Gas / Liquid Interface Heat Transfer Coefficient
Gas / Liquid Interface Heat Transfer Coefficient
(OP)
I have a water vessel with N2 blanket. If the water is at 5deg C and minus 7 deg C nitrogen enters the vessel, I am interested in how long it takes to reach a uniform vessel temperature.
By ignoring external heat transfer i see heat transfer as occurring across the gas / liquid interface. How can i estimate the gas / liquid interface heat transfer coefficient?
Thanks.
By ignoring external heat transfer i see heat transfer as occurring across the gas / liquid interface. How can i estimate the gas / liquid interface heat transfer coefficient?
Thanks.





RE: Gas / Liquid Interface Heat Transfer Coefficient
Concerned about ice formation and possible problems from that? Are these problems important or a nuisance? Do a what if. High N2 flow. No water flow. If important, just heat up the N2 a bit and forget about it.
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: Gas / Liquid Interface Heat Transfer Coefficient
If I was you I would work out your max volume of N2 and its heat capacity and mass and the min volume of water and its heat capacity and mass then sum the energy and divide again to work out temperature of the two on the basis that nothing changes and equilibrium eventually occurs. Given the huge density difference between water and blanketing N2, my guess is that the water temp will change by about half a degree at most.
You might be "interested" to know the time, but sometimes things are just not worth calcualting. Just do some experiments on your actual vessel.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way