What is the term for the drawing in and transporting of solid particles or gases by the flow of a fluid?

The term that describes the process of drawing in and transporting solid particles or gases by the flow of a fluid is specifically known as entrainment. This phenomenon is observed in fluid dynamics and occurs when fluid flow incorporates additional materials, such as dust, smoke, or other particulates. In fire science, understanding entrainment is crucial as it can influence fire behavior and smoke movement. For instance, when smoke rises from a fire, it can carry heat and particulates upward due to the flow of air. This process plays a significant role in how fire spreads and how smoke propagation can affect visibility and toxic exposure in a structure.

Other terms such as flow path, convection, and conduction refer to different processes. Flow path relates to the course taken by a fluid, convection describes the transfer of heat through fluid motion, and conduction refers to heat transfer through direct contact of materials, which does not involve fluid movement. Recognizing these distinctions is essential in the context of fire behavior and the dynamics of fluid interactions in different scenarios.