FAILA, RIZKA NUR (2018) STudi Numerik Karakteristik Aliran Fluida Melalui Rectangular Elbow 90o Dengan Diamond Inlet Disturbance Body (D/Dh = 0.064, 0.080, DAN 0.100). Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Elbow merupakan salah satu konstruksi yang mampu mengendalikan perilaku fluida. Salah satu aplikasi elbow adalah pada ducting system untuk central air conditioner. Penggunaan elbow dalam perancangan ducting system, akan menyebabkan terjadinya kerugian tekanan pada aliran. Hal tersebut dikarenakan oleh perubahan arah aliran fluida yang melalui saluran. Nilai penurunan tekanan (pressure drop) pada aliran yang melalui elbow tersebut dipengaruhi oleh besarnya jari-jari kelengkungan dan sudut belok dari elbow, yang menyebabkan terjadinya separasi dan aliran sekunder (secondary flow) pada elbow. Pemasangan diamond sebagai pengganggu pada inner wall upstream duct diharapkan dapat mengurangi pressure drop, serta melawan adverse pressure dan wall shear stress yang diakibatkan adanya elbow 90º.
Penelitian ini bertujuan untuk mengetahui karakteristik aliran fluida di dalam rectangular elbow 90o dengan penambahan inlet disturbance body pada inner wall upstream duct berupa diamond. Variasi bodi diamond pengganggu d/Dh = 0.064, 0.080 dan 0.100. Model uji yang akan digunakan di dalam penelitian ini berupa rectangular elbow 90º. Sisi ducting elbow Dh = 125 mm, upstream duct memiliki panjang 7 Dh serta downstream duct memiliki panjang 15 Dh. Penelitian ini menggunakan metode numerik 3D dengan software Fluent 6.3.26 dengan turbulence model k-ɛ standard.
Hasil yang diperoleh dari penelitian menunjukkan bahwa nilai pressure drop pada bagian inlet, outlet dan elbow 900 sangat dipengaruhi oleh adanya DIDB. Penambahan DIDB d/Dh = 0.100 paling efektif menurunkan pressure drop pada recrangular elbow 90o. Hal ini disebabkan karena adanya DIDB membentuk shear layer yang cukup kuat melawan adverse pressure pada sisi inner dan outer wall elbow. Namun pada ducting secara keseluruhan, penambahan DIDB tidak efektif mengurangi pressure drop. Adanya DIDB seperti menambahkan minor losses pada saluran yang menyebabkan pressure drop naik.
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Elbow is one of the construction that capable of controlling fluid behavior. One of elbow application is on ducting system for central air conditioner. The use of elbow in the design of ducting system, will cause the loss of pressure of the flow. This is due to changes in the direction of fluid flow through the channel. The pressure drop in the flow through the elbow is influenced by the magnitude of the curvature radius and the turning angle of the elbow, causing separation and secondary flow to the elbow. Installation of the diamond as a disturbance in the inner wall upstream duct is expected to reduce pressure drop, as well as against adverse pressure and wall shear stress caused by 90º elbow.
This study aims to determine the fluid flow characteristics in the rectangular elbow 90º with the addition of inlet disturbance body on inner wall upstream duct with diamond form. Variations of diamond disturber body d/Dh = 0.064, 0.080 and 0.100. The test model to be used in this research is rectangular elbow 90º. Size ducting elbow Dh = 125 mm, upstream duct has 7 Dh length and downstream duct has 15 Dh length. This research uses 3D numerical method with Fluent 6.3.26 software with turbulence of k-ɛ standard model.
The results obtained from the research indicate that the pressure drop on the inlet, outlet and elbow 90º is greatly influenced by DIDB. Addition of DIDB d/Dh 0.100 is most effective reducing the pressure drop at recrangular elbow 90º. Due to DIDB forms a strong enough shear layer against adverse pressure on the inner side and outer wall elbow. However in overall ducting, the addition of DIDB is not effective in reducing pressure drop. The existence of DIDB such as adding minor losses on the channel that causes pressure drop increase.
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| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | rectangular elbow 90o, diamond inlet disturbance body, pressure drop, metode numerik |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | RIZKA NUR FAILA |
| Date Deposited: | 24 Jun 2021 01:21 |
| Last Modified: | 24 Jun 2021 01:21 |
| URI: | http://repository.its.ac.id/id/eprint/55014 |
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