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ITS » Undergraduate Theses » Teknik Mesin
Posted by reini@its.ac.id at 24/11/2011 13:59:47  •  1059 Views


STUDI EKSPERIMENTAL KARAKTERISTIK ALIRAN MELINTASI EMPAT SILINDER TERIRIS TIPE-I 53 TERSUSUN SECARA IN-LINED DENGAN JARAK ANTAR SILINDER LD4 DI DEKAT DINDING DATAR STUDI KASUS UNTUK PENGARUH JARAK GAP 0 8804 GD 8804 02

EXPERIMENTAL STUDY OF FLOW CHARACTERISTIC PASSING THROUGH FOUR I-TYPE SLICED CYLINDERS 53 WITH IN-LINED ARRANGEMENT AND IN-LINED DISTANCE LD4 NEAR SIDE WALL CASE STUDY FOR GAP RATIO CYLINDER TO SIDE WALL 08804 GD 880402

Author :
STEVANUS, WILLY  ( 2107100170 )




ABSTRAK

Berbagai penelitian menunjukkan banyak hal yang menarik mengenai fenomena fluida ketika beberapa bodi diletakkan berdekatan. Dua silinder sirkular yang tersusun secara transversal merupakan salah satu contoh yang mudah dari sebuah susunan multistruktur dan akan menjadi bahasan yang menarik jika susunan tersebut diletakkan di dekat dinding datar. Aplikasi dari penelitian ini pada dunia teknik salah satunya adalah konfigurasi shell and tube pada heat exchange. Penelitian ini masih perlu pengembangan studi lebih lanjut terutama untuk bluff body dengan bentuk khusus yang diletakkan didekat dinding datar. 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 yang tersusun secara in-lined didekat dinding datar. Pada penelitian ini digunakan empat buah silinder teriris tipe-I 53. Hal ini ditujukan untuk mempelajari aliran fluida 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 silinder tipe-I dengan sudut iris 53 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 60 mm dan panjang 1200 mm terpasang sejauh 100 mm dari dinding test section wind tunnel. Sisi depan dinding datar diiris dengan sudut iris 30o. Kecepatan freestream dijaga konstan pada 14166 ms sesuai dengan bilangan Reynolds Re 54x104 yang didasarkan pada diameter silinder dan kecepatan freestream. Jarak antar silinder ditetapkan konstan LD4. Jarak antara dinding dengan silinder divariasikan dari 0 ke 02 dengan kenaikan 0067. Pressure Transducer digunakan untuk mengukur distribusi tekanan pada silinder dan dinding. Profil kecepatan dibelakang susunan diukur menggunakan Pitot-static tube yang terhubung dengan pressure transducer. Untuk visualisasi aliran digunakan metode surface oil-film. Dari penelitian yang telah dilakukan dengan rasio jarak gap 0 8804GD8804 02 menunjukkan bahwa sidewall memberikan pengaruh yang sangat besar terhadap karakteristik aliran yang mengalir melalui susunan silinder teriris tipe-I 53 yang disusun secara in-lined. Terjadinya bubble separation pada silinder II lebih dipengaruhi oleh keberadaan sidewall karena memberikan blockage effect yang besar pada silinder I yang berada side-by-side dengan silinder II.


ABSTRACT

Different studies show that many interesting and unexpected fluid phenomena may occur when bodies are placed one beside the other and grouping effect of bodies is a very interesting subject of fundamental research in fluid mechanics. Two circular cylinders in transversal arrangement is a simple case of an array of multiple structures. Moreover this array of multiple circular 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 tube in heat exchanger etc. There are certainly the larger the number of studies on the flow around a bluff body of various shape located near a plane wall especially for a bluff body with a special shape. 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 I-type cylinders in in-lined arrangement placed near a plane wall. This study on the relatively simple case of four stationary I-type cylinders of equal diameters in in-lined arrangement with constant spacing are placed near a plane wall. 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 I-type cylinders with cutting angle of 53 which are made from PVC tube were used as model. The cylinder have an external diameters D of 60 mm. A smooth acrylic flat plate 6 mm in thickness and 1200 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 30. The free stream velocity in the wind tunnel was constantly maintained at 14166 ms corresponding to Reynolds Number of Re 54 x 104 based on diameter circular cylinders D and the free stream velocity. The in-lined distance between four 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 0 to 02 with increment 0067. Pressure transducers are used to measure coefficient of pressure of sidewall and cylinders. The velocity profiles behind the cylinders was measured using a Pitot-static Tube connected to pressure transducers. Surface oil film technique were used to investigate the flow patterns on the cylinders. The result for the gap distance ratio 0 8804GD8804 02 shows that sidewall effect gives big effect on the flow characteristic through I-type cylinder 53 with in-lined arrangement. Bubble separation occured on second cylinder caused by sidewall effect because it gives huge blockage effect on first cylinder that exists side-by-side with second cylinder.



KeywordsI-type cylinder;in-lined arrangement;near a plane wall
 
Subject:  Aliran Gas
Contributor
  1. Prof. Dr. Ir. Triyogi Yuwono, DEA
Date Create: 08/07/2011
Type: Text
Format: PDF
Language: Indonesian
Identifier: ITS-Undergraduate-3100011043903
Collection ID: 3100011043903
Call Number: RSM 620.106 4 Ste s


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

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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-16240-abstract_id.pdf - 262 KB
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  3.  ITS-Undergraduate-16240-conclusion.pdf - 317 KB




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