Darcy-Forchheimer flow behavior and thermal inferences with SWCNT/MWCNT suspensions due to shrinking rotating disk*

Abstract

The goal of the present investigation is to explore the flow and thermal behavior of non-Newtonian fluid with single-walled carbon nanotube (SWCNT)/multi-walled carbon nanotube (MWCNT) suspensions over a shrunk rotating disk subject to Darcy-Forchheimer effect. The mechanisms of suction, viscous dissipation and thermal radiation have been implemented. Entropy generation analysis is carried on. Innovated Nayak-Shaw number is modeled and its profiles analysis are narrated in a lucid manner. Noble bv4c method cum shooting technique is instrumental to devise a requisite numerical solution of the developed system of the dimension-free boundary layer equations. The outcomes of the study include amplification of non-Newtonian parameter (Casson parameter) that controls the radial and azimuthal motions. Inclusion of a significant interfacial nanolayer upgrades the heat transfer rate that in turn provides better cooling for industrial needs. Addition of more nanoparticles and a medium with high porosity (Darcy-Forchheimer effect) contribute to the entropy minimization which is ubiquitous for the greater efficiency of specific thermal systems. Nayak-Shaw number due to the fluid friction irreversibility peters out and that due to porous medium irreversibility ameliorates with the strengthening of porosity parameter effectively. It is obvious that the contribution of porous medium irreversibility dominates over due to fluid friction irreversibility.