Corrigendum

This article refers to:

UNSTEADY MIXED CONVECTION WITH SORET AND DUFOUR EFFECTS PAST A POROUS PLATE MOVING THROUGH A BINARY MIXTURE OF CHEMICALLY REACTING FLUID

Article title: “Unsteady Mixed Convection with Soret and Dufour Effects Past a Porous Plate Moving through a Binary Mixture of Chemically Reacting Fluid”

Authors: O. D. Makinde and P. O. Olanrewaju

Journal: Chemical Engineering Communications

Bibliometrics: Volume 198, Issue 7, pages 920–938

DOI: 10.1080/00986445.2011.545296

This write-up presents a corrigendum on Makinde and Olanrewaju (2011), and upholds the mathematical correctness of the results in the published article. However, the intention is also to correct the misprint that appears in the published article. Firstly, using dimensionless variables in the paper, the following dimensionless parameters: thermal Grashof number (Gr), solutal Grashof number (Gc), Soret number (Sr) and Dufour number (Du) can be obtained as

(1)

where the units are given as

[t] = sec (time)

[g] = m (length) sec⁻² (time⁻²)

[U₀] = m (length) sec⁻¹ (time⁻¹)

[β] = Kelvin⁻¹(temperature⁻¹)

[β_c] = (Concentration⁻¹)

[k_T] = (Concentration)

[υ] = m² (length²) sec⁻¹(time⁻¹)

[T_∞] = Kelvin (temperature)

[T_m] = Kelvin (temperature)

[C_∞] = (Concentration)

[D] = m²(length²) sec⁻¹ (time⁻¹)

[c_s] = m⁻²(length⁻²) sec²(time²) (Concentration²) and this implies that [Gr] is dimensionless, [Gc] is dimensionless, [Sr] is dimensionless, and [Du] is dimensionless. Meanwhile, under the dimensionless parameters in Makinde and Olanrewaju (2011), a misprint of additional υ is observed in the expression for Gr and Gc, also a misprint of additional ρ in expression for Du and a misprint of ρ replace υ in Sr, however, these minor misprints does not affect the obtained dimensionless governing equations in the published paper (Makinde and Olanrewaju, 2011); i.e.

(2)

(3)

(4)

with

(5)

(6)

where the prime symbol denotes differentiation with respect to η, b is the heat generation parameter, Pr is the Prandtl number, Sc is the Schmidt number, Da is the Damköhler number, Ra is the radiation parameter, γ is the activation energy parameter, Gr is the local thermal Grashof number, Gc is the local solutal Grashof number, Sr is the Soret number and Du is the Dufour number. The numerical results displayed in Makinde and Olanrewaju (2011) for the flow characteristics together with heat and mass transfer are based on the analysis of the above correctly obtained dimensionless model equations (2)–(6). Finally, we emphasize that Makinde and Olanrewaju (2011) is correct in formulation, analysis, solution, and discussion.

Acknowledgment

The author gratefully acknowledges the contribution of A. Pantokratoras in pointing out the typo-misprint in the original manuscript.