Abstract

Two-phase flow is used in many industries such as nuclear reactors, boilers, condensers, liquefactions of natural gas, etc. Two-phase flow is a flow in a pipe which has two states of fluid such as solid-liquid, liquid-gas, gas-solid. In a two-phase flow, there are three channels, namely vertical, horizontal and inclined channels. In the horizontal channel, the most widely found flow is the flow patterns of stratified flow, bubble flow, plug flow, stratified wavy flow, annular flow, and slug flow. Refer to the previous research above, the flow patterns were mostly obtained by using an experimental study. The advantage of using the simulation is the ability to predict the flow pattern and pressure gradient before doing the experimental study so it can be known earlier if it will have an insecure flow pattern, i.e. slug flow. This research was conducted to find the flow pattern and pressure gradient by using a Computational Fluid Dynamics (CFD) software, the Ansys Fluent 19.0 Student. The model which was used is the Volume of Fluid (VOF) with the fluid of air-water and glycerin (40%-70%). The length of the pipe was 200 mm, the inner diameter was 1.6 mm, and the length of the test section was 100 mm. Liquid superficial speeds (J L ) of 0.033 m/s; 0.149 m/s; 0.232 m/s; 0.539 m/s; 0.7 m/s; 2.297 m/s and 4.935 m/s were used, while the air superficial speed (J G ) was 9.62 m/s. The result of the simulation showed slug annular and churn flow patterns. Slug annular was formed at J L = 0.033 m/s; 0.149 m/s and 0.232 m/s with the glycerin content of 40% and 50%. Slug annular pattern was formed when the glycerin content was 60% and 70% with J L = 0.539 m/s. Viscosity affects the flow pattern, the higher the glycerin content, the higher the viscosity and the more fluid than air. The higher the J L and glycerin content, the higher the pressure gradient.

Highlights

  • Two-phase flow is used in many industries such as a nuclear reactors, boilers, condensers, liquefactions of natural gas, etc

  • Two-phase flow is a flow in a pipe which has two states of fluid such as solid-liquid, liquid-gas, and gassolid

  • We summarize the main contributions of the research that the flow pattern is the slug annular and churns

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Summary

INTRODUCTION

Two-phase flow is used in many industries such as a nuclear reactors, boilers, condensers, liquefactions of natural gas, etc. The study used experimental method while this study used the CFD simulation method which had never been used before They conducted research about the characteristics of the pressure gradient in the two-phase flow of air-liquid mixture and 20% glycerin in a mini horizontal pipe. Wibowo et al (2015) researched the experimental study about the subs of the stratified flow pattern of two phases flowing in the same direction based on the fluctuations of the pressure difference in a horizontal pipe. Based on the previous researches above, the flow patterns were mostly obtained by using experimental study, and the flow patterns mostly are stratified, plug, slug, annular and bubble. This research studied the flow pattern of airwater and glycerin (40%-70%) in a horizontal capillary pipe using a CFD simulation method of the Volume of Fluid (VOF).

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