Questions about orifice plate flow meters
Thread Content
The flow velocity at the flared outlet of the orifice plate is lower than that at the inlet. Then why is its pressure also lower than that at the inlet? I can’t understand mass conservation and Bernoulli’s principle. Seeking advice from someone knowledgeable
Find a measuring instrument and study it carefully.
When fluid flowing in a pipe encounters an orifice plate (which creates resistance), a pressure difference is generated on both sides of the orifice plate. The greater the flow rate and the faster the velocity of the fluid, the larger the pressure difference that occurs. It is this principle that is utilized to measure flow rate. In the direction of fluid flow, the root area at the front of the orifice plate is under positive pressure, while the root area on the outlet side of the orifice plate is under negative pressure. The faster the flow rate, the greater the negative pressure generated at this location.
The flow velocity at the outlet of the trumpet increases, kinetic energy rises, potential energy decreases, and the static pressure is lower than that at the inlet.