular obstacle, dan tube banks fin heat exchanger |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | Mr. Marsudiyana - |
| Date Deposited: | 17 Dec 2019 07:05 |
| Last Modified: | 17 Dec 2019 07:05 |
| URI: | http://repository.its.ac.id/id/eprint/72400 |
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