Ethylene heat transfer coefficient
Ethylene heat transfer coefficient
(OP)
i found coefficient for conductivity but i need heat transfer coefficient(W/m^2*K) from surface to liquid/gas ethylene
can't find it
please help
can't find it
please help





RE: Ethylene heat transfer coefficient
Heat transfer coefficients (HTCs) may refer to conduction, convection and radiation. HTCs depend on (and are estimated from) the thermophysical properties of the fluids in question as well as on the temperatures, velocities, as well as geometrical and other considerations of the vessel or conduit.
As for the thermophysical properties you can find them in
just by writing the name of the chemical, selecting "fluid properties". Good luck.
RE: Ethylene heat transfer coefficient
Ballpark estimates for streams flowing in heat exchangers would be:
for the non-boiling liquid ~1 kW/m2K, for the gas ~0.2 kW/m2K.
RE: Ethylene heat transfer coefficient
tnx!
RE: Ethylene heat transfer coefficient
RE: Ethylene heat transfer coefficient
FWIW, for condensing and boiling, the overall HTC is about 600 W/(m2K). See
http://www.uop.com/objects/59chevronSpr99AICHE.pdf
RE: Ethylene heat transfer coefficient
RE: Ethylene heat transfer coefficient
Taken from Holman's Heat transfer for natural convection (no wind):
h(laminar) = 1.42(ΔT/L)0.25
h(turbulent) = 0.95(ΔT)0.33
laminar: 104>GrPr>109
turbulent: GrPr>109
From this I suppose the overall HTC would be much much much lower than the value quoted from the above link. It would necessarily be lower than the h values estimated above.
RE: Ethylene heat transfer coefficient
The emperical relations are derived for specific situations that normally differ from one another.