Studi Numerik Dan Eksperimental Aliran Melalui Square Duct Dan Square Elbow 90o Dengan Variasi Bukaan Sudut Double Damper

Hakim, Luthfi (2016) Studi Numerik Dan Eksperimental Aliran Melalui Square Duct Dan Square Elbow 90o Dengan Variasi Bukaan Sudut Double Damper. Masters thesis, Institut Technology Sepuluh Nopember.

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Abstract

Saluran udara (ducting system) berfungsi sebagai media pendistribusian udara dari satu sumber ke beberapa sumber yang diinginkan. Pada saluran udara terdapat komponen yang terdiri dari saluran upstream, saluran downstream, sambungan (fitting), belokan (elbow 900), dan katup (damper). Komponenkomponen tersebut mempunyai koefisien losses dan menyebabkan pressure drop sepanjang aliran sehingga menambah kerugian energi dalam sistem. Pressure drop yang lebih besar pada elbow disebabkan oleh friction loss, separation loss dan secondary flow. Nilai Pressure drop pada aliran yang melalui suatu saluran dipengaruhi oleh besarnya laju aliran pada sisi inlet dan radius kelengkungan dari elbow yang akan menyebabkan aliran sekunder kemudian timbul vortex. Penelitian dilakukan secara simulasi dan eksperimen, simulai dilakukan dengan bantuan piranti lunak computational fluid dynamic (CFD) komersial untuk menganalisa karakteristik aliran melalui square duct dan square elbow dengan variasi sudut bukaan double damper 0o, 30o clocwise (CW) dan 30o conter clockwise (CCW). Double damper di letakkan pada jarak ( = diameter hidrolik dari duct) Pada daerah downstream setelah outlate elbow 90o. Hasil penelitian secara simulasi berupa kontur kecepatan , profil kecepatan, dan vector kecepatan pada masing-masing sudut bukaan double damper. Sedangkan secara eksperimen diperoleh profil kecepatan dan besarnya nilai koeefisien loss saluran, koefisien loss damper dan koeefisien loss elbow. Pada sudut bukaan double damper 30o CCW terjadi peningkatan nilai pressure drop sebesar 74,10 % sedangkan pada sudut bukaan double damper 30o CW sebesar 27,22 % jika dibandingkan dengan sudur bukaan double damper 0o. ============================================================================================================= Ducting system serves as a distribution medium of air from one source to keeping the desired source. In the airways, there are several components that consist of a channel upstream, downstream channel, fitting, elbow 90o and a valve (damper). These components has a coefficient of losses and cause a pressure drop along the flow thereby increasing energy losses in the system. Pressure drop is greater in the elbow caused by friction loss, separation loss and secondary flow. Value Pressure drop in flow through a channel is affected by the magnitude of the flow rate at the inlet and radius of curvature of the elbow that will cause secondary flow vortex then arise. Research conducted experiments and simulations, simulations are carried out with the help of commercial CFD software to analyze the flow characteristics through the square and square ducting elbow with double damper opening angle variation shaped horizontal angle 0°, 30° clocwise and 30o conter clockwise. Double damper is put at a distance 2Dh, (Dh = hydraulic diameter of the duct) On downstream after outlate elbow 90o The results will be obtained from this study quantitatively in the form of a graph of pressure drop and velocity profile. While qualitatively be obtained contours, vectors, and pathline for speed and pressure on the downstream area. In addition, it was found the percentage increase in the average value of the pressure drop at each opening angle double damper. An increase of 27.22% damper opening angle of 30o CW when compared with the angle of 0 ° and 74.10% increase in the opening angle 30o CCW.

Item Type: Thesis (Masters)
Additional Information: RTM 620.106 4 Hak s
Uncontrolled Keywords: Duct, Elbow, Double Damper, Profil Kecepata, pressure drop
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics.
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 22 Jan 2020 08:48
Last Modified: 22 Jan 2020 08:48
URI: http://repository.its.ac.id/id/eprint/72910

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