Hello Chestermiller,
I was looking on some books and i found that,
Circular Tubes (Laminar Flow):
Nu=(h*L)/kf = 3,66 to Constant Surface Temperature
Nu=(h*L)/kf = 4,36 to Constant Surface Heat Flux
But then on other book i found:
Nu=1,86*(RePr)^0,33 * (de/L)^0,33 *...
Im trying doing that, so i got that Reynolds arround 1000, that's mean laminar flow, now i don't know how to do it... I know i need Nussel number to calculate hint and hext, and have many formulas and i don't know how to use it yet... So i put there to know if have any simple way to do it :)
Thanks for the reply,
The problem that's not a "normal" Heat exchanger.
Its just 42 tubes, that pass in the furnance to pre heat the air.
the tubes are perpendicular.
The problem using the LMTD how i know the correct heat transfer coeficiente(U)? If i don't know the exact heat convection...
Hello guys,
I have a problem with my work!
I have a furnance that have a "heat exchanger" to heat the air that will be used on the burners!
(You can work every value close to 1 atm pressure on the entire exercice)
The furnance is 1100~900 ºC
The fan sends in a tube 7500m^3 air per hour...
Hello guys,
Im from Portugal, 24 years old.
Im new here, i just got my first job.(Mechanical Engineering)
Im working with thermal development. Upgrading thermal equipments, like industrial furnances, kilns, dryers etc...
I hope we can help each others :)
Regards,
Ricardo Ferreira