3machan heat transfer chaptera naan jeekku padikka mattenda
theres a hollow sphere filled with water................the temperature outside is T(<0 C) and radius of sphere is R.........density of ice is P and thermal conductivity is k................find da time required for da entire water to freeze!!!!!!!!!!!!!!!!(assume it freezes inward)...............
(temp of water is 0 C)
-
UP 0 DOWN 0 0 5
5 Answers
3no one !!!!!!!!!!! come on give it a try!!!!!! itz quite a gud problem(easy though)!!!!!!!!
3nishant sir pls check my soln.. the buk in which i found this question has no answers!!!!!!!!!!!!
no options also!!!!!!!!!!!!!!!!!!
1i think in the ques the given density should be the density of water bcoz while writing the mass of water we need density of water not that of ice
Also here's a shorter method
Consider a sphere of radius r
amount of heat given out when Mass of water in this sphere freezes is (4/3pi r3 p)L
heat conducted by the sphere =K4pi r2 T (t) / dr
Equate them and integrate from 0 to R The ans will come out to be same