Application of μ-PIV for investigating liquid film characteristics in an open inclined microchannel

► We examine the possibility of using a μ-PIV system for investigating the hydrodynamic characteristics of thin liquid films. ► We give data concerning liquid film thickness for various flow rates. ► The data collected was also used for reconstructing the corresponding shape of the interface. ► It was verified that the correlations used in the macroscale are not valid in the microscale. ► It was proved that μ-PIV is suitable for assessing liquid film characteristics in micro-channels.