Abstract
A two-phase flow pattern experiment on the condensation event of steam flow with external cooling based on the measurement of pressure difference within a horizontal pipe is carried out by varying the superficial velocity. Annulus pipes with inner pipe material made of copper and outer pipe made of galvanized iron (GIP) within an insulation of 10 mm thick were used in this experiment. The length of the pipe is 1.6 meters, outer diameter of 4 inch and inner diameter of 17 mm. The two-phase flow pattern was investigated based on differential pressure fluctuations between the inlet and outlet. To support the observation, flow pattern visualization was performed using a transparent pipe with a diameter of ¾ inch and a length of 1.3 meters connected to the test pipe section. The superficial vapor velocity was carried out from JG = 0.0689 m/s to JG = 1,9117 m/s. The results showed stratified flow patterns for the lowest superficial velocity and also obtained wavy, wavy-slug, and slug. Annular flow patterns can not be observed in this experiment. In general, increasing superficial velocity of steam will cause a significant increase in pressure fluctuations.
Highlights
A two-phase flow pattern experiment on the condensation event of steam flow with external cooling based on the measurement of pressure difference within a horizontal pipe is carried out by varying the superficial velocity
The two-phase flow pattern was investigated based on differential pressure fluctuations between the inlet and outlet
The results showed stratified flow patterns for the lowest superficial velocity and obtained wavy, wavy-slug, and slug
Summary
Bahan penelitian ini adalah aquades, digunakan sebagai bahan penghasil uap air yang akan dikondensasikan untuk membentuk aliran dua fase pada pipa horisontal yang dipanaskan dengan menggunakan boiler, dan air yang digunakan sebagai pendingin pada pipa anulus bagian luar. Pipa kaca dengan diameter 17 mm dan panjang 1,2 m digunakan untuk mengetahui visualisasi pola aliran dua fase yang terjadi. Proses kalibrasi/penyetaraan ini berfungsi untuk mengetahui apakah debit uap yang ditunjukkan oleh tinggi kolom air manometer orifice nilainya tepat atau tidak. Dari Gambar 6 dapat dilihat bahwa hubungan antara debit uap/udara (Quap/udara) dengan beda tekanan orifice (Δhorfc)mempunyai hubungan kuadratis dengan persamaan: Quap/udara= -0,0027 Δhorfc2 + 0,0097 Δhorfc Dengan derajar ketelitian R2 = 0,9838 atau 98,38%
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