Comment on "Similarity analysis in magnetohydrodynamics: effects of Hall and ion-slip currents on free convection flow and mass transfer of a gas past a semi-infinite vertical plate," A.A. Megahed, S.R. Komy, A.A. Afify

TL;DR

This paper critiques a previous study on magnetohydrodynamic boundary layer flow, highlighting two fundamental errors in their numerical analysis of Hall and ion-slip effects on free convection flow.

Contribution

It identifies and discusses two fundamental errors in the prior numerical analysis of Hall and ion-slip effects in MHD boundary layer flow.

Findings

Two fundamental errors in the previous numerical analysis.

Implications for the accuracy of prior results.

Importance of correct transformation and solution methods.

Abstract

Comment on Similarity analysis in magnetohydrodynamics:effects of Hall and ion-slip currents on free convection flow and mass transfer of a gas past a semi-infinite vertical plate, A.A. Megahed, S.R. Komy, A.A. Afify [Acta Mechanica 151, 185-194 (2001)] In the above paper is investigated the boundary layer flow of an electrically conducting fluid over a vertical, stationary plate placed in a calm fluid. The effects of Hall and ion-slip currents are taken into account. The boundary layer equations are transformed into ordinary ones using a scaling group of transformations and subsequently are solved numerically. However, there are two fundamental errors in the above paper which are presented below.