Recent content by men5j2s

Hi JBA, Thank you for the detailed response.. I'm hoping to model a 'steady state' scenario. I am assuming uniformity between the two orifices. I have calculated mass flow rate across the first orifice, but to do that I had P1, T1 and the viscosity of the liquid in chamber 1, I have no clue...

Hi Russ... I am getting a bit overwhelmed by the theory in this field... I have a liquefied gas (high pressure - 6bar) Can is upside down (stem down), so gravity ensures that when I spray, I spray liquid. I am spraying into a second container with a volume a little larger than that of the...

I'm releasing pressurized propellant into another chamber which is at atmospheric pressure, I want to estimate the temperature to which that chamber will drop to and the rate at which the liquid (collecting in the new chamber) will boil. The second chamber is open to atmosphere via a small...

1.3 g/L * 0.0175 L (or 17.5ml) = 0.02275g (or 22.75mg) You are correct, I made an error in transposing (that's why we Verify :wink:), well spotted!

Hi All, I'm trying to answer a question once and for all that has caused more debate than it ever should have (talking about an internal debate)... If I fill a sealed vessel (say an aluminium vessel with appox. 17.5ml of internal volume) with varying amounts of helium ( 1bar, 2bar, 3bar ...

Yes, that's correct

I'm not sure I'm with you here.. I calculated the number of moles by using 8.56m^3 (amount of helium in the cylinder, as per BOC) and 0.1785 g/l (as the density of helium). At STP I get 22.7 moles/L => 22.7*8.56 => 8560/22.7 = 377.1 moles in 8.56m^3 Also if i do Volume / density, then mass...

I've decided to use a flow meter and pressure transducer, but this is going to be costly as I need 5 of each :(

The cylinder is, but what I'm ultimately trying to do is use a supply cylinder to fill a smaller cylinder and I'm trying to get a feel for the temperature changes I can expect to see during this process.

Quite possible that there's a mistake there... BOC stated 8.56m^3 as the volume (of He) at stp we have 1 mole in 22.7L 8560/22.7 = 377 moles. I used the physical height of the cylinder to estimate the volume, but looking at BOC website now, they give the "water capacity" of the cylinder as...

I did PV/nR (296.08*112)/(377.1*0.082) What I would ideally like to do, is understand what's happening in the second vessel (the first one is just a pressurized helium cylinder acting as a reservoir), the second is going to be filled to around 8 bar, from empty. So if I can model the...

How can I calculate the temperature changes of a pressurized gas as it is in a cylinder, then as it is when flowing into another vessel? my best guess was using the ideal gas law (with help from this forum), but I feel like I'm using it wrong. P = 300bar or 296.08 atm V = 112 L (is this...

So I can obtain the pressure in the vessel that I'm filling at t=0 (1atm as its empty), then Pressure at t=1s, 2s, 3s...etc (likely to be in millisecs) and and use the mass in grams (derived from the mols of helium as given by the ideal gas law) to work out a mass flow rate in kg/s (m-dot)...

Hi all, I'm new here and saying hello. I'm a PhD bioengineer working on mechanical devices, and have a sizable gap in my knowledge when it comes to physics. I'm hoping to learn a lot here J

I am using a compressed gas tank to fill an otherwise empty container, The gas tank is around 50bar and the container will be filled to 6bar. If I am using a pressure transducer to determine when the container has been filled to 6bar, can I use the information I gain from it to derive the flow...