Entropy generation in Darcy-Forchheimer bidirectional flow of water-based carbon nanotubes with convective boundary conditions

This communication investigates water-based carbon nanotubes nonlinear stretched flow embedded in Darcy-Forchheimer porous medium. Features of both single (SWCNTs) and multi (MWCNTs) walls carbon nanotubes are discussed. Heat transport mechanism are explored via heat source/sink and nonlinear thermal radiation. Total entropy generation rate is calculated. Suitable developments are through homotopy technique. Impact of thermophysical parameters on entropy generation, velocity and temperature are addressed through graphs. Furthermore the physical quantities like velocity and temperature gradients are studied graphically. Temperature and entropy generation increase for higher estimations of radiation parameter, nanoparticles fraction for both SWCNTs and MWCNTs. Entropy generation rate is prominent in case of (MWCNTs) through nanoparticles volume fraction when compared with (SWCNTs). (C) 2018 Elsevier B.V. All rights reserved.