# Search results

1. ### 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...
2. ### 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...
3. ### 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...
4. ### 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 :)
5. ### 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...