Viscous-dissipation effects on the heat transfer in a Poiseuille flow

Comments on “Viscous-dissipation effects on the heat transfer in a Poiseuille flow” by O. Aydin and M. Avci

“…9. In view of the above, Br e =0.5 corresponds to Br≈0.8 for which, according to Table 1 of [1], the fully developed Nusselt number should be in the range 3.185< Nu wm < 3.715 while according to Fig. 9 7.5< Nu wm <10.…”

“…(281) of [4]. In [1] there appears to be no mention of the necessity to satisfy the First Law of Thermodynamics (conservation of energy when one moves from one cross-section to another downstream cross-section; see [5][6][7][8][9]). Mainly for this reason the coefficient multiplied by Br q appearing in Eq.…”

“…Mainly for this reason the coefficient multiplied by Br q appearing in Eq. (20) of [1] differs from that of [2] and [4] as the Nusselt number of [1] reads…”

“…Another moot point is that in [1] there is no discussion of grid independence or code validation so that the reliability of the numerical results is in question.…”

“…The differential equation, Eq. (7) in [1], contains a coefficient a that does not appear in the solution, Eq. (10).…”