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Industry Information
Principle of the relationship between flow rate and flow pressure
2011-6-3 9:07:06

Differential pressure flow meters led by V-cone flow meters have been widely used in today's field measurement. However, there are still more or less misunderstandings between many on-site maintenance personnel and on-site flow and pressure. There is a direct relationship between them. In fact, there is no special relationship between the on-site flow and pressure, but there is a direct relationship with the pressure difference between the two ends of the pipeline, and the opposite is an inverse relationship between the flow rate and the pressure. The following describes the principle of the relationship between flow and pressure:
The flow rate of the pipeline is not determined by the pressure, but by the pressure difference between the two ends of the pipeline. More scientifically, it depends on the magnitude of the pressure gradient (the pressure gradient is the pressure difference per unit length). The pressure difference is the power of the fluid flow in the pipe. Any Actual fluid flow has resistance, and the pressure difference is used to overcome the resistance to do work. So when there is pressure and there is no pressure gradient, the flow is still zero. The pressure is not large, but with a large pressure gradient, the flow may still be large. On the contrary, the pressure is very large, but the pressure gradient is very small, and the flow may be small.
For uniform pipes of equal diameter, the relationship between the flow Q and the pressure difference (P1-P2) can be derived as follows:
Q = SV = SC√ (RJ) = SC√ [R (P1-P2) / L]. It is known from the formula that when P1 and P2 are both large, but when P2 is close to P1, the flow rate is small, so it cannot be simply said that "the greater the pressure, the greater the flow rate."
The "higher flow rate, the lower the pressure" according to Bai's law of hard work refers to the flow of a certain flow of fluid. When the flow area changes and the flow rate changes, the relationship between the flow rate and pressure. The pressure of Parker's Law is to determine the pressure on the section (strictly speaking, pressure), not the pressure difference.

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