Simulasi Numerik Aliran Tiga Dimensi Melalui Rectangular Duct Dengan Variasi Bukaan Damper

Putra, Edo Edgar Santosa (2016) Simulasi Numerik Aliran Tiga Dimensi Melalui Rectangular Duct Dengan Variasi Bukaan Damper. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dalam sistem ducting terdapat banyak penggunaan elbow dan assesoris lain yang akan menyebabkan terjadinya kerugian tekanan pada aliran. Hal tersebut disebabkan karena adanya perubahan arah aliran fluida yang melalui saluran tersebut. Nilai penurunan tekanan (pressure drop) pada aliran yang melalui suattu saluran dipengaruhi oleh besarnya laju aliran pada inlet, serta radius kelengkungan dari elbow yang akan menyebabkan aliran sekunder kemudian timbul aliran vortex. Hal ini berakibat kerugian energy (headloss) yang lebih besar. Peletakan bodi pengganggu dan pemasangan elbow dimaksudkan untuk melihat fenomena aliran di sekitar bodi pengganggu Model uji yang akan digunakan di dalam studi ini berupa rectangular ducting yang pada bagian inlet terpasang elbow 90o dengan damper yang diletakkan pada jarak x/Dh=2. Fluida kerjanya adalah udara yang mengalir secara incompressible, viscous, steady dan mempunyai profil kecepatan uniform pada sisi inlet dengan dua variasi bilangan Reynolds yaitu 2.05 x 105 dan 8.2 x 105serta empat pengaturan sudut bodi pengganggu 0o, 10o, 20o, dan 30o Penelitian dilakukan secara numerik 3D menggunakan piranti lunak Computation Fluid Dynamics (CFD) komersial dengan model turbulensi k-ε Realizable. Hasil studi ini diperoleh bahwa proses recovery aliran dipengaruhi oleh sudut bukaan damper. Sudut bukaan damper 30° terjadi percepatan aliran pada daerah dekat dinding yang berakibat bertambahnya momentum aliran sehingga mempercepat proses recovery aliran dan aliran sekunder pada daerah dekat dinding dapat teratasi. ================================================================================================================== In a ducting system there are so many fitting is used such as elbow and others fitting causes pressure drop. Pressure drop is caused by changes of flow direction which through of it. Pressure drop in a ducting system is influenced by mass flow rate of inlet and curvature radius of elbow which can appear secondary flow, then it develops vortex. Consequences, it causes greater head loss. Installation of disturbance body and elbow is intended to observe flow phenomenon around disturbance body The testing model that is used in this simulation is a rectangular duct which is installed 90o elbow on a inlet and damper that located at x/Dh=2. Fluid material is air which incompressible flow, viscous, steady and it has uniform profile velocity on inlet with two variant of Reynolds number are 2.05× 105 and 8.2×105, it runs with four adjustment angle of damper 0o, 10o, 20o, and 30o. Research is held in numerical, three dimensional uses Computation Fluid Dynamics (CFD) commercial software with k-ε Realizable turbulent model. As a result, it is obtained that recovery flow is influence by damper opening. In angle of 30° occurs acceleration on near-wall region which increases flow momentum, as of increase recovery process and secondary flow which occurs on near-wall region can be solved.

Item Type: Thesis (Undergraduate)
Additional Information: RSM 620.106 4 Put s
Uncontrolled Keywords: Ducting, elbow, pressure drop, aliran sekunder, head loss, vortex, damper
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: Users 13 not found.
Date Deposited: 03 Jul 2017 08:12
Last Modified: 27 Dec 2018 04:25
URI: https://repository.its.ac.id/id/eprint/41853

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