![]() Velocity profiles of fluid movement describe the spatial distribution of instantaneous velocity vectors across a given cross section. Turbulent flow exhibits a flat velocity profile. Laminar flow occurs when air can flow smoothly, and exhibits a parabolic velocity profile turbulent flow occurs when there is an irregularity (such as a disruption in the surface across which the fluid is flowing), which alters the direction of movement. Like any fluid, air may exhibit both laminar and turbulent flow patterns. The flow of air can be induced through mechanical means (such as by operating an electric or manual fan) or can take place passively, as a function of pressure differentials present in the environment. What relates both forms of description is the air density, which is a function of pressure and temperature through the ideal gas law. It can be described as a volumetric flow rate (volume of air per unit time) or a mass flow rate (mass of air per unit time). In engineering, airflow is a measurement of the amount of air per unit of time that flows through a particular device. Atmospheric air pressure is directly related to altitude, temperature, and composition. Air behaves in a fluid manner, meaning particles naturally flow from areas of higher pressure to those where the pressure is lower. The primary cause of airflow is the existence of air. For the automobile, see Chrysler Airflow.Īirflow, or air flow, is the movement of air.
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