FERNANDES, YOGI EKA (2018) Studi Numerik Karakteristik Aliran 3d Didalam Square 90o Elbow Dengan Inlet Disturbance Body Berbentuk Diamond. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Saluran udara merupakan komponen penting untuk mengkondisikan udara yang dibutuhkan dari suatu bangunan. Konstruksi saluran udara terdapat berbagai komponen yang menunjang fungsi saluran tersebut. Elbow 90o berfungsi untuk membelokkan arah aliran udara. Aliran fluida yang melintasi elbow 90o akan mengalami pressure drop lebih besar dari pada melintasi saluran udara lurus dengaan kecepatan free stream yang sama, sehingga akan terjadi kerugian energy yang lebih besar.
Penelitian secara numerik ini berupa ducting dengan penampang square yang terdiri dari: upstream straight channel, rectangular elbow 90o, downstream straight channel, serta dilengkapi aksesoris berupa Inlet Disturbance Body (IDB) yang diletakkan di 10o elbow. Fluida kerja yang digunakan dalam simulasi berupa udara dengan variasi reynolds number 15500, 47700, 95500. Pengujian dilakukan dengan variasi diameter dari IDB. Penelitian ini dilakukan secara numerik menggunakan perangkat lunak simulasi CFD.
Hasil yang diperoleh dari penelitian menunjukkan bahwa nilai pressure drop pada bagian inlet dan outlet pada elbow 900 sangat dipengaruhi oleh adanya IDB. Penambahan IDB tidak lebih baik dalam menurunkan pressure drop pada recrangular elbow 90o. Hal ini disebabkan karena adanya IDB membentuk shear layer yang cukup kuat melawan adverse pressure pada sisi inner dan outer wall elbow. Namun pada ducting secara perbagian, penambahan IDB efektif mengurangi pressure drop terutama pada bagian elbow dengan penambahan IDB d/Dh=0.064.
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The air duct is an essential component for conditioning the required air from a building. Construction of the air duct there are various components that support the function of the channel. Among them are valves (valve), guide vane, elbow 90o, and so forth. Elbow 90o serves to deflect the direction of air flow. The fluid flow across the 90o elbow will experience a greater pressure drop than crossing a straight air duct with the same free stream speed, resulting in greater energy losses.
This numerical study is a square-sectional duct consisting of: upstream straight channel, rectangular elbow 90o, downstream straight channel, and equipped with Inlet Disturbance Body (IDB) accessories placed inside the elbow at position 10o. Working fluid used in the air simulation with variations in Reynolds numbers 15500, 47700, 95500. The test is done with the diameter variation on IDB. This research is done numerically using CFD simulation software.
The results obtained from the research indicate that the pressure drop value of the inlet and outlet on the elbow 900 is strongly influenced by the IDB. Addition of IDB d / Dh=0.064 most effectively lowers the pressure drop on the 90o rectangular elbow. This is because the IDB forms a fairly strong shear layer against adverse pressure on the inner side and outer wall elbow. However in overall duct, the addition of IDB is not effective against reducing pressure drop. The existence of IDB such as adding minor losses on the channel that causes pressure drop up.
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| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Square ducting, elbow 90o, pressure drop, profil kecepatan. |
| 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: | Fernandes Yogi Eka |
| Date Deposited: | 18 Jun 2021 11:47 |
| Last Modified: | 18 Jun 2021 11:48 |
| URI: | http://repository.its.ac.id/id/eprint/55505 |
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