Equation Icon  T(0,r,z) = T ∞(r,z) + Ttr(t,r,z) ∑ [ ∑ ] = T (z) + (𝜃′ cos(κ′z) + 𝜃′′ sin (κ′′z)) J (k r), (5.25 ) s s,j j s,j j 0 s s j