Impact of variable viscosity on peristaltic motion with entropy generation

Abstract

Entropy generation is a crucial aspect of every heat transfer processes. It helps to reduce irreversibility factor in a system. Entropy generation analysis is important in many conventional industrial sectors wherever heat transfer and fluid flows are involved. Therefore, present investigation addresses the analysis of entropy generation for nanofluid flow driven by peristaltic mechanism through an asymmetric channel. Governing equations included the effects of thermophoresis, mixed convection and Brownian motion. Temperature dependent viscosity is also included. Buongiorno's model for the analysis of nanofluids is employed. Mathematical modeling incorporates long wavelength approximation. Built-in numerical solver NDSolve is utilized to obtain numerical results of arising nonlinear differential equations. Analysis has been presented for temperature, Bejan number, entropy generation, concentration profile, velocity profile, heat and mass transfer rates at channel wall. Outcomes exhibit effective decrease in entropy generation and temperature with an increment in viscosity parameter. Further, velocity and rate of heat transfer at boundary increase by enhancing the values of temperature Grashoff number.