Transportation of CNTs based nanomaterial flow confined between two coaxially rotating disks with entropy generation

The mechanical characteristics of CNTs disclose them as one of the sturdiest materials in nature. CNTs are long empty graphene cylinders. Although graphene sheets have two-dimensional symmetry, CNTs by geometry have diverse characteristics in radial and axial directions. In axial directions CNTs are very strong. There are various characteristics and applications of CNTs which take full consideration of CNTs mechanical strength, aspect ratio, thermal and electrical conductivity. Keeping such proficiency of CNTs base materials in mind we here target to scrutinize entropy generation subject to CNTs in dissipative flow between two coaxially rotating disks. Viscous dissipation, heat source/sink and radiative flux are used to develop the energy equation. Main attention is given to the total entropy rate with CNTs. Nonlinear partial differential equations are converted to ordinary ones via appropriate transformations. Built-in-Shooting technique (Bvp4c) is used for solution. Flow parameters are discussed graphically. Engineering quantities like Nusselt number and surface drag force are examined numerically. Brinkman number plays a vital role in controlling the entropy rate. Rise in entropy rate is seen for increasing values of Brinkman number and radiation parameter. (C) 2019 Elsevier B.V. All rights reserved.