Back pressure problem in centrifugal pump
Back pressure problem in centrifugal pump
(OP)
Currently, i'm trying to design a physiological flow generator to mimic the blood flow. The system is similar to the picture I attached.
However, I'm having problem in choosing the suitable steady pump for the system, as I can't use gear pump (it has high haemolysis potential - damage the blood cells), I also can't use piston pump (it won't create a fully steady flow), . I'm thinking of using centrifugal pump as the steady pump, but the steady flow produced by the centrifugal pump will alter by the back pressure of the system.
Is using back pressure valve a good solution?
Is using axial pump a better option?
I'm in desperate for advice, any advice will be great :)
Thank you very much ...
However, I'm having problem in choosing the suitable steady pump for the system, as I can't use gear pump (it has high haemolysis potential - damage the blood cells), I also can't use piston pump (it won't create a fully steady flow), . I'm thinking of using centrifugal pump as the steady pump, but the steady flow produced by the centrifugal pump will alter by the back pressure of the system.
Is using back pressure valve a good solution?
Is using axial pump a better option?
I'm in desperate for advice, any advice will be great :)
Thank you very much ...





RE: Back pressure problem in centrifugal pump
RE: Back pressure problem in centrifugal pump
Have a look at this page. It looks like a centrifugal pump and obviously works.
As a matter of interest, why do you have to "re-invent" a blood pump? There are dozens of them out there.
RE: Back pressure problem in centrifugal pump
Does it not pump blood..?
A heart is very similar to a diaphragm pump.
Seems the obvious way to go.
Adrian
RE: Back pressure problem in centrifugal pump
I don't think I can use diaphragm pump as an option, as what i know, diaphragm pump will only allow one direction of flow. Meanwhile, it is essential for the system to be able to create a back flow, to cause the valve in the measurement section to close.
In overview, steady pump in the system should provide a continuity of the system, while the piston pump will be a flow modulator, to create a blood flow waveform, which includes a back flow.
I'm trying to design an experimental system that can mimic a wide range of blood flow waveforms (aortic flow, capillary flow, veinous flow, etc). While the blood pumps I found is mostly for surgical purposes, such as the centrifugal or axial pump on its own, and they can't produce back flow on its own.
I don't really understand how the 'back pressure valve' works, does it enable us to lower the back pressure acting on the pump?
RE: Back pressure problem in centrifugal pump
Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng
www.waterhammer.bigblog.com.au
RE: Back pressure problem in centrifugal pump
RE: Back pressure problem in centrifugal pump
It was a while ago I saw this. It may have been four rockers/pumps. With a bit of work it shouldn't be too difficult to work out the shape of the cam to produce this pump. The original patent was for a constant flow rate dosing pumps and was owned by the forbearers to Paterson Candy Ltd (now part of Black and Veatch in the UK) but they stopped manufacturing anything ages ago.
RE: Back pressure problem in centrifugal pump
RE: Back pressure problem in centrifugal pump
RE: Back pressure problem in centrifugal pump
RE: Back pressure problem in centrifugal pump
A reservoir will deliver pulse-free flow. Have a pump keep a reservoir at some level. Maybe a pressurized tank to deliver the pressure you need. That sounds like an accumulator. An accumulator will smooth pump pulses.
Ted
RE: Back pressure problem in centrifugal pump
Consider a Pitot tube pump. They give a steady pressure delivery with low flow, but the size you are looking for may not be óff the shelf'available.
Offshore Engineering&Design