Bernoulli’s Equation.

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Presentation transcript:

Bernoulli’s Equation

Fluid Dynamics A fluid element changes velocity as it moves from the wider part of a tube to the narrower part. This acceleration of the fluid element must be caused by a force. The fluid element is pushed from both ends by the surrounding fluid, that is, by pressure forces.

Fluid Dynamics To accelerate the fluid element, the pressure must be higher in the wider part of the tube. A pressure gradient is a region where there is a change in pressure from one point in the fluid to another. An ideal fluid accelerates whenever there is a pressure gradient.

Fluid Dynamics The pressure is higher at a point along a stream line where the fluid is moving slower, lower where the fluid is moving faster. This property of fluids was discovered by Daniel Bernoulli and is called the Bernoulli effect. The speed of a fluid can be measured by a Venturi tube.

Applications of the Bernoulli Effect Lift is the upward force on the wing of an airplane that makes flight possible. The wing is designed such that above the wing the air speed increases and the pressure is low. Below the wing, the air is slower and the pressure is high. The high pressure below the wing pushes more strongly than the low pressure from above, causing lift.

Applications of the Bernoulli Effect In a hurricane, roofs are “lifted” off a house by pressure differences. The pressure differences are small but the force is proportional to the area of the roof.

Bernoulli’s Equation We can find a numerical relationship for pressure, height and speed of a fluid by applying conservation of energy: ΔK + ΔU = W As a fluid moves through a tube of varying widths, parts of a segment of fluid will lose energy that the other parts of the fluid will gain.

W = W1 + W2 = p1 ΔV  p 2 ΔV = (p1  p 2) ΔV Bernoulli’s Equation The net work done on the system is: W = W1 + W2 = p1 ΔV  p 2 ΔV = (p1  p 2) ΔV We combine the equations for kinetic energy, potential energy, and work done: Rearranged, this equation is Bernoulli’s equation, which relates ideal-fluid quantities at two points along a streamline: