Safi'i, Impron (2007) Study Eksperimental Karakteristik Lapisan Batas Turbulen Pada Pelat Datar Dengan Alur Bujursangkar. Other thesis, Institut Teknologi Sepuluh Nopember.
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2102100095-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (43MB) |
Abstract
Turbulent boundary layer selalu menjadi topik yang menarik untuk dikaji. Pada penelitian kali ini, karakteristik yang dikaji adalah aliran turbulen melintasi pelat datar dengan satu alur bujur sangkar. Penelitian ini bertujuan untuk mengetahui pengaruh alur bujursangkar tunggal terhadap karakteristik boundary layer yaitu : mean velocity profile (u), skin friction coefficient (C;) dan velocity shape factor (H) dari boundary layer yang melewati pelat datar dengan alur bujursangkar serta koefisien tekanan (Cp) di dalam alur bujursangkar. Studi eksperimen ini dilakukan di subsonic wind tunnel. Variasi yang dilakukan adalah Reynolds number yaitu pada Reo = 710 dan Re0 = 13 70. Pengukuran kecepatan aliran fluida yang melalui permukaan pelat datar dengan satu alur bujur sangkar menggunakan stagnation pressure tube. Titik pengukuran yang diambil ke arah horizontal pada pelat datar, dimana pengambilan data dilakukan pada daerah upstream, diatas alur dan downstream alur. 5 titik pada upstream dengan jarak 2 mm, 3 titik diatas alur dan pada downstream dilakukan pengambilan data sebanyak 16 titik. 16 titik tersebut adalah 6 titik dengan jarak 2 mm, 5 titik dengan jarak 3 mm dan sisanya dilakukan pada jarak 5 mm. Untuk pengukuran pada tempat tersebut diambil 34 titik dimulai dari ketinggian 0,35 mm sampai tebal boundary layer diatas permukaan pel at, dimana jarak antar titik pengukuran semakin besar untuk titik pengambilan yang semakin jauh dari permukaan pelat. Hasil yang diperoleh dari penelitian ini adalah kenaikan CD total pada pelat datar dengan alur sebesar 51,78% pada Re8 = 7 I 0 dan 28, I 6 % pada Re8 = I 370 dibandingkan CD total pada pelat datar tanpa alur. Adanya alur pada pelat datar menyebabkan perubahan karakteristik boundary layer turbulen, dimana momentum thickness (B) dan displacement thickness (J*) terganggu dan tidak berkembang secara kontinyu. Intensitas turbulensi yang melewati pelat datar dengan alur maupun tanpa alur cenderung konstan. Visualisasi aliran menggunakan metode oil flow picture diperoleh adanya low speed streak
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Turbulent boundary layer has always been an interesting topic to study. In this study, the characteristics studied are turbulent flow across a flat plate with a single square groove. This study aims to determine the effect of a single square groove on the boundary layer characteristics, namely: mean velocity profile (u), skin friction coefficient (C;) and velocity shape factor (H) of the boundary layer passing through a flat plate with a square groove and the pressure coefficient (Cp) in the square groove. This experimental study was conducted in a subsonic wind tunnel. The variations carried out were the Reynolds number, namely at Reo = 710 and Re0 = 13 70. Measurement of fluid flow velocity through the surface of a flat plate with a single square groove using a stagnation pressure tube. The measurement points were taken in a horizontal direction on the flat plate, where data collection was carried out in the upstream area, above the groove and downstream of the groove. 5 points on the upstream with a distance of 2 mm, 3 points above the groove and on the downstream were taken as many as 16 data points. The 16 points are 6 points with a distance of 2 mm, 5 points with a distance of 3 mm and the rest are done at a distance of 5 mm. For measurements at that location, 34 points were taken starting from a height of 0.35 mm to the thickness of the boundary layer above the plate surface, where the distance between measurement points is greater for the points taken further from the plate surface. The results obtained from this study are an increase in the total CD on a flat plate with grooves of 51.78% at Re8 = 7 I 0 and 28.1 6% at Re8 = I 370 compared to the total CD on a flat plate without grooves. The presence of grooves on a flat plate causes changes in the characteristics of the turbulent boundary layer, where the momentum thickness (B) and displacement thickness (J *) are disturbed and do not develop continuously. The intensity of turbulence passing through a flat plate with grooves or without grooves tends to be constant. Flow visualization using the oil flow picture method obtained a low speed streak
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSM 620.106 4 Imp s-1 2007 (weeding) |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | EKO BUDI RAHARJO |
| Date Deposited: | 21 Oct 2025 06:44 |
| Last Modified: | 21 Oct 2025 06:46 |
| URI: | http://repository.its.ac.id/id/eprint/128644 |
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