Entropy generation (irreversibility) associated with flow and heat transport mechanism in Sisko nanomaterial

Publication date: Available online 14 June 2018Source: Physics Letters AAuthor(s): M. Ijaz Khan, Tasawar Hayat, Sumaira Qayyum, Muhammad Imran Khan, A. AlsaediAbstractHere a novel applications of entropy generation optimization is presented for nonlinear Sisko nanomaterial flow by rotating stretchable disk. Flow is examined in the absence of magnetohydrodynamics and Joule heating. Total irreversibility rate (entropy generation rate) is investigated for different flow parameters. Heat source/sink and viscous dissipation effects are considered. Impacts of Brownian motion and thermophoresis on irreversibility have been analyzed. Governing flow equations comprise momentum, energy and nanoparticle concentration. Von Karman's similarity variables are implemented for reduction of PDEs into ODEs. Homotopy analysis technique for series solutions is implemented. Attention is given to the irreversibility. The impacts of different flow parameters on velocity, nanoparticle concentration, temperature and irreversibility rate are graphically presented. From obtained results it is examined that irreversibility rate enhances for larger estimation of Brinkman number and diffusion. Furthermore it is also examined that temperature and nanoparticle concentration show contrast behavior through Prandtl number and Brownian motion.

Source: Physics Letters A - July 10, 2018 Category: Physics Source Type: research