Physics 24.1 Variable Heat Transfer (20 of 25) Cylindrical Wall Conductivity

In this video I will find the general equation of the heat transfer per unit time, dQ/dt=?, across a wall of a cylinder where the inside temperature is greater than the outside temperature.

Next video in this series can be seen at:

[Tutor_Jose_physics_math_engine]

You'll teach for generations, my friend.. you tube and science should congrat you for that!!

[mahad]

Thank you sir, I was very confused about what area and length should be taken for its elemental form but you have cleared it.

[ABHISHEKSHARMA-mtcf]

Concept booster video sir🔥🔥🔥... Thanks a lot... From India

[JamesVestal-dzqm]

Sayandeep is right that I have OCD attacks when I poop in the middle of the day. I am still vaping nicotine and suffering from OCD, but I am speeding up in chemical engineering. I did the transport and reactors homework a few times to learn from my mistakes, and I re read my own notes to understand errors in my own thinking. I labeled him Dmitri the illustrious, the chosen gucci boy for all the females to save his life. I knew that Shana banana was one of my accusers, but she didn't have the street smarts to land it in the school.

[morrel]

How can dQ/dt remain constant if there is heat transfer through the pipe. Wouldn't the temperature inside the pipe change with time therefore making dQ/dt variable and not constant?

[PACO_MAX]

Hi! When you say that dQ/dt is constant, you mean that heat flux doesn't change with time? or that the heat flux is uniform in all the surface? thanks!

[tasnimultanim]

great sir👍
Thank you from Bangladesh.

[eirikschjlset]

Tanku botie man, always can rely on you
😍🥰

[Az-yxb]

1:17 will the area be calculated using the radius of the inner wall of the pipe or the radius of the outer wall of the pipe? Been confused about this for a long time

[xqwiuhm]

I'm little bit confused the formula are teacher gave us is a little bit different

[mostafaabdelrauof]

hello sir can you help me in a case which an insulated pipe and fluid inside it and heat transfer with the surrounding air, And I have calculated the heat loss rate already but can't calculate the final temp. !!?

[luqman]

Thank You for the video. could you help to calculate heat transfer for double wall cup. Thank You.

[pikulicluka]

Now that's what I call an intuitive, clear and accessible explanation! Thank you for making these terrific videos!
I've got one question though: what if the temperature outside (T_b in this case) is higher than the temperature inside the hollow cylinder (T_a)? I reckon the derivation is similar, except there's no minus sign in front of the thermal conductivity k?
Also; why did the L-term disappear in the infinitesimal shell dQ/dt formula and get replaced by a dr-term? The dr-term is not a substitute for the length L, it's in a wholly different direction.

[sammalik]

Does metal melt in variable state? If yes Then how it will be possible at constant temperature

[awoldn]

Could Please show how estimate dQ/dt if k is a variable value like for real insulation?

[utkarshiitbhu]

Sir on making smaller radius 0
Will it result in infinite thermal resistance?

[guenheejunheelee]

Sir, Do you have any plans to cover PTC (Positive Temperature Coefficient) heater for your heat transfer-related lectures?

[Robin-smum]

He sounds like Gru from despicable me hahahha