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

AI Thread Summary
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
Messages
4
Reaction score
1
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?
 
Engineering news on Phys.org
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.
 
Reply
  • Like
Likes russ_watters and ahog
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...😂
 

Thread 'Race car suspension Class'

Posted June 2024 - 15 years after starting this class. I have learned a whole lot. To get to the short course on making your stock car, late model, hobby stock E-mod handle, look at the index below. Read all posts on Roll Center, Jacking effect and Why does car drive straight to the wall when I gas it? Also read You really have two race cars. This will cover 90% of problems you have. Simply put, the car pushes going in and is loose coming out. You do not have enuff downforce on the right...
View full post »

Thread 'Cantilever help'

I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
View full post »
Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Scenario 1 (figure 1) A continuous loop of elastic material is stretched around two metal bars. The top bar is attached to a load cell that reads force. The lower bar can be moved downwards to stretch the elastic material. The lower bar is moved downwards until the two bars are 1190mm apart, stretching the elastic material. The bars are 5mm thick, so the total internal loop length is 1200mm (1190mm + 5mm + 5mm). At this level of stretch, the load cell reads 45N tensile force. Key numbers...
View full post »

Similar threads

Doublet flow in Fluid Dynamics between two spheres or cylinders
Replies
0
Views
1K
Pressure Switch to Diaphragm Flow Switch
Replies
3
Views
3K
Behavior of heat addition in a compressible flow
Replies
9
Views
3K
Modeling Air Compression Cylinder
Replies
45
Views
5K
Bernoulli equation and parallel pipe branch
Replies
31
Views
4K
How to determine when compressible flow is choked?
Replies
4
Views
2K
I How can concentration gradient field come into existence immediately?
Replies
1
Views
3K
Tubing Pressure drops with Compressible Fluids
Replies
3
Views
1K
Bernoulli vs. Reynold Transport Theorem Problem for Raincap
Replies
11
Views
3K
EDF Rocket with Thrust Tube: Physics Explained
Replies
8
Views
3K

Hot Threads

Recent Insights

Back
Top