( ∆ y ∆ x ) q x x + ( ∆ y ∆ x ∆ z ) qgen = ( ∆ y ∆ x ) q x x +∆ x + ( ∆ y ∆ x ∆ z ) ÷ ( ∆ y ∆ x ∆ z ) q x x q x x +∆ x d( ρ CpT ) − + qgen = dt ∆ x ∆ x De4nici-n de la deri0ada3
q x q x dq x x +∆ x − lim ÷ = − x ∆ x → ∆ x ∆ x ÷ dx
De donde3
−
∂( ρ CpT ) ∂q x + qgen = ∂ x ∂t
,stado estacionario3
∂( ρ CpT ) = ∂t 'ey de Fourier en una sola direcci-n 2e5e (*3 dT q x = − k dx
6enemos +ue3
−
d dT −k + qgen = dx dx ÷
7ntegrando3
d( ρ CpT ) dt
dT q − ∫ d ÷ + gen ∫ dx = ∫ dx dx k dT qgen x − dx ÷ + k = C )
dT qgen x + = C) dx k q dT + gen ∫ xdx = C) ∫ dx k q T + gen x / = C) x + C/ /k
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