Thermodynamic optimization of nanofluid flow over a non-isothermal wedge with nonlinear radiation and activation energy

Abstract

This paper analyses the augmentation entropy generation number for a viscous nanofluid flow over a non-isothermal wedge including the effects of non-linear radiation and activation energy. We discuss the influence of thermodynamically important parameters during the study, namely, the Bejan number, entropy generation number, and the augmentation entropy generation number. The mathematical formulation for thermal conductivity and viscosity of nanofluid for Al2O3 − EG mixture has been considered. The results were numerically computed using implicit Keller-Box method and depicted graphically. The important result is the change in augmentation entropy generation number with Reynolds number. We observed that adding nanoparticles (volume fraction) tend to enhance augmentation entropy generation number for Al2O3 − EG nanofluid. Further, the investigation on the thermodynamic performance of non-isothermal nanofluid flow over a wedge reveals that adding nanoparticles to the base fluid is effective only when the contribution of heat transfer irreversibility is more than fluid friction irreversibility. This work also discusses the physical interpretation of heat transfer irreversibility and pressure drop irreversibility. This dependency includes Reynolds number and volume fraction parameter. Other than these, the research looked at a variety of physical characteristics associated with the flow of fluid, heat and mass transfer.

Entropy analysis of slip flow second-grade Cu − EO and TiO 2 − EO nanofluids using Modified Buongiorno model

“…The working efficiency of the nanofluid augments when the entropy generation rate is low. Following [31,41,44,50], the local entropy generation rate S G for the second-grade nanofluid is:…”

“…Khan et al [30] addressed the transient Oldroyd-B nanofluid bioconvective flow considering the Buongiorno model and chemical reaction. Acharya et al [31] studied entropy generation and Arrhenius reaction energy in nanofluid flow past a wedge. The findings suggest an enhancement in entropy with surging values of Brinkman and Reynolds numbers.…”

MHD second-grade nanofluid slip flow over a stretching sheet subject to activation energy, thermophoresis, and Brownian effects

“…Viscous dissipation and elastic deformation effects are incorporated in the temperature equation. Following [22,24,25,37], the activation energy is analyzed. The present nanofluid flow geometry is illustrated in figure 1.…”

“…A low rate of entropy generation signifies less degradation of energy and improved efficiency in the system. Following [24,36,38,44], S G is expressed as:…”

“…The influence of elastic deformation and activation energy on magnetohydrodynamic flow of second-grade fluid was explored by Kalaivanan et al [23] numerically. Acharya et al [24] have examined generation of entropy and activation energy effects in nanofluid flow over a wedge under the Buongiorno framework. The results show an increase in entropy generation with higher values of Reynolds and Brinkman numbers.…”