Meccanica (2017) 52:3009–3010 DOI 10.1007/s11012-017-0674-5 COMMENTARY TO Comment on the paper ‘‘On stagnation point ﬂow of Sisko ﬂuid over a stretching sheet, Masood Khan, Azeem Shahzad, Meccanica (2013) 48:2391–2400’’ Asterios Pantokratoras Received: 16 November 2016 / Accepted: 8 April 2017 / Published online: 19 April 2017 Springer Science+Business Media Dordrecht 2017 The present comment concerns some doubtful results where Re ; Re are the local Reynolds numbers a b included in the above paper. deﬁned as In the above paper the transformed momentum Re ¼ qxU=a ð5Þ equation solved (Eq. 16 in ) is as follows ðn1Þ 000 00 000 n 2n Af þnf ðgÞsgn 1 f ðgÞ Re ¼ qx U =b ð6Þ ð1Þ 2n d 00 02 In Eqs. (5) and (6) q is the ﬂuid density, x is the þ fðgÞf ðgÞ f ðgÞþ ¼ 0 n þ 1 c Cartesian coordinate and a; b are material parameters (Eq. 10 in ). First we substitute the free stream where A is the non-dimensional material parameter, velocity U from Eq. (2) into Eqs. (5) and (6) and then f ðgÞ is the non-dimensional ﬂuid velocity, sgn is a we substitute the local Reynolds numbers Re and
Meccanica – Springer Journals
Published: Apr 19, 2017
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