In a recent paper, work of Jordan [1] has pointed out that “measurements of Lueptow et al. [2] did not confirm the empirical expression δ/a=0.45(x/a)0.746 proposed by Afzal and Singh [3], but however supports the general consensus that the log-layer parameters converged to those of the flat plate as δ/a regardless of the specific flow conditions.” Lueptow et al. [2] also pointed out that the boundary layer thickness does not grow according to the law δ/a=0.045(x/a)0.746 proposed by Afzal and Singh [3]; see also Lueptow [4]. The discussion arose without any comparison with the data [1,2,4], who...

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