Comment on the paper Exact coupled solution for photothermal semiconducting beams using a refined multi-phase-lag theory, Ashraf M. Zenkour [Optics and Laser Technology 128 (2020) 106233]

Abstract

This is a comment on the paper [Optics and Laser Technology 128 (2020) 106233; https://doi.org/10.1016/j.op tlastec.2020.106233] titled Exact coupled solution for photothermal semiconducting beams using a refined multi-phase-lag theory. Herein, we report a serious error in an important dimensionless parameter employed in the problem, revealing that the defined parameter is dimensional and wrong. Accordingly, all given numerical results are based on this serious mistake, and are completely erroneous.