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ITS » Undergraduate Theses » Teknik Mesin
Posted by reini@its.ac.id at 24/11/2011 13:41:46  •  1011 Views


STUDI EKSPERIMENTAL KARAKTERISTIK ALIRAN MELINTASI EMPAT SILINDER TERIRIS TIPE-I 537506 YANG TERSUSUN SECARA IN-LINED DENGAN JARAK ANTAR SILINDER LD4 DI DEKAT DINDING DATAR STUDI KASUS UNTUK PENGARUH JARAK GAP1.0678804GD88041267

EXPERIMENTAL STUDY ABOUT FLOW CHARACTERISTICS PASSING THROUGH FOUR SLICED CYLINDERS I-TYPE 53 LAPPED OVER IN-LINEDLY WITH LENGTH DISTANCE LD 4 NEAR SIDE WALL CASE STUDY FOR GAP RATIO 10678804GD88041267

Author :
OKTAVIA, DEVY  ( 2107100158 )




ABSTRAK

Berbagai penelitian menunjukkan banyak hal yang menarik mengenai fenomena fluida ketika beberapa bodi diletakkan berdekatan dan akan menjadi bahasan yang menarik karena susunan tersebut seringkali diletakkan didekat dinding datar. Aplikasi dari penelitian ini pada dunia teknik diantaranya adalah konfigurasi shell and tube pada heat exchanger konfigurasi perpipaan didasar laut dan sebagainya. Salah satu silinder dengan bentuk khusus adalah silinder tipe-I. Silinder tipe-I adalah silinder sirkular yang dipotong kedua sisinya parallel terhadap sumbu-y. Oleh karena itu tujuan dari penelitian ini adalah mengetahui karakteristik aliran melintasi empat silinder tipe-I 53 yang tersusun in-lined didekat dinding datar dengan memvariasikan gap antara dinding dengan silinder. Penelitian ini dilakukan dalam sebuah subsonic wind tunnel dengan lebar 660 mm tinggi 660 mm dan panjang 1780 mm. Empat buah silinder tipe-I dengan sudut iris 53o yang terbuat dari PVC digunakan sebagai model dengan diameter D 60 mm.yang dipasang pada test section wind tunnel. Dinding datar yang terbuat dari smooth acrylic dengan tebal 6 mm dan panjang 1200 mm terpasang sejauh 100 mm dari dinding test section wind tunnel. Sisi depan dinding datar diiris dengan sudut iris 30o. Sisi upstream silinder diletakkan 430 mm dari leading edge dinding. Kecepatan freestream dijaga konstan pada 14.312 ms sesuai dengan bilangan Reynolds Re 54x104 yang didasarkan pada diameter silinder dan kecepatan freestream. Jarak in-lined ditetapkan konstan LD4. Jarak antara dinding dengan silinder divariasikan dari 1067 ke 1267. Data Aquisisi dan pressure tranduser digunakan untuk mengukur distribusi tekanan pada silinder dan dinding. Profil kecepatan dibelakang susunan diukur menggunakan Pitot-static tube yang terhubung dengan manometer. Untuk visualisasi aliran digunakan metode surface oil-film picture. Dari penelitian yang telah dilakukan dengan rasio jarak gap 10678804GD88041267 didapatkan bahwa sidewall memberikan blockage effect lemah terhadap aliran yang melintasi empat buah silinder tipe-I 53o. Fenomena yang terjadi pada variasi gap ini adalah aliran pada silinder upstream mulai simetri aliran pada silinder downstream dipengaruhi oleh wake silinder upstream tekanan pada dinding nilai dan serta profil kecepatan dibelakang silinder relative konstan mendekati kondisi centerline.


ABSTRACT

Different studies show that many interesting and unexpected fluid phenomena may occur when bodies are placed one biside the other. Moreover this array of multiple cylinder are also often located near a flat plate and its an interesting topic to be investigated. This kind of study can be applied to many engineering problems such as undersea pipelines building construction and tube in heat exchanger etc. For special shape of bluff body it was proposed a I-type cylinder. The I-type cylinder is a circular cylinder which is cut at both sides in parallel with the-y axis. Hence the aim of this study is to investigate the flow characteristics around four sliced cylinders i-type 53 in-lined arrangement placed a near wall with varying gap between wall and cylinders. The experiments were carried out in a subsonic wind tunnel with test section of 660 mm height 660 mm width and 1780 mm length. Four of I-type cylinders with cutting angle of 53o are made from PVC tube were used as model which has an external diameters D of 60 mm and at two ends of the cylinder spanning the wind tunnel test section. A smooth acrylic flat plate 6 mm in thickness and 1160 mm in length was installed 100 mm above the bottom surface of the test section. The leading edge of the plate was a sharp edge with an angle of 30o. The upstream of cylinders arrangement was located at 430 mm downstream from the leading edge of the flat plate. The free stream velocity in the wind tunnel was constantly maintained at 14312 ms corresponding to Reynolds Number of Re 54 x 10 based on diameter circular cylinders D and the free stream velocity. The center to center spacing between two cylinders was constantly maintained at LD4. The gap distance between the bottom of the cylinders and the flat plate relative to the cylinder diameter GD were varied from 1067 to 1267. An data aquisisi and a pressure tranduser makes possible to measure the pressure distribution around the cylinders and the plane wall. The velocity profiles behind the cylinder was measured using a Pitot-static Tube connected to the pressure tranduser. Surface oil film technique were used to investigate the flow patterns on the cylinders. The result shows that the influence of blockage effect from sidewall to the characteristics of fluid flow pass through four cylinders type I-53 for variation gap ratio 10678804GD88041267 is weak. In this variation gap ratio flow characteristics around cylinders upstream are almost symmetry flow characteristics around cylinders downstream are influenced by wake from cylinders upstream the pressure in sidewall the value of and also the velocity profiles behind the cylinders are close to the value of centerlines condition.



KeywordsSilinder teriris tipe I 53; susunan In-Lined; dinding datar
 
Subject:  Aliran Gas
Contributor
  1. Prof. Dr. Ir. Triyogi Yuwono, DEA
Date Create: 26/07/2011
Type: Text
Format: PDF
Language: Indonesian
Identifier: ITS-Undergraduate-3100011043757
Collection ID: 3100011043757
Call Number: RSM 620.106 4 Okt s


Source
Undergraduate Thesis, Mechanical Engineering, RSM 620.106 4 Okt s, 2011

Coverage
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Copyright @2011 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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  1.  ITS-Undergraduate-16236-abstract_id.pdf - 139 KB
  2.  ITS-Undergraduate-16236-abstract_en.pdf - 136 KB
  3.  ITS-Undergraduate-16236-conclusion.pdf - 307 KB




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