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Ok understood. They are only gibberish if boyles law doesn't apply. If it did, they would make perfect sense. Everyone has to be over there head at some point - it is how we learn. Surely compressibility is the whole reason that air is potentially dangerous (with poor engineering design) and...

Thank you for continued responses. Apologies if I am taking a while to understand. I try to understand every detail until it is clear in my head. The reason I was asking about the "available energy" was because it was used in a colleagues calculation. You have now reiterated the point about...

Thank you Dave. This is excellent. Had forgotten all about kinematics but it is coming back to me now! Finding this subject very interesting. A colleague of mine has also come proposed an alternative by calculating the available energy within a kg of air. Just going through the figures now. As...

Ok, thank you David that is very helpful. I understand that the Victaulic blank after a certain point of time will be out of the flow stream. If I estimate the energy in a system to approx. 250 kJ, is there a way of approximating how far a mass of x will travel? That way, we are able to...

Hi, Thanks for all the replies. Perhaps I am a little simple in my thinking. Because I understood the stored energy for air to be greater than water I associated this with an increase in force. I understand now that force is the same but that we are talking about a different variable. I am...

Hi, Thanks for the reply. Does the energy release from the pipe/system containing the compressed air not depend on volume though? i.e. a smaller volume of air will not have as big an energy release as a large volume. This is only the case for air though and not for water as it is...

Hi, Is it possible to determine the force behind a 300dia cap end (blank) when undergoing a 0.5bar pneumatic air test and subsequently how far the force may move the 16kg cap end? The volume of air can be estimated. Thanks

Hi I am trying to perform non linear optimisation that requires interfacing between matlab and ansys. I have learn't from ansys guides how to start ansys using a batch file which i can run from matlab but what I don't know is how to alter variables for the ansys run. The optimisation is the...

Er I think I created a sketch, all the lines are within the same sketch if thats what you mean. Yes, that's exactly what I want.

Hi, I have drawn the shape below. http://i423.photobucket.com/albums/pp315/skaboy607/Uni/heat_exchanger_halfinch_2.jpg I drew it using the line tool and then applying the desired radius I require of 38.1 mm. I then used the 'tube' tool to create the shape with required inner and outer...

Simple question-how do you draw your lines like that? When I click on line, I have define a plane etc but your drawings just start lines in the middle of nowhere!

Thanks guys.

I am using NX 7.5. It doesn't let me open the file.

Hi, I have drawn using the helix and tube tools a copper coil for heat transfer-see image below. http://i423.photobucket.com/albums/pp315/skaboy607/Uni/coiltst_2_2.jpg What I would like to do is extend the start and end points so that I end up with this-see image below...

Ha, yea I got confused writing it so why I thought anyone else would understand what I was saying. Hopefully the image below describes the calculations and system that I am working on.

Not quite I don't think. The coil is cooling water that enters the top of the tank at 25degc. I want it to leave the tank at the bottom at 15 deg c so I used those values as my t2 and t1 to calculate the cooling load.

Can I do this for my calculations.... Heat transfer = mcp(t2-t1) for the fluid coming into and out of the tank. Ans is 418W. Then use Q=hA(tfluid-tcoil), rearrange for A: A=Q/(h(tfluid-tcoil) to give me the surface area needed to satisfy the load?

Thanks Speco. Is that an overall heat transfer coefficient or the h tsf coef from the coil to water in the tank? Have you got a reference for that value by any chance? Thanks Will

Ok I see what you mean. Yes the idea of doing the 2nd method is what I think I have been describing. But...how would I got about this? To obtain an overal U value, I need to know the heat tsf cof in the tube and then to the water in the tank. I can calculate the one in the tube but how do I...

Now I am confused. Perhaps I haven't explained myself very well, problems always seem clearer in your own head so apologies if thats the case. Why would I cool the fluid before it enters the tank, that is why I have got the fluid passing through the tank and why I need to size the coil to cool...