Fully developed flow past an orifice plate refers to the steady flow of a fluid past a circular plate with a hole in the center, where the upstream and downstream velocities are fully developed and constant.
The ratio 20-40x Diam refers to the distance between the orifice plate and the diameter of the pipe. This ratio is important because it ensures that the flow is fully developed and the pressure drop across the plate is accurately measured.
The size of the orifice plate can affect the flow past it in several ways. A larger plate will cause a greater pressure drop and a smaller plate will cause a smaller pressure drop. The size of the plate also affects the accuracy of the flow measurement, as a larger plate may cause more turbulence and inaccuracies.
Fully developed flow past an orifice plate is commonly used in industries such as oil and gas, water treatment, and chemical processing to measure the flow rate of fluids. It is also used in scientific research and experimentation to study fluid dynamics and flow behavior.
The pressure drop across an orifice plate is directly proportional to the flow velocity. This means that as the flow velocity increases, the pressure drop across the plate also increases. This relationship is important in accurately measuring the flow rate of a fluid in fully developed flow past an orifice plate.