im looking for an exact analytical solution for the following(adsbygoogle = window.adsbygoogle || []).push({});

(1/alpha) * dT/dt = d2T/dr2 + (1/r)*dT/dr

where d is actually dou(partial diff.)

subject to the boundary conditions,

a<=r<=infinity

t>=0

T=Ts (constant) at t=0;

-dT/dr + HT = H(Tf) at r=a; where H, Tf are constants

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# Heat equation

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