It also works on Bernoulli’s principle as the Orifice meter and Venturimeter.Let us discuss more details on the Pitot tube, how it works and how we can find the Flow Velocity Equation of a fluid flowing through a pipe with help of the Pitot Tube. This equation can be rearranged and used to solve for fluid velocity or difference in height of the fluids in the manometer: A Pitot tube is a measuring instrument used to determine the velocity of the fluid in a pipe or a channel. The easiest way to determine Flow Velocity is to measure the Velocity Pressure in the duct with a Pitot Tube Assembly connected to a differential pressure. The equation for the difference in pressure in a manometer is substituted into the simplified Bernoulli equation: Thus we obtain the simplified form of Bernoulli's equation: The two points that are being evaluated are at the same height, so and drop out. All terms on the right side refer to point 2, a point upstream from the pitot tube. After you measure static pressure by some other instrument like a barometer, you can compute dynamic pressure, and the flow velocity using this calculator. A Pitot tube metering instrument is measuring stagnation pressure in one point of a streamline. In this simulation, stagnation pressure is measured with a. You can use the calculator for Pitot tube as well. By multiplying the calculated flow velocity by 0. Measurements were taken in the same method as for the pitot tube velocity meter and compared to the velocity at that point. The slit tube was placed vertically with the slit facing upstream. Bernoulli's equation is used to calculate the velocity of the bulk fluid in the pipe by using this pressure difference in the pitot tube:Īll terms on the left side represent the stagnation point (entrance of the pitot tube) here is the stagnation pressure and is the velocity of fluid in the pipe at point 1. A pitot tube determines the velocity of a fluid by measuring the fluids stagnation pressure. In addition, the same experiment was conducted using a pitot tube with a slit. Some kinetic energy density of the fluid flowing through the pipe is converted into pressure, resulting in a change in manometer height. Pitot tubes are used to measure the velocity of a fluid moving through a pipe by taking advantage of the fact that the velocity at the height of the bend in the tube (stagnation point) is zero.

Calculate velocity using a pitot tube