MET Orific Plate Fluids Sketch a graph of the distance versu

MET Orific Plate (Fluids)

Sketch a graph of the distance versus pressure along the pipe in the vicinity of the orifice plate. Also sketch a graph of the mean velocity versus distance. In the graphs, start a short distance upstream and go to a short distance downstream of the orifice plate. Imagine a fluid packet moving through the orifice plate. What happens to Its kinetic energy as it moves through the orifice and then downstream? Where does this energy go? Draw the flow profile with streamlines and eddies formed as fluid enters and exits an orifice plate, forming the vena contracta. Can you explain how the flow patterns result in a permanent pressure loss through the meter?

Solution

Answer 6

This phenomenon is known as boundary layer separation.

Downstream of the orifice plate, velocity is lower and pressure is higher. Hence there is an adverse pressure gradient established.

When there is a fluid flowing in the direction of adverse pressure gradient by virtue of its kinetic energy, the fluid particles near the walls lose their kinetic energy due to friction and tend to flow in reverse direction.