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

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A diffuser typically reduces fluid velocity by increasing the cross-sectional area, leading to an increase in static pressure according to Bernoulli's principle. Applying a negative pressure gradient by increasing inlet pressure over outlet pressure creates a paradox, as it forces flow through the diffuser. This action will continue until the output pressure adjusts to satisfy Bernoulli's equation. The discussion highlights the complexities of fluid dynamics and the implications of manipulating pressure gradients in diffusers. Understanding these principles is essential for addressing flow behavior in engineering applications.
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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