Can a piece that expands when blood flows through it decrease pressure?

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The discussion centers on whether a piece that expands when blood flows through it can decrease pressure in a tubing system. It is noted that if the flow is slow and friction losses are minimal, pressure remains constant throughout the tubing. However, if friction losses occur, pressure will decrease along the tubing, influenced by Bernoulli's principle. The concept of an expanding piece resembles the function of a pressure regulator, which also manages pressure changes. Overall, while the idea has merit, the dynamics of fluid flow and pressure regulation are complex.
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If i have a syringe used to pump blood through a set of tubing that becomes smaller and smaller, the pressure will obviously increase until it gets to the smallest diameter of the tubing. However, if I create a piece that expands when the blood flows through it, will this decrease the pressure?

The idea is that the blood displaces the walls of the tubing, thus reducing pressure. Is this idea physically possible?
 
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Actually, if the flow is slow enough that there isn't much loss due to friction, pressure is constant throughout the tubing. If there is loss, the pressure will decrease the further along in the tubing it gets. And that's even without adding in the additional decrease in static pressure (conversion to velocity pressure) due to the speeding up of the fluid and Bernoulli's principle.

You may want to look into Bernoulli's principle actually -- it explains a lot about your question: http://en.wikipedia.org/wiki/Bernoulli's_principle

However, if I create a piece that expands when the blood flows through it, will this decrease the pressure?
That sounds a lot like how a regulator works. There's more to it than that, though: http://en.wikipedia.org/wiki/Pressure_regulator
 

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