Void Fraction Features Using Image Processing on a Clear Capillary Pipe with a 45° Slope to The Horizontal Line of Two-Phase Air-Liquid Flow with High Viscosity

Abstract

In supercomputer equipment, X-rays, satellite cryogenic cooling systems, and others, the two-phase flow phenomenon in mini channels are also used. A significant issue for them is the void fraction function induced by superficial velocity, fluid viscosity, and slope. This analysis's objective was to determine the characteristics of void fraction values on the bubble, plug, slug-annular, annular, churn in horizontal capillary pipes. The research was carried out on a mini-pipe with a diameter of 1.6 mm and a length of 130 mm, mounted at a horizontal angle of 45 degrees. A mixture of 40, 50, 60, and 70 percent air-pure water and glycerin concentrations is the fluid used. The flow pattern video was shot using a Nikon J4 camera with a speed of 1200 fps, gas speed (JG) at 2.5x10-2-66.3 m/s intervals, and fluid velocity (JL) at 3.3x10-2 - 4.935 m/s intervals. A digital image processing technique is used to calculate the value of a void fraction with the MATLAB R2014a and Microsoft Excel application software. This paper's new finding is that the value of the void fraction for bubbly flow indicates conditions that are not so stable and have a low value. The void fraction for plug flow tends to be close to 1 over a certain period; this is induced by the air cavity that almost fills the vessel, as shown by the effects of the image processing and the graphs the time series of voids. The void fraction has a value that fluctuates to a moderate value in the churn flow pattern.

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