Heat Transfer (13): Transient heat conduction, lumped heat capacity model and examples
ฝัง
- เผยแพร่เมื่อ 28 มิ.ย. 2024
- 0:00:16 - Transient heat conduction, lumped heat capacity model
0:12:22 - Geometries relating to transient heat conduction
0:21:07 - Example problem: Copper sphere with transient heat conduction
0:27:21 - Review for first midterm
Note: This Heat Transfer lecture series (recorded in Spring 2020) will eventually replace the earlier Heat Transfer series (recorded in Fall 2015) in a couple years. The old lecture series had some errors and was lower quality.
Want to see more mechanical engineering instructional videos? Visit the Cal Poly Pomona Mechanical Engineering Department's video library, ME Online: www.cpp.edu/meonline
This lecture series was recorded live at Cal Poly Pomona during Spring 2020. The textbook is "Introduction to Heat Transfer" by Bergman et al.
![อาจารย์ยอด : สวยกินคน [ผี]](http://i.ytimg.com/vi/_-TIJOwkRA4/mqdefault.jpg)
This professor is fantastic. I've never gone to this school or had him, I'm just watching his videos to review some fundamentals, and wowwie. Great work, Professor, and thank you.
You're welcome!
I have my midterms tomorrow and these lectures are coming in clutch. Thank you
Good luck!
We are really grateful for these educational supplements. We can't express our gratitude in words. Thank you very much.
We're glad you found them useful.
Thank you so much for this, really clear and straight forward
Thanks!
This professor is the only reason I understand even the most basic of concepts, I'd have an even worse grade if it wasn't for him.
Hooray!
Really appreciate the videos. They are comprehensive and concise. From NWU
Glad you are enjoying them.
Legend ….thanks for UOA
This guy is amazing.
If you are from some famous college in Mumbai , say Hii
Interesting, can we express (hAs)/(mCp) as 1/(Rtotal*mCp) Where R can be as Rconv+Rcond and how has to be looks Biot number in this case?
Good content
It was a nice lecture
Thanks!
why does the graph for exp have an inflexion why does it not look exp(-x) type
i like that person much
he is fantastic
In the energy balance why is energy generation subtracted? Shouldn’t it be added? Anyone care to weigh in and lmk?
Can anyone provide me w the mid term questions?
Is the h, in this example given? I don't see it in Appendix A.1.
my question as well..
yeah h should be given. value of h is not given in appendix. if value of h is not given you need to find h yourself. for that you will need nusselt number.
At 23:16, how does he know that h is equal to 25?
it's in the problem statement, he just didn't specify it earlier
13:40
In Copper sphere example how was h obtained?
How do you find h in general I assume you need tables with a few properties.
Thanks
Convection coefficients are discussed in later lectures.
shouldn't Bi be much greater than 1 to use the lamped capacitance method
Nope, you use Hiesler's charts then. For less than 0.1, LCM. For greater than 100, error function method.
how could L sub c (volume to surface area) of a cylinder == radius/2 !!! its unverified
I believe it's for slender (very long compared to their diametres) cylinders, where r is not that long compared to l? That simplifies the characteristic length to roughly r/2.
perfect, but i wish if you solve harder problems
LUAI
6 NOV.2022
ME 315 | M II
B#63
I hope in the future yall would get some people who can work a camera correctly and give the person watching the video time to write down what is being said or was just written. Having to stop every few seconds gets annoying and makes me lose my train of thought and ability to focus on whats being taught. We do not need to see the professor walk from one side of the room to the other explaining things while drinking coffee. Please in the future find better people to operate the cameras.
We gave the camera operator this feedback. Later videos don't have this issue.
what a cry baby lol go back to chegg
the cameramen really made me angry...