What happens if a negative pressure gradient is applied to a diffuser?

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SUMMARY

Applying a negative pressure gradient to a diffuser results in an increase in flow velocity, contrary to the typical function of a diffuser which decreases velocity by expanding the area. According to Bernoulli's principle, when a higher pressure is applied at the inlet than at the outlet, the static pressure at the outlet will rise until it aligns with Bernoulli's equation. This scenario presents a paradoxical situation where the expected behavior of a diffuser is challenged, leading to increased flow rather than a decrease.

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Engineers, fluid dynamics students, and professionals involved in the design and analysis of fluid systems will benefit from this discussion, particularly those focusing on diffuser applications and pressure management in fluid flow.

ahog
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A diffuser normally decreases the velocity by increasing the area. With assumption of an incrompressible flow, according to Bernoulli, the static pressure increases. What happens if one "forces" the flow through a diffuser by applying a bigger pressure on the inlet than on the outlet?
 
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Welcome to PF.

You have hypothesised a paradoxical impossibility.
The flow will increase until the output pressure rises to the point where Bernoulli is satisfied.
 
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Baluncore said:
Welcome to PF.

You have hypothesised a paradoxical impossibility.
The flow will increase until the output pressure rises to the point where Bernoulli is satisfied.
Thank you very much, i was really driving myself crazy...😂
 

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