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Discussion Response Post to: heat current...plz help

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13 May 2007 23:39:16 IST

Subject: Re:heat current...plz help

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akku (1142)

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Hi ramya,
FOR RADIAL FLOW OF HEAT

H=Q/t= -kAdt/dx
Let there b a cylindrical element @ distance r frm axis of cylinder
H.dr= -k (2

rl)dT
Hdr/r= -k2

ldT
now integrate both sides from r1 to r2 and t1to t2
H=k2

l(t1-t2)/ln(r2/r1) where ln=natural log= log base e

FOR AXIAL FLOW OF HEAT
H=K

(r2^2-r1^2)(t1-t2)/l

PLS RATE !

this reply: 10 points (with 2 Olaaa!! Perrrfect answer.

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