Abstract
The effect of initial flow velocities on the liquid film thickness in micro-channel accelerated slug flow under adiabatic condition is experimentally investigated. Laser focus displacement meter was used to measure the liquid film thickness. Distilled water was used as a working fluid. Circular tube with inner diameter of 1 mm and length of 500 mm was used. The effects of the initial steady flow velocities, acceleration, and axial distance were evaluated. As the initial flow velocity increases, the liquid film thickness slightly increases at the constant acceleration and axial distance. The experimentally obtained results were compared to the previous correlation in which initial flow velocity is not considered. For each Bo, the liquid film thickness at small axial distance is deviated from the correlation which becomes large with increasing initial flow velocity. At large Z, the correlation well predicts the liquid film thickness which means that the effect of initial flow velocity is negligible at large Z. Also the deviation becomes significant with increasing Bo. The effect of initial flow velocity should be considered in low Bo and Z.
