The difference in level between the liquid in the tube and the free surface becomes the measure of dynamic pressure. The differential pressure is measured between both the pressures gives the dynamic pressure.
There is another chamber within the pitot tube filled with fluid with static pressure. The fluid flowing through the pipeline enters the pitot tube and rest there. fig: 3Ī pitot tube is a simple round cylinder with one end opened with a small hole and other end enclosed. The pitot-static tube that having the static pressure inlet is shown below. The axis of tube measuring the static pressure should be perpendicular to the boundary and free from burrs so that the boundary is smooth. fig:1įor a simple pitot tube (shown in fig:1) we should arrange one another pressure sensing element to measure the static pressure. The fluid enters through the impact hole and there can one or two other holes in the pitot tube, which are the static pressure source. The pitot meter consists of a tube pointing directly toward the flow. Where K is a constant, pS is the static pressure, and pI is the impact pressure. In a pitot-static tube, the flow Q is given by: The flow rate, like other devices, is calculated from the square root extractor of the pressure. The difference between the two measurements gives a value for dynamic pressure. The pitot tube installed in the flow stream measures the direct pressure at the contact pitot tube hole and a second measurement is required, being of static pressure. The pitot tube is a differential pressure measuring device. Pitot tube measures the pressure point in contact. It is widely to measure the airspeed of aircrafts, speedboat speed and for fluid flow measurement in industrial application.
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