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  1. Lepetit

    Welding properties Catia FEM

    Hello all, I have some doubts when I try to define my welding connection in Catia V5. Always you create a welding element between two elements, you've the possibility to select the type of the welding seam, this means: - Rigid - Contact - Hexaedron - Beam - Rigid-spring-Rigid -...
  2. Lepetit

    Minor losses in a cooling circuit

    Thank you all, I will take a look in the book. @rconner: Sorry I can't give you more info but we are trying several setups so it's not yet well fixed. Cheers
  3. Lepetit

    Minor losses in a cooling circuit

    Hello all, I am doing the calculation of a cooling system for a cryogenic magnet. I would like to ask where can I find different values for the minor losses. I have already found some values for standard angles as 45deg or 90deg as well as for normal tees and wyes (45deg). Is it possible to...
  4. Lepetit

    Pipe measurements

    Thank you very much both!! I will check all the info. hank you again! Cheers
  5. Lepetit

    Pipe measurements

    Hello all, I want to monitored (mass flow and pressure) a pipeline of 6mm inner diameter and 8 mm outer diameter. does anyone know a company which sells components for these sizes of pipes? Thank you very much
  6. Lepetit

    Results Ansys vs Catiav5

    Thank you again! So definitely I will trust more in Ansys than in Catia. Thank you again!! Cheers
  7. Lepetit

    Results Ansys vs Catiav5

    hello, Yes the values of Ansys are in the first post, maybe it's not so clear, otherwise all of you say that it's better to trust in Ansys so I will do this. Thank you very much Cheers
  8. Lepetit

    Results Ansys vs Catiav5

    Sorry I thought I was atached it! Thank youhttp://files.engineering.com/getfile.aspx?folder=77b0583c-ac23-47c6-a284-875d56fab131&file=eng_tips.zip
  9. Lepetit

    Results Ansys vs Catiav5

    Hello all, I have made a FEM analysis in Ansys a Catia V5. I have different results and I can't explain why, I attach a picture first of one error in Catia that I don't understand so well. The force applied had been 1000N. I attach also a picture in Catia with the system analyzed where it's...
  10. Lepetit

    Heat transfer coefficient

    Yes, the problem was that I was chosen a bad correlation to make the theoretically situation with my system. Now it seems so much accurate with the Raithby and Hollands correlation. Finally I think that i will use this one. Thank you Cheers.
  11. Lepetit

    Heat transfer coefficient

    Perfect!! thank you very much
  12. Lepetit

    Heat transfer coefficient

    @ione, please can you write the correlation or put the link where I can find it? I am trying to look for it and I can't. Thanks
  13. Lepetit

    Heat transfer coefficient

    @IRstuff, yes all the temperatures have been measured before, after I made the inverse way just to validate the value of the Heat transfer coefficient. @ione, thank you very much! I will check right now. Thank you both. Cheers.
  14. Lepetit

    Heat transfer coefficient

    @IRstuff I know everything about the coolant which is inside the pipe, so I have already calculate the inner heat transfer coefficient. The "problem" appeara when I calculate the heat transfer coefficient outside the pipe (air-pipe) because if I calculate the heat flow with a normal value of...
  15. Lepetit

    Heat transfer coefficient

    Thank you very much for your fast and helpful answer ione. The problem to calculate an accurate value of it is that the pipe it's not completely horizontal or vertical, also in some points it's touching some platforms...really difficult to be accurate. Thank you for the info again! Cheers
  16. Lepetit

    Heat transfer coefficient

    Hello all, I have a questions, can be possible a heat transfer coefficient of 6 (W/m^2/K) between the air inside an office an a pipe of Polyurethane? I assumed natural flow convection. I have calculated the heat flow in a radial direction (everything is known: temperatures, thermal...
  17. Lepetit

    Aluminium vs PU

    I know that it is impossible to have all the properties of the world in only one material, that is the reason what I am asking for some doubts that I have... The priority order: - not activated in short terms of time (in case I need to replace it) - good thermal conductivity in order to improve...
  18. Lepetit

    Aluminium vs PU

    Yes the coolant can be activated too, but the problem (under the point of view of the project) affect more in the pipes because you can be in touch with them. You are right, PU is a bad conductor; because of this I want to use anoher material. I need to improve as much as possible the heat...
  19. Lepetit

    Aluminium vs PU

    Thank you, 1) Yes, it will be bombard by neutrons and also PU is polyurethan (sorry for the misunderstanding). 2) The problem to use another coolant is the range of temperatures that I want to work. 3) Using Polyurethan you avoid the radioactivity activation but the problem is its thermal...
  20. Lepetit

    Aluminium vs PU

    Hello all, I want to use aluminium pipes in a cooling system in which it will reach -25ºC (243K) with water-methanol as coolant, can be this a problem because of the corrosions of the aluminium?. Also I would like to know if aluminium can be activaed by radiation, because this fact can be a...

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