The Venturi effect relates the pressure along an enclosed flow (in a pipe) to the flow rate through the pipe. Within this region, there is a pressure drop and a resulting flow rate increase within this section of the pipe. This is illustrated in the graphic below, where the laminar flow in a pipe is being driven by a pressure gradient, and the flow encounters a constricted region along the flow direction. The Venturi effect is a somewhat counterintuitive observation that the rate of laminar fluid flow through an enclosed system, such as a pipe, increases as the fluid encounters a constricted region. Both effects can be derived from the Navier-Stokes equation if desired, or they can be identified in CFD simulations. Taken together, we can explain one of these effects in terms of the other. Bernoulli’s principle is a general statement about conservation of energy in laminar flow. Specifically, we have the Venturi effect arising from conservation of momentum and conservation of mass. The Venturi effect and Bernoulli’s principle are related to each other through conservation laws. Explaining the Venturi Effect With Bernoulli’s Principle In this article, we’ll dig deeper into how these effects arise in CFD simulations and how simulation data can be used with Bernoulli’s principle. The Venturi effect and Bernoulli’s principle are related through fundamental conservation laws (energy, mass, and momentum) that underlie all areas of mechanics and dynamics. The Venturi effect can be explained in terms of another important principle from fluid dynamics, known as Bernoulli’s principle. When heat sink designers create these channels in a heat sink, they are taking advantage of the Venturi effect to encourage higher heat transfer into the surrounding fluid flow. The large posts and fins used in modern heat sinks certainly look interesting, but they have a practical purpose that encourages heat transfer into a nearby flowing fluid within the constricted channels in a heat sink. These channels in this heat sink constrict airflow and cause the Venturi effectĪn important effect from fluid dynamics that is used in heat sink design is the Venturi effect. The Venturi effect and Bernoulli’s equation makes statements about conservation of energy, conservation of momentum, and conservation of mass. This change in fluid flow rate through a channel can be described using Bernoulli’s principle. The Venturi effect describes how the rate of fluid flow in an enclosed system changes as the flow enters a constricted channel.
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