Visualization and pressure distribution of gas-liquid flow in ¾ inch plexyglass pipe diameter with the slope orientation upward, horizontal and downwardDewi Puspitasari, Marwan Marwani, Ichsan Ramdani and Ridho Mardhan HadiMATEC Web Conf., 101 (2017) 03008DOI: https://doi.org/10.1051/matecconf/201710103008