Karakteristik aliran dua fase (gas-cam) searah vertikal ke atas dalam saluran berdiameter satu inci Characteristic of Vertically Upwards Cocurrent Two-Phase (liquid-Gas) Flow in a Pipe of One Inchi Diameter

ABSTRACT The objectives of this research were to obtain the visualization of the flow, pressure drop, andempirical equation of pressure drop at each flow pattern, gas slug velocity, and flow pattern map. The test was conducted at constant liquid velocity and variable gas velocity, at constant gas velocity and variable liquid velocity, and at constant velocity of both liquid and gas flow (changing simultaneously) conditions. The research was conducted by using a transparant pipe (plexiglass) with the diameter of 24 mm, and air and water liquid as working fluid The flow pattern was observed at liquid velocity of 0,14 m/s to 1,40 m/s, and air velocity of 0,114 m/s to 2,680 m/s. The experiment was conducted at air pressure of 1 atm and temperature of 20° C. The result of the research shows that the change of air and water flow velocity influence on the pressure drop and flow pattern. The result of the observation is satisfactory with the Sekoguchi flow pattern map, and air slug velocity with Nikline equation. Keywords : Two-phase flow (liquid-gas), vertical cocurrent flow, flow in pipe, flow characterization