Heat Transfer (30) - Combined internal and external heat transfer in tubes

[@husnainhyder6713]

Now it seems clearly. Thanks Prof John Biddles along with whole CalPoly Team

[@Entius007]

How did he solve Tso?

[@hasundarwiche5589]

shouldn't it be pradtl raised to 0.4 for heating of turbulent internal flows rather than 1/3

[@mustafaakkol4594]

i think it should be 0.4 too

[@importfea8455]

No, it is valid for "turbulent internal flows". Pr^(1/3) is used for "external flow (flow over cylinder)".

[@byungshin8773]

he corrects himself later in the video at around 36:20 for a different problem. He forgot to correct it in the earlier problem, though

[@Dav2]

@@importfea8455 He's solving for hinternal in this part, so we wouldn't want to use the equation for external flow over a cylinder. So it should be Pr to the .4.

[@hacmustafaozturk708]

adamsın John Biddles

[@Entius007]

How did you solve Tso?

[@plopterjones2147]

Im wondering the same thing.

[@plopterjones2147]

Nvm, so, all the variables are known, then he just solves, look at the check marks.

[@MrThetruthteller]

n for Pr number should be 0.40 since it was heating

[@Mmichel07]

Nice problem!