# Recent content by boka33

1. ### Joule Thomson

Thank you! Nice to know about this tool, very useful, I used: http://www.chemistry.mcmaster.ca/~ayers/chem2PA3/labs/2PA36.pdf" [Broken] Equation (14) My results are slightly different, but the process in question is not isothermal, isobaric, or isochoric, the constant is enthalpy...
2. ### Joule Thomson

Thanks for the reply, but I can't see how to find the Joule-Thomson coefficient.
3. ### Joule Thomson

For future reference, I did figure out that you can calculate the Joule-Thomson coefficient using Van der Waals constants. Another option uses Beattie-Bridgeman constants. So I was able to figure it out from those known values.
4. ### Joule Thomson

I've been scouring the web in search of a Joule Thomson coefficient value for methane, but so far no luck. I have the volume, temperature, and specific heat as well... so I could also use the coefficient of thermal expansion for methane.. but I can't find that anywhere either!! Does anyone...
5. ### Choking in a Circular Orifice Plate in a pipe

The equation I have for velocity through a circular orifice plater is as follows: Ud = \frac{Yi\timesC}{\sqrt{(1-(d/D)^4)}}\sqrt{\frac{(2\times(P_{2}-P_{1})}{\rho}} To my understanding, flow becomes choked when this velocity exceeds a Mach number of 1, and is no longer sub-sonic...
6. ### Stored Energy in a pressure vessel

I think the difference is that I was assuming an isochoric process, since a tank of fixed volume held the process. Maybe this is not the case? Either way, it should be noted that in my case I am just looking for a valid approximation, so I do not wish to model a differential problem. I have been...
7. ### Stored Energy in a pressure vessel

Consider a problem where a tank holds compressed natural gas, compressed to approx. 250 times atmospheric conditions. Now release the tank valve letting some of the gas out. Assuming a small timestep, I can approximate the energy lost as 1/2 mv^2, where m is the mass released during the...
8. ### Eng/Phys educational videos

Thanks for all the replies. I should note, to clear up confusion, I am not actually a teacher! Just an undergrad mechanical engineering student.
9. ### Eng/Phys educational videos

Does anyone know of a good science/engineering series, exploring a broad range of topics. Essentially I'm searching for Bill Nye for undergraduate/graduate students. thanks :)
10. ### Heat Content of CNG

Working on a radiant heat calculation for CNG exiting a blow down stack (in case it was to flare). Part of the calculation requires the heat content of the gas, and I am unsure of what number to use. 47.8 MJ/kg is the number I am currently using, but I am unsure if this is correct. This...