3. For steady incompressible laminar flow through a long tune, the velocity distribution is given by, v₂ = U (1 - 12²); v₁ = v₁ = 0 Where U is the maximum, or centerline, velocity and R is the tube radius. If the wall temperature is constant at Tw and temperature T=T(r) only, find T(r) for this flow provided following energy conservation equation satisfy this flow. PCv vr dT dr = 2 k d dT +μ rc dr dv Z dr (5 marks)