Beyond that, the flow expands, the velocity falls and the pressure increases. A little downstream of the orifice the flow reaches its point of maximum convergence, the vena contracta (see drawing to the right) where the velocity reaches its maximum and the pressure reaches its minimum. When a fluid (whether liquid or gaseous) passes through the orifice, its pressure builds up slightly upstream of the orifice :85–86 but as the fluid is forced to converge to pass through the hole, the velocity increases and the fluid pressure decreases. An orifice plate is a thin plate with a hole in it, which is usually placed in a pipe.
0 Comments
Leave a Reply. |