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. Tubes--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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