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Comments on “Mechanism of Soret-Dufour, magnetohydrodynamics, heat and mass transfer flow with buoyancy force, and viscous dissipation effects‏‏”

Heat Transfer, ISSN: 2688-4542, Vol: 50, Issue: 2, Page: 1252-1253
2021
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This commentary shows that the correct units of mass expansion coefficient (β) must be m/mol (ie, the inverse of the concentration [C] units) so that the product β(C − C) is dimensionless in the momentum equation. Also, the correct units of magnetic field strength (B) must be Tesla so that the last term in RHS of the momentum equation has the units of m/s. In addition, the correct units of dynamic viscosity (μ) must be kg/m·s so that the last term in RHS of the energy equation has the units of K·s. These correct units must be used too in the converted momentum and energy equations after introducing the stream function Ψ(x, y). Using these wrong units will cause some dimensionless parameters such as Grashof number (Gb) and magnetic parameter (M) will be dimensional.

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