## Time to transfer a certain amount of mass between to vessels (Liquid butane to gas+liquid butane)

## Time to transfer a certain amount of mass between to vessels (Liquid butane to gas+liquid butane)

(OP)

I am trying to calculate the needed time to transfer a certain mass of liquid butane at constant pressure (about 2bar) to another vessel at vacuum. The environment temperature is about 273K. I tried some equations but the results were wrong. Can someone indicate me which equations should I use?. My background is in aeronautical engineering (navigation) so I am not an expert but i believe in this case on of the difficulties is that the process must be stooped before reaching the equilibrium situation (same pressure both vessels).

Thank you for your help.

## RE: Time to transfer a certain amount of mass between to vessels (Liquid butane to gas+liquid butane)

David Simpson, PE

MuleShoe Engineering

Law is the common force organized to act as an obstacle of injusticeFrédéric Bastiat## RE: Time to transfer a certain amount of mass between to vessels (Liquid butane to gas+liquid butane)

## RE: Time to transfer a certain amount of mass between to vessels (Liquid butane to gas+liquid butane)

_{f}*ghttp://en.wikipedia.org/wiki/Darcy%E2%80%93Weisbach_equation

David Simpson, PE

MuleShoe Engineering

Law is the common force organized to act as an obstacle of injusticeFrédéric BastiatDo you know if I can simulate this system with HYSYS, at least an approximation?

I mean the environment and inside temperature would be about 273k in both vessels. The vessels do not have any relevant isolation.

I have complete freedom to design the size of the pipes but I have in mind something really small

Diameter between 1-2mm

Length of the pipe 10-20mm

I want to transfer less than 1g but this doesn't matter right now I am i just want to find a usable method to calculate this case wit acceptable accuracy.

you need to select a suitable method and integrate in time domain,

by the way, I would guess from your comment about pressure drop correlations that your knowledge in this field is limited, microgravity influences mainly two phases flow, see for example Measurements and correlation of two-phase pressure drop under microgravity conditions.

in my opinion it doesn't make sense to use a simulator as you'll be unable to verify the results and this is a case where a black box can produce unconsistent data,

a better approach would be to use tools as Matlab or Mathcad and write your own code, define some test cases etc.

or (perhaps a wiser solution) ask someone more competent to do the work...

Good luck,

Latexman

Technically, the glass is always full - 1/2 air and 1/2 water.

Get a Mollier diagram for butane; The one that I found on line was for isobutane; and research the Bernoulli's equation for the conditions stated in any fluid mechanics book or Schaum's outline. You may have to assume an initial mass rate for Butane and probably have trial and error calculations in conjunction with time step analysis for which you can designate small time elements. I would also read about capillary tubes used in AC, to get an idea on pressure drops, materials used and flow rates.

Numerical Study of Refrigerant Flow in Capillary Tube ...

www.iasj.net/iasj?func=fulltext&aId=67350 · PDF file

Thank you. It is not to late. IT seems really interesting and useful.