On the relationship between pressure and flow rate
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Why, when the pipe diameter is constant, once a certain pressure is reached, increasing the pressure further does not result in much change in flow rate?
As the pressure increases, the flow rate keeps rising, and therefore the resistance also increases. When the pressure reaches a certain level, the resistance increases rapidly, while the flow rate no longer changes significantly.
As can be derived from Bernoulli’s equation, it is as explained above