Studi Numerik Pengaruh Sudut Ekspansi Pada Aliran Internal Terekspansi Dengan Variasi Bilangan Reynolds dan Sudut Ekspansi

Fahreza, Muhammad Rafif (2025) Studi Numerik Pengaruh Sudut Ekspansi Pada Aliran Internal Terekspansi Dengan Variasi Bilangan Reynolds dan Sudut Ekspansi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Perubahan mendadak pada penampang pipa (sudden expansion) merupakan salah satu faktor yang mempengaruhi kinerja sistem perpipaan, terutama dalam menghasilkan kerugian tekanan (pressure losses). Penelitian ini bertujuan untuk mengkaji pengaruh sudut ekspansi dan variasi bilangan Reynolds terhadap karakteristik aliran pada pipa dengan sudden expansion. Penelitian dilakukan menggunakan simulasi numerik dengan metode Computational Fluid Dynamics (CFD) melalui software ANSYS 2024 R1. Model aliran dianalisis menggunakan pendekatan 2D aksimetrik dengan variasi sudut ekspansi dan bilangan Reynolds yang relevan. Parameter utama yang ditinjau meliputi pressure drop, koefisien kerugian (loss coefficient), perubahan profil kecepatan, serta distribusi tekanan di sepanjang pipa.. Variasi sudut ekspansi yang akan diteliti mencakup 90°, 75°, 60°, dan 45°, yang dipilih untuk memberikan gambaran menyeluruh tentang dampak geometri pipa terhadap aliran fluida dengan variasi bilangan Red = 6×104, 1.2×105, 2×105, 3.×105. Berdasarkan studi numerik didapatkan hasil berupa parameter loss coefficient, coefficient of pressure, perubahan profil kecepatan, kontur kecepatan, kontur tekanan, dan vektor kecepatan. Hasil diperoleh bahwa semakin besar sudut expansion maka semakin besar pula nilai
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A sudden change in the pipe cross-section (sudden expansion) is one of the factors that affect the performance of piping systems, particularly in generating pressure losses. This study aims to examine the effect of the expansion angle and variations in Reynolds number on the flow characteristics in pipes with sudden expansion. The research was conducted using numerical simulations with the Computational Fluid Dynamics (CFD) method through ANSYS 2024 R1 software. The flow model was analyzed using a 2D axisymmetric approach with variations in expansion angles and relevant Reynolds numbers. The main parameters reviewed include pressure drop, loss coefficient, changes in velocity profiles, and pressure
distribution along the pipe. The variations in expansion angles to be studied include 90°, 75°, 60°, and 45°, chosen to provide a comprehensive overview of the impact of pipe geometry on fluid flow with variations in Reynolds number Red = 6×104 , 1.2×105 , 2×105 , 3.×105 Based on numerical studies, results were obtained regarding loss coefficient parameters, pressure coefficients, changes in velocity profiles, velocity contours, pressure contours, and velocity vectors. The results indicated that as the expansion angle increases, the value of K ,KL also increases. As the Reynolds number increases, the value of KL KL and pressure oefficient (Cp) decreases. The largest value of KLKL occurs at an angle of 90° with a Reynolds number of 6×104 . At larger expansion angles, the flow is forced to maintain a more constant velocity compared to smaller expansion angles. Visualization of velocity contours in the gradual expansion model with variations in expansion angles and Reynolds numbers can provide information on how much reduction occurs in the wake region. Velocity vectors can explain the phenomenon of flow separation and vortex formation.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	bilangan Reynolds, pembesaran mendadak, pembesaran tekanan Sudden expansion, pressure drop, loss coefficient, reynolds number
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Rafif Fahreza
Date Deposited:	04 Feb 2025 04:21
Last Modified:	04 Feb 2025 04:21
URI:	http://repository.its.ac.id/id/eprint/118096

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