Studi Eksperimen Pengaruh Upstream Disturbance Body Terhadap Gaya Hambat Silinder Tunggal Dan Pressure Drop Saluran

Ma`arif, Saiful (2015) Studi Eksperimen Pengaruh Upstream Disturbance Body Terhadap Gaya Hambat Silinder Tunggal Dan Pressure Drop Saluran. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Gaya drag dipengaruhi oleh beberapa hal yaitu intensitas turbulensi aliran, geometri suatu benda, kekasaran permukaan dan lain-lain. Intensitas turbulensi aliran yang melintasi benda dapat dipengaruhi pengganggu yang berada di depan permukaan benda tersebut. Penelitian ini bertujuan untuk mengetahui pengaruh silinder pengganggu terhadap gaya drag silinder tunggal dan juga pressure drop saluran. Penelitian ini dilakukan secara eksperimen pada sebuah wind tunnel berdimensi 200 mm x 200 mm x 1800 mm. Benda uji yang digunakan berupa silinder sirkular berdiameter (D) 25 mm yang disusun secara tandem terhadap Upstream Disturbance Bodi (UDB) berbentuk silinder sirkular. Diameter UDB (d) yaitu 4 mm dan 8 mm. Variasi jarak antar silinder L/D 1,25-3,00 dengan interval 0,25. Bilangan Reynolds (ReDh) yang digunakan dalam pengambilan data pressure drop 7,37x104 ; 8,04x104 ; 9,38x104 ; 1,07x105 ;1,2x105. Untuk pengambilan data koefisien tekanan dan perhitungan koefisien drag secara eksperimen digunakan ReDh 7,37x104 pada L/D 1,75 ; d/D 0,16, L/D 2,0 ; d/D 0,32 dan ReDh 1,07x105 pada L/D 1,25 untuk d/D 0,16 maupun 0,32. Hasil yang diperoleh menunjukkan nilai pressure drop susunan terendah yaitu 1,2 kali nilai pressure drop silinder tunggal terjadi pada variasi L/D 1,25 dan d/D 0,32. Pada susunan ini pula, koefisien drag tekanan silinder turun sebesar 42% dari koefisien drag tekanan silinder tunggal. ========== Drag force was influenced by turbulent intensity, bluff body’s geometry, and contour’s roughness. Disturbance body which is laid in front of main body can change the turbulent intensity. The objective of this present study was to investigate experimentally the influence of upstream disturbance body on the single cylinder’s drag force and on the duct’s pressure drop. Experiment was conducted in a wind tunnel with a test section of 200 mm width, 200 mm height, and 1800 m length. The Upstream Disturbance Body (UDB) was laid on the upstream of main circular cylinder (D = 25 mm). The diameter of Upstream Disturbance Body ranged from 4mm and 8mm. The spacing ratio of main cylinder to Upstream Disturbance Body (UDB) were varied from L/D 1,25-3,00 with interval of 0,25. Reynolds Number based on hydraulic diameter (ReDh ) for pressure drop’s experiment ranged from 7,37x104 ; 8,04x104 ; 9,38x104 ; 1,07x105 ;1,2x105. The drag coefficient of main circular cylinder decreased about 42% when a pair of 8 mm Upstream Disturbance Body (UDB) was installed at spacing ratio (L/D) 1,25. The maximum value of pressure drop from this variation was 1,2 times higher than pressure drop of single cylinder.

Item Type: Thesis (Undergraduate)
Additional Information: RSM 620.106 4 Maa s 3100015061557
Uncontrolled Keywords: silinder sirkular, koefisien drag, bilangan Reynolds, UDB, circular cylinder, drag coefficient, Reynolds Number, pressure coefficient
Subjects: Q Science > QA Mathematics > QA911 Fluid dynamics. Hydrodynamics
T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics.
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: - Davi Wah
Date Deposited: 10 Dec 2019 02:01
Last Modified: 10 Dec 2019 02:01
URI: http://repository.its.ac.id/id/eprint/72265

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