Setyawan, Agus (2010) Studi Eksperimental Tentang Karakteristik Aliran Fluida Melintasi Silinder Teriris Tipe-D 53 Di Dekat Side Wall Untuk Perubahan Tebal Lapis Batas Side Wall. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penelitian aliran eksternal melintasi suatu body telah banyak dilakukan dan terus dikembangkan hingga saat ini. Berbagai variasi untuk mengetahui pengaruh dinding telah dilakukan untuk memperoleh data-data mengenai karakteristik aliran fluida yang terbentuk di sekeliling benda uji. Penelitian ini diaplikasikan pada berbagai bidang industri seperti konstruksi pipa penyangga bangunan lepas pantai, penyusunan shell and tube, jaringan pipa bawah laut, dan berbagai contoh yang lain. Hal tersebut mendasari adanya pemikiran untuk melakukan penelitian tentang karakteristik aliran fluida melintasi silinder teriris tipe-D di dekat dinding datar untuk lapis batas laminer dan turbulen. Penelitian ini dilakukan secara eksperimental dalam sebuah wind tunnel; benda uji yang digunakan adalah silinder serta dinding datar dengan variasi rasio jarak antara silinder dan dinding terhadap diameter silinder ($G/D$) sebesar 0,333; 0,400; 0,467; 0,533; dan 0,600. Silinder yang digunakan adalah silinder yang teriris pada bagian depan (tipe D) dengan sudut iris silinder sebesar $53^\circ$. Sebuah kawat berdiameter 4 mm diletakkan di sisi upstream silinder untuk menciptakan lapis batas turbulen pada test section. Karakteristik aliran fluida yang diteliti adalah distribusi koefisien tekanan ($Cp$), koefisien drag ($CD$), koefisien lift ($CL$), profil kecepatan di belakang silinder, serta melakukan visualisasi menggunakan metode oil flow picture pada open circuit subsonic wind tunnel dengan $Re = 5,3 \times 10^4$. Dari penelitian yang telah dilakukan, didapatkan bahwa silinder yang diletakkan di dekat side wall akan berinteraksi dengan side wall tersebut. Pada jarak gap yang kecil, distribusi koefisien tekanan pada kontur silinder tidak simetris antara upper side dan lower side silinder yang menyebabkan timbulnya gaya lift. Pada rasio jarak gap dengan diameter silinder ($G/D$) yang sama, dinding datar dengan penambahan wire rod lebih mempengaruhi karakteristik aliran fluida yang melintasi silinder bila dibandingkan dengan dinding tanpa penambahan wire rod. Separasi yang terjadi lebih ke belakang sehingga wake di belakang silinder lebih sempit dan gaya drag yang dihasilkan lebih rendah. Kemudian, pengaruh antara silinder dengan side wall semakin berkurang seiring bertambahnya gap.
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Research on external flow through a body has been widely used and further developed until now. Many variations and configurations have been done to observe flow characteristics around the model. This experiment has been applied in industrial development, such as subsea piping, shell and tube configuration in heat exchangers, and others. The purpose of this research was to get fluid flow characteristics around a cylinder near a side wall. This research was done experimentally in a subsonic wind tunnel using a cylinder located near a side wall with gap ratios ($G/D$) of 0,333; 0,400; 0,467; 0,533; and 0,600, using a cylinder that had been cut on the frontal area (Type D) with a cutting angle of $53^\circ$. Turbulence boundary layers were generated by attaching a 4 mm tripping wire on the side wall leading edge. The flow characteristics that were researched included the pressure coefficient distribution ($Cp$), drag coefficient ($CD$), lift coefficient ($CL$), and velocity profile behind the cylinder, along with visualization using the oil flow picture method. This research was conducted in a subsonic wind tunnel with a Reynolds Number ($Re$) of $5,3 \times 10^4$. From the research conducted, it was found that when the cylinder is placed near the side wall, it interacts with the side wall. In a small gap, the pressure coefficient distribution on the contour of the cylinder is not symmetrical between the upper and lower sides of the cylinder, which causes a lift force. At the same gap-to-cylinder-diameter ratio ($G/D$), the flat wall with the addition of a wire rod influences the fluid flow characteristics through the cylinder more significantly when compared to walls without the addition of a wire rod. The separation occurs further downstream, so the wake behind the cylinder is narrower and the resulting drag force is lower. Furthermore, the influence between the cylinder and the side wall diminishes more quickly as the gap increases.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSM 620.106 4 Set s |
| Uncontrolled Keywords: | Silinder teriris tipe-D, dinding datar, rasio jarak gap dengan silinder (G/D), sudut iris (0,), tebal lapis batas (8), koefisien tekanan (C), koefisien drag (Cn), koefisien lift (C₁), D-type cylinder, side wall, ratio of gap between cylinder and side wall to cylinder diameter (G/D), cutting angle (0), boundary layer thickness (δ), pressure coefficient (C), drag coefficient (Co) lift coefficient (Cr). |
| Subjects: | Q Science > QC Physics > QC151 Fluid dynamics |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | magang . |
| Date Deposited: | 21 Sep 2026 08:04 |
| Last Modified: | 21 Sep 2026 08:04 |
| URI: | http://repository.its.ac.id/id/eprint/144747 |
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