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All Journal Semesta Teknika JMPM (Jurnal Material dan Proses Manufaktur)
Sukamta Sukamta
(Scopus ID : 57193948106; h-index : 2), Universitas Muhammadiyah Yogyakarta
Engineering Mechanical Engineering

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Fraksi Hampa Aliran Dua-Fase Udara-Air dan Minyak pada Pipa Kapiler dengan Kemiringan 75 Derajat Terhadap Horisontal Sukamta Sukamta; Fani Nur Hidayat; Sudarja Sudarja; Sri Sundari
Semesta Teknika Vol 25, No 2 (2022): NOVEMBER 2022
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v25i2.16666

Abstract

Parameter cukup berperan dalam kestabilan aliran dua fase pada peralatan mesin adalah fraksi hampa, karena akan berpengaruh pada fluktuasi tekanan dan pola aliran yang terjadi, sehingga dapat membahayakan sistem. Oleh karena itu, penelitian ini bertujuan mendapatkan data primer tentang fraksi hampa yang terjadi pada pipa mini/kapiler khususnya pada kemiringan 75 derajat terhadap horizontal. Penelitian ini menggunakan pipa uji do=1,6 mm dan panjang 160 mm. Fluida kerja berupa udara dan campuran air dengan minyak kelapa konsentrasi 350 mg/dl dan 500 mg/dl. Kecepatan superfisial gas (JG) = 0,08 – 74,6 m/s dan kecepatan superfisial cairan (JL) = 0,04 – 4,15 m/s. Pola aliran diamati menggunakan kamera berkecepatan tinggi, dan olah data menggunakan image processing. Diperolah hasil pola aliran plug, slug-annular, annular, dan churn. Perbedaan konsentrasi fluida tidak berpengaruh secara signifikan terhadap pola aliran dan fraksi hampa, akan tetapi justru tegangan permukaan yang memilki pengaruh cukup besar pada nilai fraksi hampa dan pola aliran.
Air Two-Phase Flow Void Fraction – Water and Oil Emulsion on Mini Pipe with a slope of 600 Against Horizontal Position Sukamta Sukamta
JMPM (Jurnal Material dan Proses Manufaktur) Vol 6, No 2 (2022): Desember
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v6i2.16252

Abstract

The utilization of two-phase or multi-component flow in mini pipes is often found in the industrial world, such as mini evaporators, mini heat exchangers, etc. Multi-component flow can also be found in the biomedical, such as in the human circulatory system through vessels. An important parameter in a two-phase flow is the hollow fraction since this parameter significantly affects the flow pattern, which affects pressure fluctuations. Therefore, this study aims to obtain primary experimental data on the vacuum fraction, specifically in the air flow-water and oil emulsions with concentrations of 350 mg/dl and 500 mg/dl at an inclination of 60o to the horizontal. The study used a glass pipe with a diameter of 1.6 mm and a length of 160 mm. Data were captured using a high-speed camera at a gas superficial velocity (JG) = 0.083 m/s - 74.604 m/s and the superficial velocity of the liquid (JL) = 0.041 m/s - 4.145 m/s, and processed using MATLAB R2014a software.  The results showed that the difference in the concentration of water and oil emulsions significantly affects the void fraction value, thus affecting the flow pattern. This case is because the difference in the concentration of water and oil emulsions affects the viscosity value, ultimately affecting the liquid's superficial velocity. Similarly, the slope of the pipe 60o to the horizontal affects the flow pattern that occurs; this is because the slope of the pipe will cause the influence of gravitational acceleration on the value of the superficial velocity of gases and liquids, although not very significant. The rise and fall of the gas's superficial velocity and the liquid's superficial velocity affect the value of the hollow fraction. More plug, slug-annular, annular, and churn flow patterns were identified than bubbly flow patterns, which is why the hollow fraction increased with the gas's superficial velocity and decreased with low superficial velocity. This kind of flow pattern needs to be watched out for because it has the potential to increase pressure significantly.
Co-Authors Fani Nur Hidayat Sri Sundari Sudarja Sudarja