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Recent content by 49078

  1. 49078

    Air compressor - choked flow

    Alright, well i went through the very helpful posts. I have gone through them all now, and started applying my numbers. Referring to Sailoday's post on June 20 and June 21 I have gone through and got T of ~22degC. This assumes a cd of 0.72 (saw this on another post regarding nozzles, not sure...
  2. 49078

    Air compressor - choked flow

    I have not really had a chance to read through the latest posts thoroughly but I have noticed a couple questions taht I can answer right away. There is no diffuser. We make no attempt to keep the velocity up. The nozzle exits into a tube(pipe) into the heat exchanger which is slightly below...
  3. 49078

    Air compressor - choked flow

    Let me rephrase my second paragraph. The reason I am looking at this, is a corrosion problem we have seen in a recent project at this blasting point. The -25C temp, would this be seen right at the exit plane of the nozzle prior to the velocity decreasing?
  4. 49078

    Air compressor - choked flow

    Iainuts, Thanks for your quick response. And I am concerned about problems caused by this temperature. I guess the temperature I found to be -25C(-13F) would be the temp right at the throat of the nozzle. This is not a CD nozzle so I will look into isenthalpic processes now and not...
  5. 49078

    Air compressor - choked flow

    My pressure ratio is (13/139) ~= 0.1 which is <0.528 so am I correct that this flow is choked? We are using compressed air, so I use a K value of 1.4. Using the formula given by Sailoday on his 19 Jun 06 post, T = ~-25deg C. Using the formula given on the webpage I refer to, and using...
  6. 49078

    Air compressor - choked flow

    I should really stress that I only have minimal fluid background plus I have not really used much of it since school over 3 years ago. I do appreciate everyone's help.
  7. 49078

    Air compressor - choked flow

    zdas04, I will look into JT effect. I also appreciate the reality check and I am glad the units entertained you. Iainuts, fluids is not my thing but I have been doing some reading on to get some sort of background on this problem. I thought that since no shock can occur (since not a CD...
  8. 49078

    Air compressor - choked flow

    Hello all, I have been trying to find the temperature of air after exiting a nozzle from an air compressor. The air in the tank is at 125psig and 25deg C and is exiting to a slight vacuum ~ 13psia. Nozzle exit area is 1/4". Flow rate from the tank is ~0.5cfm. B/c the back pressure is so...
  9. 49078

    Company Search - Breslove

    Cessna1, Thanks for the info. I tried that number and found that this particular company closed shop a few years back. Cheers
  10. 49078

    Company Search - Breslove

    I have been asked to look into a company that produced regenerative fly ash collectors. The company was called Breslove Seperators and was located in Pittsburgh. It appears that this company closed or was purchased by another company. Anyone have any knowledge if their product, or similar, is...
  11. 49078

    What am I?

    I am not 100% sure this is the right forum, but I'm sure it will do. I went to school as a materials engineer, but my job now is almost entirely mechanical. People often ask what kind of engineer I am, and I have been saying materials, but really all work I do is along the lines of a...
  12. 49078

    washer selection

    Well I never thought this would be such a popular thread. It was interesting to keep up with it.
  13. 49078

    Question: 1045 Steel heat treatment creation

    Sounds just like a lab I did in school...I no longer have my notes though.
  14. 49078

    Question regarding an efficiency formula and CO levels

    I do not think you can calculate theoretical CO because it is essentially an inefficiency. I believe that when you do your calculations for CO2, H2O exhaust that you assume complete combustion and therefore no CO as all the Carbon goes to CO2. But, I have seen a formula to give an estimate...
  15. 49078

    annual reviews = load of crap

    How often do you get 3's? Would other managers know your manager's policy to never get a 4? If they do, maybe they'll understand that a 3 with him is like a 4 with anyone else. Another way you may look at this, is your boss is probably more likely to give 1's to people. If you get all...
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