Abstract
Two-phase flow is a flow that is composed of two combined substances, i.e., liquid and gas. Two-phase flow phenomena can be a lot encountered in nature, for example, exhaust gas smoke, fog, rain, cloud, snow, and so forth. Moreover, in the practice of company or industry environment, the flow of the two phases can be encountered on the equipment in the form of heat exchangers, boilers, nuclear reactors, piping systems, geothermal, natural gas liquefaction, and others. Data collection in this research was carried out in 4 stages (from working fluid), namely: air-water, air-water+0% glycerin, air-water+10% glycerin, air-water+20% glycerin, and air-water+30% glycerin. The research aims to determine the void fraction by using the method of digital image processing with the software MATLAB R2014a. Based on the research results, it was obtained that when superficial gas velocity high then, the value of the void fraction obtained will increase, otherwise the higher speed of the superficial liquid then, the value of void fraction that is retrieved will decrease. The viscosity of the fluid very influenced the flow pattern bubbly and plug. It is because the higher the viscosity of fluid flow pattern speed then, the bubbly and the plug will increasingly decline, instead of getting down viscosity makes bubbly flow pattern speed, and the plug will progressively increase. The length of the bubbly and plug pattern is affected by the increasing value of homogeneous (β). As a consequence, the length of the pattern increases. In the frequency when the bubbly and plug occurred, it was obtained a high enough rate that led to the value of the void fraction generated considerable increases.Keyword: two-phase, fluid, void fraction, viscosity, flow pattern.
Highlights
In the practice of company or industry environment, two-phase flow can be encountered in equipment in the form of heat exchangers, boilers, nuclear reactors, piping system, geothermal, natural gas liquefaction, and others, Wallis (1969)
The examples for the application of two-phase flow are flow patterns found in the human body, for instance, are blood vessels that flow in the human body
The data of D = 250 μm is quite different from the homogeneous flow model, but it is appropriate to the correlation proposed earlier by Ali et al, (1993) i.e., two-phase flow in narrow square channel pipe with Dh ~ 1 mm: α = 0,8 β and β = JG / JL which is known as volumetric quality
Summary
In the practice of company or industry environment, two-phase flow can be encountered in equipment in the form of heat exchangers, boilers, nuclear reactors, piping system, geothermal, natural gas liquefaction, and others, Wallis (1969). The analysis on void fraction was done by determining the value of liquid film thickness that encircling the bubbly — the relationship between film thickness and gas superficial velocity (JG) of streamflow in the horizontal pipe with a diameter of 1 mm, 2.4 mm, 4.9 mm and 9mm. The data of D = 250 μm is quite different from the homogeneous flow model, but it is appropriate to the correlation proposed earlier by Ali et al, (1993) i.e., two-phase flow in narrow square channel pipe with Dh ~ 1 mm: α = 0,8 β and β = JG / JL which is known as volumetric quality. The result indicated that the increase of JG was affecting the void fraction except when JG was in its lowest number This phenomenon was because when JG is low, bubble and plug flow pattern were the flow pattern that has occurred. The experiment was carried out with the superficial gas velocity (JG) interval of 0.025 – 66.3 m/s, and the liquid superficial velocity (JL) interval of 0.033 – 4.935 m/s
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