Recent content by Ricardo Ferreira

You are really good, thanks for the help! Hope you help me more in the future! :) Regards

Thanks for the help, i just got stuck on the Nusselt Number, but I am starting handle that! That link still helps me, anyway! Regards!

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 :)

I put everything i have there, more than that just the draw, on solidworks... If helps! Thanks for the reply!

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...

Ahhh the material of the "heat exchanger" is Silicon Carbide, k= 20 W/mK

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