Rizal, Muhammad Syamsu (2026) Studi Numerik Pengaruh Konfigurasi Perpipaan Terhadap Pembentukan Gelembung (Bubbling) Pada Sistem Aliran Elektrolit Di Instalasi Perpipaan Refinery Tembaga PT Smelting. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Proses pemurnian tembaga di PT Smelting Gresik sering mengalami kendala pembentukan gelembung (bubbling) pada sistem sirkulasi elektrolitnya. Fenomena ini menyebabkan fluktuasi tekanan, penurunan NPSHa, dan penurunan efisiensi pompa sentrifugal akibat separasi aliran. Oleh karena itu, penelitian ini bertujuan untuk menganalisis secara numerik pengaruh variasi konfigurasi geometri perpipaan terhadap pembentukan gelembung guna menentukan desain instalasi yang paling optimal. Penelitian ini menggunakan metode Computational Fluid Dynamics (CFD) dengan pendekatan Volume of Fluid (VOF) untuk mensimulasikan aliran dua fasa secara steady-state. Proses komputasi meliputi pre-processing berupa pembuatan enam variasi geometri secara spesifik dengan mengubah sudut elbow dari 90° menjadi 135° serta memperbesar diameter pipa outlet pada beberapa variasi beserta meshing. Tahapan selanjutnya adalah processing dengan model turbulensi SST k-ω, serta post-processing guna menganalisis kontur distribusi tekanan, profil kecepatan, dan volume fraction. Hasil simulasi menunjukkan konfigurasi eksisting menghasilkan tingkat bubbling tertinggi dengan volume fraction sebesar 0,0886. Modifikasi menggunakan sudut chamfer terbukti paling efektif meredam pressure drop sistem. Secara keseluruhan, variasi konfigurasi sudut landai (Variasi 4) direkomendasikan sebagai desain paling optimal karena berhasil mereduksi fasa uap secara maksimal dengan nilai fraksi kekosongan terendah sebesar 0,0617, serta mampu menjaga keseimbangan beban hidraulik pada pompa.
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The copper electrorefining process at PT Smelting Gresik frequently encounters bubble formation (bubbling) issues within its electrolyte circulation system. This phenomenon causes pressure fluctuations, a decrease in NPSHa, and a reduction in centrifugal pump efficiency due to flow separation. Therefore, this study aims to numerically analyze the effect of piping geometry configuration variations on bubble formation to determine the most optimal installation design. This research employs the Computational Fluid Dynamics (CFD) method with the Volume of Fluid (VOF) approach to simulate steady-state two-phase flow. The computational process includes pre-processing, which involves creating six geometry variations specifically by changing the elbow angle from 90° to 135° and increasing the outlet pipe diameter in several variations along with meshing. This is followed by the processing stage using the SST k-ω turbulence model, and post-processing to analyze pressure distribution contours, velocity profiles, and volume fractions. Simulation results indicate that the existing configuration generates the highest bubbling level with a volume fraction of 0.0886. Modification using a chamfered angle proved to be the most effective in reducing the system's pressure drop. Overall, the obtuse angle configuration variation (Variation 4) is recommended as the optimal design because it successfully maximizes the reduction of the vapor phase with the lowest void fraction value of 0.0617, while also maintaining the hydraulic load balance on the pumps.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Bubbling, Computational Fluid Dynamics (CFD), pompa sentrifugal |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Muhammad Syamsu Rizal |
| Date Deposited: | 31 Jul 2026 01:42 |
| Last Modified: | 31 Jul 2026 01:42 |
| URI: | http://repository.its.ac.id/id/eprint/140016 |
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