Abstract
The similarity variable (η) is dependent only on z. From the energy and concentration equations, the temperature (T) and concentration (C) are dependent on r, z. Also, the temperature θ(η) is dependent only on z whereas the other term is dependent on r, z. Thus, there is a contradiction between the 2 terms so that the temperature equation is invalid. In addition, the concentration ϕ(η) is dependent only on z whereas the other term is dependent on r, z. Thus, there is a contradiction between the 2 terms so that the concentration equation is invalid. Furthermore, the Rg parameter in mass transfer irreversibility in the Sgen''' expression is not defined.
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