What is motive flow?

What is motive flow?

• A. High-pressure flow through a Venturi-shaped nozzle which creates low pressure as the fluid is ejected
• B. Low-pressure flow around a wing
• C. Thermal flow through exhaust ducts
• D. Electrical flow in a conductor

Answer: (A)

Motive flow is the driving fluid that supplies the energy to move a system, typically a high-pressure stream that is accelerated to create motion. In a Venturi-shaped nozzle, this high-pressure fluid is forced through a constricted throat, speeding up and causing the static pressure to drop. The fast jet produced through this process is the motive flow, converting pressure energy into kinetic energy to generate thrust or propulsion. The other scenarios describe flows that aren’t primarily about driving motion: flow around a wing relates to lift from pressure differences, thermal flow in exhaust ducts concerns heat transfer, and electrical flow is not a fluid.

Motive flow is the driving fluid that supplies the energy to move a system, typically a high-pressure stream that is accelerated to create motion. In a Venturi-shaped nozzle, this high-pressure fluid is forced through a constricted throat, speeding up and causing the static pressure to drop. The fast jet produced through this process is the motive flow, converting pressure energy into kinetic energy to generate thrust or propulsion. The other scenarios describe flows that aren’t primarily about driving motion: flow around a wing relates to lift from pressure differences, thermal flow in exhaust ducts concerns heat transfer, and electrical flow is not a fluid.