| dc.description.abstract | Void fraction is an important parameter in two-phase flow. In the present work, the adiabatic two-phase airwater
flow void fraction in a horizontal minichannel has been studied experimentally. A transparent circular channel with
1.6 mm inner diameter was employed as the test section. Superficial gas and liquid velocities were varied in the range of
0.025 - 66.3 m/s and 0.033 - 4.935 m/s, respectively. Void fraction data were obtained by analyzing the flow images being
captured by using a high-speed camera. Here, the homogeneous (E and the measured void fractions (H , respectively, were
compared to the existing correlations. It was found that: (1) for the bubbly and slug flows, the void fractions increases with
the increase of JG, (2) for churn, slug-annular, and annular flow patterns, there is no specific correlation between JG and
void fraction was observed due to effect of the slip between gas and liquid, and (3) whilst for bubbly and slug flows the
void fractions are close to homogeneous line, for churn, annular, and slug-annular flows are far below the homogeneous
line. It indicates that the slip ratios for the second group of flow patterns are higher than unity. | |
