Which term describes losses caused by changes to air movement and turbulence?

Which term describes losses caused by changes to air movement and turbulence?

• A. Contractions
• B. Friction Losses
• C. Dynamic Losses
• D. Outlet

Answer: (C)

Dynamic losses describe the resistance that arises when the air flow changes velocity or becomes turbulent as it encounters fittings, contractions, expansions, bends, or other disturbances. When air accelerates or decelerates, part of its energy is dissipated as turbulence and eddies, causing a pressure drop. This is different from friction losses, which come from shear along the duct walls as the air slides past them. The term captures losses caused specifically by changes to air movement and turbulence, making it the best fit for describing these effects. Contractions are a type of geometric disturbance that can cause such losses, but they’re not the general term for all instances. An outlet isn’t the mechanism causing these losses.

Dynamic losses describe the resistance that arises when the air flow changes velocity or becomes turbulent as it encounters fittings, contractions, expansions, bends, or other disturbances. When air accelerates or decelerates, part of its energy is dissipated as turbulence and eddies, causing a pressure drop. This is different from friction losses, which come from shear along the duct walls as the air slides past them. The term captures losses caused specifically by changes to air movement and turbulence, making it the best fit for describing these effects. Contractions are a type of geometric disturbance that can cause such losses, but they’re not the general term for all instances. An outlet isn’t the mechanism causing these losses.