“…Firstly, although fluid dynamics is, nowadays, most often neglected when modeling a wall-cooled packed bed reactor [3,27,31,37,44,46,48], it is well-accepted that it impacts heat transfer mechanisms and, hence, the prediction of the temperature profiles. Navier-Stokes-Darcy-Forchheimer (NSDF) based models [5,36,38,41,42,49] or Brinkman-Darcy-Forchheimer (BDF) based models [15,50,51], including the two-zones-based models [33,52],…”