Heat Transfer (05): Heat diffusion examples, 1D conduction in a plane wall

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Heat Transfer (05): Heat diffusion examples, 1D conduction in a plane wall

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Күн бұрын

0:00:15 - Example problem: Heat diffusion
0:05:28 - Example problem: Heat diffusion
0:18:04 - Steady state 1D conduction in a plane wall
0:26:28 - Analogy to Ohm’s Law
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/meo...
This lecture series was recorded live at Cal Poly Pomona during Spring 2020. The textbook is "Introduction to Heat Transfer" by Bergman et al.

Пікірлер: 60

@throttlejunky2211 3 жыл бұрын

If only there was a camera guy who could pay attention. otherwise great video

@nournoman9191 2 жыл бұрын

in the min 16:00 Eg dot = q dot * Area * L , q dot and Area and L are given, plug in the values to get 1000*10*1 = Eg dot, hence the equation is : Est dot= Ein dot + Eg dot - E out dot Est dot = 120 kW+(1000*10*1) - 160 kW Est dot = -30 kW = -30000 W Hope this helps :)

@marioleon4102 11 ай бұрын

I hope that camera operators career goals don't involve operating a camera, because my god man, FOCUS.

@joaquin9198 3 жыл бұрын

i hope the camera guy is not getting paid with tuition money caz wooow

@athanasiosmatrapazis4111 3 жыл бұрын

Thank you so much for the courses! At 15:58 in the Heat Diffusion Equation we get Watts/m^3. We need to multiplie to volume (AxL) to get Watts.

@ryancrumley8616 7 ай бұрын

Thanks for posting these videos. They really help me understand what's going on and how heat transfer works.

@CPPMechEngTutorials 7 ай бұрын

Our pleasure.

@sanjitpandey552 2 жыл бұрын

Cameraman god dang it

@theazndonut1 2 жыл бұрын

The camera guy has one job. Come on man.

@ramonhppacheco 2 жыл бұрын

@14:40 you shouldn't rule Eg dot out of the equaation. It represents the term q dot *Volume. Having that and Ein dot as q (x=0) and Eout dot as q (x=L), you'll get to the correct answer of -30kW fot Est dot.

@conchscott9910 Жыл бұрын

Last video we complained that he was moving to much so now he say I ain’t moving no more then😂

@CPPMechEngTutorials Жыл бұрын

Okay... we'll take down all these free videos. :(

@choubatsu5860 Жыл бұрын

@@CPPMechEngTutorials No thank you, I'm going back for my master's degree and going back to school for first time in 10 years. thank you so much for the refresher lol

@ibrahim4951 6 ай бұрын

@@CPPMechEngTutorials no need to get sensitive. Its that we as viewers at least expect to see whatever you're recording in the class. not just freeze into one single frame and miss every other frame

@CPPMechEngTutorials 6 ай бұрын

@@ibrahim4951 Sarcasm is difficult to transmit in a KZfaq comment.

@user-px8in4su9q 3 жыл бұрын

23:55 Isn't C2 supposed to be T1 not T2?

@wilfredoteran9314 3 жыл бұрын

yes

@sametarslan2121 Жыл бұрын

@@wilfredoteran9314 yes :(

@charlesdlamini8126 3 жыл бұрын

Hi Graph is not visible

@manuboker1 Жыл бұрын

Thanks ! Wonderful Heat Transfer lectures !

@itzipocalyspe9396 3 жыл бұрын

@14:40, should Egen be q dot * volume = 10000 W (assuming z=1)? If so then the Est equation would equal -30,000 W

@jackstratif9988 3 жыл бұрын

Yes, and that’s what the textbook has for example 2.3

@dinushachathuranga7657 10 ай бұрын

Buch of thanks for the amazing explanations❤❤❤

@xplosiveactionarchive9092 2 жыл бұрын

18:09 can someone explain why you can solve for Pc_p dT/dt and how that gets you to the Est = -30,000W?

