Drift velocity refers to the average velocity of particles, such as bubbles or droplets in a multiphase flow, as they move through a continuous phase under the influence of an external force, typically due to buoyancy or pressure gradients. It plays a crucial role in modeling the interaction between different phases in a flow system, influencing how well the phases mix and transport momentum and energy. Understanding drift velocity is essential for accurately predicting the behavior of mixtures and drift-flux dynamics in various applications.
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