Re, = critical value of Re Reic = Re, for 2 = F1 Reoc = Re, for F = F2 u = axial velocity component = average of u v = velocity vector Greek Symbols V = gradient operator A = value of 6 for which velocity is maximum = viscosity = r / R o = value of t at which K is maximum = value of 5 for r 6 t1 4 A = value of F for A L z2 4 1 --& 82 p = density -u = annulus aspect ratio, Ri/Ro 4 = 1 + u2 -2A2
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