Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations IDS on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. borgwiser

    Looking for insulation--LOW thermo conductivity

    Quite interesting, thank you everyone. ko99, I will be contacting this company first thing Monday morning. Thank you very much. If their claims are true and valid, this could be a very good thing. Ryan
  2. borgwiser

    Heat transfer rate in uninsulated barrel

    Oops...the fourth line above should read: Q1 = m1*$dcP1|(Tref,T1) Q1 EQUALS m1 times the integral of dcP1 from Tref to T1
  3. borgwiser

    Heat transfer rate in uninsulated barrel

    Sounds like a good multi-part problem with a good set of assumptions given in an intro thermo course. Biggest question is what are the initial temperatures of the three liquids? With the initial temperatures you can solve this. Use the following equations: Q1 = m1*$dcP1|(Tref,T1) (read as Q1...
  4. borgwiser

    Looking for insulation--LOW thermo conductivity

    Melamine looks good at lower temps but the data sheet shows it topping out around 300 F. I'm looking for something that can withstand sustained temperatures of close to 600 F. I've checked into various types such as Roxul, Pyro-block, Kaowool, etc., and just can't seem to find the right stuff...
  5. borgwiser

    Looking for insulation--LOW thermo conductivity

    I'm trying to find an insulation with a thermal conductivity value of around 0.03 - 0.04 W/mK at around 575 K. So far the best I've found is at 0.06 - 0.07 W/mK. Does anyone know of a company or place to search for such a material?
  6. borgwiser

    graph of a pressure ratio

    Rearrange the equation slightly. It's a little tough without making explicit assumptions on the order of your operations, but I'm going to assume your equation is: Permeability = (C/t) x ln(Pressure Ratio) So, rearrange to: t = (C/Permeability) x ln(Pressure Ratio) If C and Permeability are...
  7. borgwiser

    Convective heat transfer from fluid to surface

    Been beating around with this problem for awhile and am just not happy with my results. I'm gonna venture to ask for help... I've been trying to model a process whereby heat is used to heat a plate (I've posted this question prior but I have revised some of the info as I've encoutered problems...
  8. borgwiser

    Heat transfer from air to plate (transient)

    I'm looking at the most complicated situation (again, out of curiosity, not so much for application). But, if I generalize it to the extent that the bulk mass does not change in temperature then......Ahhh!....it all came clear as I was writing this. I'm wanting to make a model to describe the...
  9. borgwiser

    Heat transfer from air to plate (transient)

    I was recently working on a project for a customer and after a few S.W.A.G.s I got the results I wanted. In the process, however, I found out that I really didn't know quite as much as I thought about heat transfer. Every transfer book I've used and seen does a marvelous job at situations like...
  10. borgwiser

    Finding heat transfer coefficient

    For a vertical plate (if properly sized and used with a horizontal plate you should be able to model a fin): a = 0.387 * (Ra^(1/6)) b = [1 + ((0.492/Pr)^(9/16)) ]^(8/27) Nu = [0.825 + a/b]^2 (I used this truncated form to make it easier to read). This is using a characteristic length value for...

Part and Inventory Search