Entropy generation analysis in a microchannel Poiseuille flows of nanofluid with nanoparticles injection and variable properties

摘要

In this study, a more realistic, modified Buongiorno's nanofluid model is suggested and used to examine the impact of nanoparticle injection and distribution on inherent irreversibility in a microchannel Poiseuille flow of nanofluid with variable properties. The governing nonlinear differential equations are found and solved numerically using the shooting method coupled with the Runge-Kutta-Fehlberg integration scheme. Graphical results showing the effects of the pertinent parameters on nanofluid velocity, nanoparticle concentration, skin friction, temperature, Nusselt number, Sherwood number, entropy generation rate and Bejan number are presented and discussed quantitatively. It is then found that the aggregation of nanoparticles toward the microchannel centreline region lessens the skin friction and boosts the heat and mass transfer rate. While thermophoresis of mobile nanoparticles escalates the entropy production rate, nanoparticle injection with the Brownian motion lessens it.