velocity equation for pulsation blood flow

[alifar]

Hi,
I want to simulate blood flow with Finite element software and want to put velocity as boundary condition in inlet, for pulsation blood flow I need to have velocity function and it should be related to time, angular velocity of blood and so on, actually I could not find that, anybody knows that equation or more information?

Regards
Ali

 

[MikeHalloran]

Huh? Angular velocity?



Mike Halloran
Pembroke Pines, FL, USA

 

[alifar]

Hi,
Yes, Angular velocity. it comes from omega( angular frequency of blood flow).

 

[MikeHalloran]

I understand that. I just can't figure out where the slider-crank is in the heart.

By the way, please Red Flag all but one of your duplicate messages and ask that they be removed.


Mike Halloran
Pembroke Pines, FL, USA

 

[sailoday28]

Search "George Rudinger and blood flow"

 

[MikeHalloran]

Thanks for the vector.


Mike Halloran
Pembroke Pines, FL, USA

 

[chicopee]

Try an internet literature search of Wright Patterson AF base Physiology department.

I guess somewhere in the circulatory system, blood flow rotates perhaps where the heart valves.

 

[MikeHalloran]

I searched for quite a while, and found an IEEE page offering a paper for money.

I couldn't find the right paper for the right price, e.g. free to the taxpayers who paid for the work.



Mike Halloran
Pembroke Pines, FL, USA

 

[MikeHalloran]

Besides, where I was really going was this:

While it's convenient to model periodic phenomena using sinewaves (and angular velocity as a parameter), I can't find a reference asserting that arterial blood flow is actually sinusoidal or quasi-sinusoidal in any sense other than it's periodic.

There is also potential for some confusion because at the Reynolds numbers typical of blood systems, there is potential for quasi-stable vortices, which would have a real angular velocity of their own.





Mike Halloran
Pembroke Pines, FL, USA

 

[whammett]

Also, try finding two arteries that are exactly the same. On top of unpredictible turbulence(due to pulsations and the bending and turning of arteries, capilaries, etc), pulsating flow, unknown "piping" diameter, and potentially partially blocked "piping" due to plaque deposits, it is exremely hard to model blood flow.

The best you could do would be to model an average diameter, completely unblocked, straight artery. And that estimate should get you in the ball park, but is in no way, shape, or form accurate.

"Scientists dream about doing great things. Engineers do them." -James Michener

 

[whammett]

Ok, I immediately reject my last option of a straight artery. You could model arterial pulsations of main arteries because the main path is rather uniform in all human persons. It still wont be very accurate though.

"Scientists dream about doing great things. Engineers do them." -James Michener

 

[BigInch]

As you can see, pipe diameter also varies with pressure.

"We have a leadership style that is too directive and doesn't listen sufficiently well. The top of the organisation doesn't listen sufficiently to what the bottom is saying." Tony Hayward CEO, BP

**********************
"Being GREEN isn't easy" ..Kermit

http://www.youtube.com/watch?v=hpiIWMWWVco

http://vir

 

[chicopee]

Tony Hayward,BP CEO,isn't he the guy that said the oil spill is just a drop in the bucket or something to that affect.

 

[mjpetrag]

http://herkules.oulu.fi/isbn951426973X/html/x957.html

What you're referring to is known as Pulse Wave Velocity. Velocity becomes higher the older you get because your arteries lose their elasticity.

Equations can be found on the link above.

-Mike

 

[stanier]

Blood is non Newtonian and thus the flow characteristics are somewhat complex. You may try and get in touch with Prof John Reizes through the University of New South Wales or University of Technology Sydney. He has retired but did a lot of work developing the artificial heart here in Australia.

I dont know if this email address will reach him john.reizes@uts.edu.au

 

[BigInch]

Pulsatile Flow,

http://www.rwc.uc.edu/koehler/biophys/3d.html

http://www.rwc.uc.edu/koehler/biophys/3e.html

Interesting site,

http://www.rwc.uc.edu/koehler/biophys/contents.html

"We have a leadership style that is too directive and doesn't listen sufficiently well. The top of the organisation doesn't listen sufficiently to what the bottom is saying." Tony Hayward CEO BP
"Being GREEN isn't easy." Kermit

http://www.youtube.com/watch?v=hpiIWMWWVco

http://virtualpipeline.spaces.liv