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Thanks vpl, IRstuff and msquared48. Crane was helpful in getting to grips with what I should be looking for and I have made progress since starting to read it. However, while I am getting closer to solving the problem, I think the long tube with an diameter of less than 1mm is affecting my...

It is not for school. Up to now I have avoided all forms of fluid dynamics and am not at hot on them as I should be. I got away with this when I was working in structures but not so now in biomedical.

Thanks vpl, I'll get a copy.

Another way of explaining what I want to do is: I have a pump, which will pump water through a long length of pipe ( long in relation to its diameter) into a tank. it is a closed system. there will initially be a vacuum in the pipe and tank. i want to find out how long it will take to fill the...

As I said I am new to this area and now I understand better about the gas law. But what should I use instead?

The flow rate numbers are got from tests I have done on the hand pump. It is like a syringe except that instead of pushing the plunger it is twisted. I have calculated the change in pressure across the length of long tube (Hagen Poiseuille) using this flow rate. I have done this since posting...

Hopefully this explains the problem better: I need to calculate the time to fill and then deflate a catheter balloon. This consists of a hand pump connected to a long tube which then widens out to the balloon vessel. I need to reach a certain pressure in the balloon. The balloon is already...

No! I've retraining in medical device design and this is a work project I've been given.

Hi I'm new to bioengineering but I've been asked to calculate the theoretical inflation and deflation times for a catheter balloon. The inflation device has a flow rate of 1ml/sec in inflation and 5ml/sec in deflation. I have attached a portion of my code below. I find that the inflation rate...

Yes I am using a hand pump. It has a flow rate of 1ml/sec in inflation and 5ml/sec in deflation. I have attached a portion of my code below. I find that the inflation rate is to slow. In practice this can be inflated in 4.6 sec. The deflation time is too fast, as again in practice the deflation...

The balloon is 60mm long, and 2mm dia. the inlet pipe/supply pipe is 0.7mm dia. I want to inflate the balloon to 6atm.

Thanks. However I should have mentioned that it must be inflated to a specified pressure.

Hi I'm new to bioengineering but I've been asked to calculate the theoretical inflation time for a catheter balloon. Can any one point me in the right direction? Any guidance appreciated.