A multiphase flow regime in near-vertical pipes in which large slugs of gas move up the center of the pipe, usually carrying small droplets of oil or water with them. Most of the remaining oil or water flows up along the pipe walls. The flow is relatively chaotic, producing a frothy mixture containing some large, elongated bubbles. Neither phase is continuous. Froth flow occurs at relatively high gas velocity and is similar to churn flow. As the gas velocity increases, it changes into annular flow.