Lecture - 10 Thermal Radiation - 1

[@chetanapatil892]

seriously... salute of your teaching skill sir...thanks to making such kind of video..it's really amazing and helpful for us...keep it up..

[@qantum251]

Outstanding great job , this is a real good maker, all the courses posted are perfect , no one is gonna stop me me now hahaha, THANKS x 10000000000000000000000000000000000000 HE SIMPLY ROCKS

[@bestcakesdesign]

What are doing now sir?

[@yourpal2250]

❤🧡💛💚 Currently doing mtech in thermal power engg...Very useful for the subject ahmt..Thanks

[@womineer]

If you find that the lectures are too slow, add closed captioning and increase speed to 1.5x its very effective for me!

[@pvsmouli7727]

tq bro this method helped me a lot mainly during my exams

[@atultripathi2952]

Yes im doing this for a year.its effective

[@bestcakesdesign]

Sorry i used 2x

[@harshtiwari491]

Thanks a lot sir.. You explained a graph very well

[@SriranganathaswamySrirangam]

Thanks Sirji

[@daramravi]

this is a very good lec ,what ihav ever heard

[@Janexho]

Excelent work Professor !!

[@aap143]

Thank you! Thank you so much for these videos! It gives crystal clear understanding of the subject. I was wondering if there are any video lectures somewhere which talk about the computation of view factors numerically. Thanks in advance :)

[@mayankrajprajapat8542]

Meta you can watch MIT lecture for this...

[@itsmevaibhavmeshram]

Thank you very much sir, i am starting to think that i can clear heat transfer by your help. Thank you a lot

[@manishkanna532]

thank u so much sir and helped to understand the basics ot t.radiation

[@indrajeetsahu1709]

Thankyou Sir! Your lecture has been helpful to me.

[@xicao1500]

thank you for uploading this. Much appreciated.

[@seanyang1104]

Thanks very much, Professor!

[@rushikeshgavande5414]

i enjoy this lecture....very effective for me...thank you

[@bestcakesdesign]

Hi, 9 yrs has been passed what do u do now?

[@rohitv1310]

extraordinary teaching

[@tutokingvideos2477]

kollam. poli sanom.

[@mechabite8033]

In radiation, the transfer of heat from one body to another body requires no transmitting medium. There are several types of electromagnetic radiations such as cosmic rays, gamma rays, x- rays, ultraviolet rays, infrared rays, etc. However, in calculation of radiation heat transfer between two bodies only thermal radiation is considered. What could be the reason? and what would be the limitations?

[@NAYAN-t3e]

Because, the thermal radiations related with heat transfer are only emitted in visible ranges of wavelength. Other radiations are not thermally radiating that much from where we can extract thermal energy. As other radiations are used for other specific applications than heat transfer because of their properties. These other radiations may injurious to health of living beings. Current context is only related to extracting & transferring this type of heat energy for thermal management systems. Other radiations has different scopes in physics & medical researches.

[@mechabite8033]

@@NAYAN-t3e what will happen if we irradiate x and gamma ray on a surface, will its temp. Increase or not, or they'll knock electrons out in their way and pass.

[@NAYAN-t3e]

@@mechabite8033 Honestly speaking, I can't answer accurately in depth but as fas as I know till now I've mentioned.....For answering your questions, it will take time for me to study in detail on this whole topic.....But due to limitations on distraction to the main course syllabus I will not enter in depth. For answering this question, better try to consult any B.Tech Physics or M.Sc. Physics person. 🙏

[@mechabite8033]

@@NAYAN-t3e okay N

[@ghulamhabib948]

as absorptivity + reflectivity +transmissivity =1 by kirchoff's law emissivity= absorptivity so emissivity +reflectivity+transmissivity =1 is it right

[@vikalpluthra5404]

Is the Thermal Radiation range from 0.1 to 10 microns or 0.1 to 100 microns? The book by Frank Incropera states the range is the later one.

[@sarveshsingh9073]

Vikalp Luthra. 0 to 100 microns

[@sarveshsingh9073]

sorry.1 to 100

[@zsharmarahul57907888]

lectures are realy good,pls sir try to cover everything on radiation in 1 lecture in minimum possible time.

[@bhuvaneshbahety8841]

amazing

[@azadehbazooband9011]

thank you

[@md.alaminmunna4096]

Great🥰

[@mechabite8033]

If we calculate radiation from sun's core, which is at a temp of 15 million kelvin, then lembda max will come under x rays . Is that also thermal radiation and is it also considered in Stefan boltzman law? And does Stefan boltzman law consider energy from thermal radiation range or the whole spectrum?

[@pritamkarmokar3674]

brilliant! thank you

[@fahadhanif6589]

Thanks sir loves from pakistan

[@mukut5ul]

How do I measure thermal radiation emitted by objects? Is there any instrument for it?

[@nitinsuryawanshi2147]

do you get your answer??

[@lucianoazevedoneves8272]

Infrared cameras or Thermographic Cameras are good devices to measure the thermal radiation without contact with the object. The sensors of these devices detect radiation emitted by the objects and transform in thermograms which you can see the temperature in each point of the image.

[@abhishekkj3662]

Bolometer

[@deeptishinde6313]

What pen do u use sir. Any version of pilot.

[@KumarHemjeet]

Yes it's pilot . Most probably v7

[@ashikraj2048]

a black body is one which absorbs completely the radiations of all wavelengths incident on it

[@MmmmDubya]

I enjoy your penmanship.

[@seanwal111111]

It's too slowly paced. I'm all in favor of a presenter of technical material making very, very sure that his presentation is not too quickly paced, and so is Prof Sukhatme. But he errs on the other side.

[@subhambarnwal7294]

in that graph what vs wavelenth gives thermal radiation

[@poonammishra8544]

Are these videos for BSC part 1?

[@mathcinema3549]

thank you ]

[@javadhikmati4941]

Where can i find these lecture notes ?

[@kartikeyjoshi2619]

Check NPTEL website.

[@dishanydey9096]

thnx sir

[@sahilrajeshgajbhiye4968]

ty very much sir

[@jitdas99]

👍

[@MrNitishDixit]

very goo help full .

[@ghulamhabib948]

what is the difference between black body and black surface

[@abcd7259]

a black body is one which absorbs all the radiation, a black body may have any color, even if a white surface can absorb all the radiation then it is called as black body. but a black surface does not necessarily mean that it should be black body.

[@sirohashalu2943]

helpful

[@AbhishekKumar-gy7pj]

Sir, Why is the unit of flux is W/m² instead of W/m³ as the direction of flux is in all the direction i.e., 3D.

[@prabhakartripathi4474]

abhishek miryala If smtng passes through area then only it is termed as flux, for volumetric or 3d case it is termed as discharge.

[@live4Cha]

God! by all respect he repeat everything many times!!!

[@nerdbodybuilder4852]

+David Zare don't see then

[@Debjit625]

Because he is trying to teach,and its for all types of students ,some takes time..

[@beardlessspirit4946]

See with double the speed, that would do! :D

[@PedroHernandez-gz4cn]

LIKE

[@rahulSHARMA-bt3go]

speed*

[@BhawaniNandan-lj9um]

Worstj lecture

[@mscreator7795]

thanks a lot sir i am satisfied of your lecture ,its a very interesting lecture of radiation