IIT JEE , AIEEE Forum - Physics , Thermal Physics - conic 3-d flow of heat

sonalisapal

i read in class 11and in class we have been taught in 3-d flow of heat tht we cannot calculate heat current for a cone because of its pointed nature since temperature difference at the point will be indeterminate..hence cannot apply integration ..i cud not understand this part...plzz help me out coz i knew tht wen anything varies we do integration...can u suggest me gud books which will help to strengthen my concept on thermal physics?again for cylindrical flow of heat we write H=-KAdt/dr...but A is also varying..then why dunt we write dA?my concept is not strong..plzz help me..

puneet

See, in a cone the area of the disc at any distance from the top is varying and also the rate is varying. So the integral is not a two dimensional integration. And thus the book says that the integration cannot be done. Now for the cylindrical flow the area is not varying it is a constant that is the face area of the cylinder. Ok?? Thus it is written as A.

Now good book for thermal physics, I always will make one comment use H.C Verma. It is the best book. Right ???

Take things easy and try to solve some easy questions so that it make your concepts strong before going for hard problems. Okay.

cheers

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