INVESTIGASI FRAKSI HAMPA ALIRAN DUA – FASE UDARA – LARUTAN MINYAK KELAPA DAN AQUADES DENGAN KEMIRINGAN 60° PADA PIPA KAPILER HORIZONTAL

Two-phase flow is part of the simplest multi-phase flow. The utilization of twophase flow can be found in everyday life, in the industrial world such as evaporators, and condensers, and in medicine such as the human circulatory system. The thing that is very important to know in such applications is the type of flow pattern that can cause the pressure to rise significantly. So it will cause damage to the piping system or death if it occurs in blood vessels. The type of flow pattern is strongly influenced by the hollow fraction, therefore it is very important to conduct a study aimed at determining the characteristics of the hollow fraction value in the two-phase flow pattern of air-equates-oil emulsion solution in capillary pipes with a slope of 60°. It is important to know the effect of equates-oil emulsion concentrations of 350 mg/ dl and 500 mg/dl on their hollow fractions. This study used a test section in the form of a glass pipe with a diameter of 1.6 mm with a slope position of 60° to the horizontal and used a mixture of coconut oilequates oil emulsions of 350 mg/dl and 500 mg/dl as a liquid phase that presents cholesterol and gas fluids using dry air from the compressor to present oxygen in the human circulatory system. The superficial velocity of the gas (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. The flow pattern is obtained from a high-speed video recording captured using the image processing method. In addition, a hollow fraction is obtained using Matlab R2014a software. In this study, the plug flow pattern obtained a hollow fraction value of 1 at a concentration of 350 mg/dl and 500 mg/dl, and the churn flow pattern in the study obtained a hollow fraction value at a concentration of 350 mg/dl of 0.42 and a concentration of 500 mg/dl a hollow fraction value of 0.54. This study found bubbly flow patterns because those flow patterns are strongly affected by the viscosity of the liquid as well as the superficial velocity of the gas. So that the variable velocity and superficial velocity of the gas have a large role in the hollow fraction and flow pattern that occurs. That plug and churn flow pattern is highly avoided because it can cause flow clogging.