@theograss2186 10 ай бұрын

So you use the entire diffusion equation like he did before as we solved for those values in the previous part. So from the right hand side you divide over density and c_p and solve for dT/dt, since density and c_p are known. Using this result you can then solve for Est =density*c_p*dT/dt. Hope this helps

@apple-fs3bm 8 ай бұрын

Any chance you could share a list of the homework assignments? It would be a game-changer for my prep! Thanks a bunch!

@clarenceroopnarine6180 3 жыл бұрын

Is it safe to assume that the heat flows normal to the wall surface?

@muhammadluqman4117 2 жыл бұрын

sir at 15:14 you got the answer for the Est= 30k W thats not correct we get Est= 40000 if Egen= 0

@amogneworkie3225 Жыл бұрын

yah got 40.000 also

@sanjitpandey552 2 жыл бұрын

If we want to use the equation for part b, how do we get dT/dt?

@evaristogabriel8208 2 жыл бұрын

I think you don't, because dT/dt is a component of E(storage)

@hadideyal9377 9 ай бұрын

sir you are amazing thank's

@user-wc2wr6ry2d Ай бұрын

link ok pdf for our text book, please

@moq4463 3 жыл бұрын

at 15:20 why is it -30,000 watts and not -40,000 watts? Where did that -30000 watts come from?

@antonventura6364 3 жыл бұрын

same question

@martinhvik2216 3 жыл бұрын

E_gen should be q_dot * volume, so 1000 W/m^3 * 10m^2 * 1m= +10,000 W, and therefore it's -30,000 instead of -40,000.

@antonventura6364 3 жыл бұрын

@@martinhvik2216 thank you very much!

@lauragomez3516 3 жыл бұрын

@@martinhvik2216 but he said E_gen is equal cero, so I am lost again

@theomnipresent1 3 жыл бұрын

@@lauragomez3516 He said it was zero and crossed it out. When he wrote out his givens @ 7:21 E_gen was given, and he forgot.

@raiyanowaiz487 Жыл бұрын

What is the camera guy doing?

@CPPMechEngTutorials Жыл бұрын

We know we know. :P

@alidogru7188 2 жыл бұрын

which book do you follow I know çengel's book

@xplosiveactionarchive9092 2 жыл бұрын

The textbook is "Introduction to Heat Transfer" by Bergman et al.

@OZ_viking 2 жыл бұрын

Can anyone explain where is -100x came from??? -300-100x... 12.10 min.

@deniseclairearimadopillo6177 2 жыл бұрын

The derivative of T(C) = 900-300x-50^x2 is -300-100x since 50 is raised to 2. I hope this helps

@itzipocalyspe9396 3 жыл бұрын

Maybe they should get one of those 360 cameras so we can follow the professor ourselves

@MrSamsam911 2 жыл бұрын

they usually have horrible resolution and distortion. i dont think its a good idea

@CPPMechEngTutorials Жыл бұрын

We will be experimenting with 360 cameras for lab tours this summer!

@CPPMechEngTutorials Жыл бұрын

@@MrSamsam911 You're right. However, the more expensive 360 cameras might work. But we don't want students in the classroom to feel self-conscious about being recorded.

@devadathans5506 Жыл бұрын

I don't understand the whining about the camera here. To those who are doing that, if you bring your cursor over to the video, two thick, vertical bars will appear to the bottom left called the pause button. If you click on it, the video will freeze at that particular frame and you can take notes. Another way to do that is to press the long key called 'spacebar' on your keyboard. It also pauses the video. Imo, Professor Biddle is the most interesting part of this lecture and it is best to keep him focussed except when he is writing on the board. So, props to the camera man.

@CPPMechEngTutorials Жыл бұрын

Tell me more about this... "cursor"... you speak of. We understand the camerawork could have been better though.

@ibrahim4951 6 ай бұрын

seems like someone didn't pay attention to the class just like the camera guy. Our beloved camera man does not even show us the board where the problem is being solved smartass