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  1. markdblissmn

    Heat Sync Question

    But parallel gives the least deltaT temperature increase compared to a longer winding flow path, correct? Yes, Heat Sink. My apologies! Mark Mark Bliss
  2. markdblissmn

    Heat Sync Question

    I am trying to cool a linear electric motor. I want do design a custom water cooled heat sync into the support structure. The linear motor would be bolted to this with thermal paste between. Here is my basic question: Is it better to have a flow path in one direction across the part? Better...
  3. markdblissmn

    Two Tanks Connected by Gas Valve - Temperature Rise? Adiabatic Compression?

    There is a huge heat treating opportunity I am working on currently, where I want to pressurize a vessel to a certain value in as little time as possible. We would like to use air instead of nitrogen, as the facility has a large central compressed air supply available. I am worried about the...
  4. markdblissmn

    Two Tanks Connected by Gas Valve - Temperature Rise? Adiabatic Compression?

    I have a two part question: No, this is not homework. Reference my other threads (http://www.eng-tips.com/viewthread.cfm?qid=354606). 1. Why is nitrogen used in autoclaves? 2. What is the temperature rise and fill time for a two tank connected system. Is adiabatic compression valid...
  5. markdblissmn

    How long to fill a air cylinder? Time vs. Pressure vs. Volume

    Thanks for all of the information everyone. All I'm really after is information on moving a set amount of compressed air from a higher pressure source into a vessel initially at atmospheric pressure. I can use a facility compressor, gas bottle, set of gas bottles, etc. If I had a 2000psi...
  6. markdblissmn

    How long to fill a air cylinder? Time vs. Pressure vs. Volume

    The entire goal of my question is to minimize the fill time of a pressure vessel. If I can fill the vessel in 5seconds, great. 30seconds is too long for the application. 5-10 is ideal. Here is an easier question. Imagine I have two tanks of equal size connected with a one way valve with...
  7. markdblissmn

    How long to fill a air cylinder? Time vs. Pressure vs. Volume

    It's not for a class. I have been out of college for 6years and am helping my father in law with a design problem. Don't believe me? Check out my website. He works at a plant with a 1000Hp air system that feeds all of the machines. They want to try an experiment in a steel cylinder of 28"ID...
  8. markdblissmn

    How long to fill a air cylinder? Time vs. Pressure vs. Volume

    I am trying to figure out how to calculate how long it takes to fill an air storage tank of a certain size to a certain pressure given a compressor HP. What calculation or method should I use? Imagine a 1000HP central facility compressor connected to a 4" main distribution line. If I have a...
  9. markdblissmn

    "Pneumatic Cylinder" Pressure Vessel Design Codes with Locking Teeth

    What design codes cover pneumatic actuators? What legal concerns are there if a design doesn't have an ASME BPVC stamp? See below details... I am designing a custom quick locking pressure vessel that operates like a pneumatic cylinder - radial o-ring between upper half and lower half (not a...
  10. markdblissmn

    Binary Gas Thermal Conductivity Questions

    There will be extremely little convection, if any, only conduction, as the part is encased in a sand casting mold. There is no circulation of gases.
  11. markdblissmn

    Binary Gas Thermal Conductivity Questions

    Helium has a 5x multiple over air for thermal conductivity. Hydrogen is 7, but is flammable. We need the pressure of 10atm based on testing. We were just wondering if we used 70%air, 30% helium how it would work over 100/0, 80/20, 50/50, etc. The binary mixture will allow us to save on the...
  12. markdblissmn

    Binary Gas Thermal Conductivity Questions

    I found a copy of the book in PDF from 2001 online...
  13. markdblissmn

    Binary Gas Thermal Conductivity Questions

    What chapter or page in the text did you find this information? My father in law has a copy and I want to give him better guidance on where to look. I really appreciate your help. We are looking to use helium or a combination of helium/air at pressure to cool some parts coming out of a heat...
  14. markdblissmn

    Binary Gas Thermal Conductivity Questions

    I would like to understand if thermal conductivity is linear between a differing helium% / air% binary gas mixture and also how it changes at varying pressures between 1atm to 10atm. See below image...

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