Discussion on “Higher Order Chemical Reaction and Radiation Effects on Magnetohydrodynamic Flow of a Maxwell Nanofluid With Cattaneo–Christov Heat Flux Model Over a Stretching Sheet in a Porous Medium” (Reddy Vinodkumar, M. and Lakshminarayana, P., 2022, ASME J. Fluids Eng., 144(4), p. 041204)

The most important development in Fluid Mechanics during the 20th century was the concept of boundary layer flow introduced by Prandtl in Ref. [1]. A boundary layer is that layer of fluid which forms in the vicinity of a surface bounding the fluid. Every time a fluid moves along a surface a boundary layer near the surface appears. Therefore, boundary layers exist in the interior of water pipes, in sewer pipes, in irrigation channels, near the earth's surface, and around buildings due to winds, near airplane wings, around a moving car, at the river bottom, inside the blood vessels and so on. Therefore, it is a popular field in Fluid Mechanics for engineers, physicists, and mathematicians. Hundreds of papers are published each year in this field. However, errors appear in many papers. Four usual errors made in investigation of boundary layer flows have been analyzed by Pantokratoras in...