Abstract
Electrodiffusional methods of studying unsteady turbulent mass transfer involved measurement of a transient current characteristicI(τ) after step polarization of a rotating annular cylindrical 46 mm dia electrode at a fixed rotational velocity atRe=(2–9)×104 andSc=2.4×103. The potassium ferri-ferrocyanide system with NaOH background electrolyte was used. An initial asymptote at τ→0 served as a test. The similarity of the normalized transfer coefficientK +=β/u * with respect to the Reynolds number demonstrated turbulent flow development. Tests were aimed at determining the powern in the approximate law of attenuation of turbulent diffusionD t in they-direction normal to the wallD t/v=by + n .A numerical solution of the unsteady turbulent diffusion equation obtained as a set of lg Δ(ξ)=f(ξ) curves for 3≤n≤4 with an interval 0.2, where Δ(ξ)=I/I(ξ)ξ→α#x2212;1 has been achieved.
Published Version
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