Hi Guys,(adsbygoogle = window.adsbygoogle || []).push({});

Been researching peristaltic pumps, but cant find an industry standard in designing them.

Wiki (http://en.wikipedia.org/wiki/Peristaltic_pump) has a little bit of maths on the occlusion, and a basic idea on calculating the flow rate

and this article explains a little of the theory

http://www.coleparmer.com/TechLibraryArticle/579

but there doesnt seem to be much in the way of a set of rules in designing one.

I came up with a little bit of methodology and wondered whether you guys could comment - or had a better way of dealing with it:

Anyone agree/disagree or have a good reference - would love the comments, thanks So if I put a tube on the table a metre long, and put one end in a bucket of water (assuming no height changes anywhere for now), then squeezed it in the middle (@ 0.5m) and dragged your fingers down towards the other end (not in bucket) what would be occuring:

I.e assuming a perfect squeeze (completely sealed) and I know the inner/outer diameters, young's modulus, and density of fluid (water), distance of drag is 0.5m I need to know my flow rate and "effort" required to pull some water up the pipe

flow rate is (pi*ID^2/4)*[speed I drag at) (iD is inner diameter)

work is force required * 0.5m,

Force required is...??? The effort to "suck" water up the pipe? Thats gonna be this equation: resulting in the change in pressure inside the pipe, which can be converted into a force by multiplying by the cross sectional area of the pipe:

[itex]\Delta P=f.\frac{L}{D}.\frac{\rho V^{2}}{2}[/itex]

?

If L is 0.5m D is inner diameter (at non squeezed point) and f comes from a moody diagram

Then as my fingers that are squeezing the pipe reach the free end, my other hand squeezes at 0.5m and does the same thing, I keep repeating this technique and I have peristaltic motion.

So now thinking of a peristaltic pump, i.e

the distance moved is half the circumference, the torque on the motor is the force required to "suck" * distance to pivot

The available speed is from Power = T* rotational velocity

therefore I now know the speed at which I can move that amount of fluid, so I have a flow rate???

If I increase the number of squeeze points to 4 (like the picture) then my force required increases by 4?

However the distance that I am sucking is now the distance between squeeze points

And what happens if I dont have "perfect squeeze"? Im thinking the force required (and flow rate) may fall away with a 1/r^2 rule? what do you think?

Perfect squeeze can only be considered depending on the tubing used - to stiff and creating a perfect squeeze may crack (damage) the tube, so maybe I would just want a 50% squeeze...

**Physics Forums - The Fusion of Science and Community**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Designing a Peristaltic Pump

Loading...

Similar Threads - Designing Peristaltic Pump | Date |
---|---|

Help to design/build a table top electric powered winder? | Yesterday at 1:32 PM |

Pumping Water -- Please check my pump system design work | Feb 28, 2018 |

How do I calculate the forces on a guitar stand (Tripod type) | Feb 17, 2018 |

Aerospace About Model Rocket Design | Jan 28, 2018 |

Torque calculations for peristaltic pump | Jul 29, 2012 |

**Physics Forums - The Fusion of Science and Community**