Prandtl Number

[@ChenTim2www]

Thank you for this video. I have a question about the thermal diffusivity term which is for heat conduction. If the heat is transfer via convection, is the Prandlt Number still work?

[@data7traveller]

This is incorrect. High Prandtl number does not mean large temperature gradient (making an object a thermal insulator), otherwise heating oil would take too long!! High Prandtl number means more heat is transferred through actual molecular motion (momentum diffusion) rather than conduction (independent of molecular motion).

[@TheSIDHARTH007]

You are right...!!! There is an error in the explanation... The correction should be
the listed value for liquid mercury indicates that the heat conduction is more significant compared to convection, so thermal diffusivity is dominant. However, for engine oil, convection is very effective in transferring energy from an area in comparison to pure conduction, so momentum diffusivity is dominant.

[@chopperr3ad]

Took my lecturer 1 hour to explain Nu and Pr poorly. Took you 12 mins to do it well, thanks heaps!

[@tomascanales7418]

So, if the number of Pr is low means that no matter how hard I try to increase the speed of the fluid, it is not decisive in moving the heat? Or vice versa?

[@MoonLight11023]

Thank you so much man. This video is really informative :)

[@raptyaxa5771]

How does Pr change the convective behavior of an RBC system? Like, the difference of convective motion between gas (Pr=1) and oil (Pr=100). Which one is more turbulent, chaotic???
Thx.

[@endlessbass]

This was really helpful... Cheers buddy.

[@corporatemanthras]

thanks for the vid, and the one on Nusselt number too.

[@EngineerClearly]

Thanks, I appreciate it!

[@s.ashwinragavan7521]

thanks!! clearly explained it

[@survs21]

Absolute boss

[@royikatz8798]

Thanks. very well introduced.

[@parthpandya7077]

love it

[@EngineerClearly]

Thanks

[@EngineerClearly]

Thank you

[@timev3tech]

I won't watch because you mispronounce "Nusselt" in the Nusselt video.