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The inflow flow rate remains constant; if the outlet pipeline expands, how is the outlet pressure calculated?

2022-03-03View Original

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I would like to purchase a micro gear pump like the one in the picture for use in a setup. The input flow rate of the pump is constant (assumed to be 5 Bar). The specification of the pump’s output pipeline (the first section) is 4*2.5 mm. If, after this first section, a pipeline with specifications of 10*6 mm (the second section) is connected via an adapter, how can the fluid pressure at the outlet of the second section be calculated? Thank you very much
Reply #22022-03-05
According to Bernoulli’s equation, the lower the flow velocity, the higher the pressure. With a constant pump suction flow rate, if the second section of the pipe is thicker, the flow velocity will definitely decrease. According to Bernoulli’s equation, the pressure at the outlet of the second section of the pipe is higher than that at the outlet of the first section. However, in actual observation, it seems that the smaller the tube, the more forcefully the liquid is ejected; when the tube diameter increases, the outlet pressure should decrease, right?:o
Reply #32022-03-06
I didn’t fully understand the meaning of Bernoulli’s equation
Reply #42022-03-07
I would be even more grateful if you could tell me how to calculate it
Reply #52022-03-10
The inlet flow rate is constant (assumed to be 5 Bar) – this understanding is incorrect

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