1 方=0=2 o 2rp To Where: In(分 2πk,·d Substituting Eq.(2),(3),(4)into (1), uwrip,CidTi(x) T(x)- =0 1,ln(/6) 4πk,·dk'2πk·dk 4() -((x)-) (T(x)-O) dr mn(/2) (5) u.P.C.k*2k 1+ L=uEP.C () 2kWhere: ) 2 ln( / ) 4 1 ( 2 t t b b b b b b b k r r k l = u r ρ C + 0 2 ln( / ) 4 1 ( ) ( ) 2 0 = ⋅ + ⋅ − + k dx r r k dx T x T u r C dT x t t b b b b b b b b π π π ρ k dx r r R r k r N k h h r dx R t b t cond b b b uD b b conv ⋅ = = ⋅ = ⋅ ⋅ = π π 2 ln( ) 2 2 , 2 1 Substituting Eq. (2),(3),(4) into (1), Substituting Eq. (2),(3),(4) into (1), Substituting Eq. (2),(3),(4) into (1), Substituting Eq. (2),(3),(4) into (1), b b t t b b b b b b b b l T x T k r r k u r C T x T dx dT x ( ( ) ) ) 2 ln( / ) 4 1 ( ( ) ( ( ) ) 0 2 0 − = − + − − = ρ (5)