Two-phase flow

In fluid mechanics, two-phase flow is a flow of gas and liquid usually in a pipe. Two-phase flow is a particular example of multiphase flow. Two-phase flow can occur in various forms. For example, there are transient flows with a transition from pure liquid to a vapor flow as a result of external heating, separated flows and dispersed two-phase flows where one phase is present in the form of particles, droplets, or bubbles in a continuous carrier phase (i.e. gas or liquid).