# Thermal Stability and Entropy Generation Analysis for
## 6 Conclusions  
In this article, the entropy generation analysis of a steady flow of a reactive variable-viscosity third-grade fluid through a slant porous-medium saturated channel with asymmetrical slippage and isothermal conditions was successfully carried out with the aid of SCCM. The numerical method was found to be highly accurate and convergent. A graphical analysis of the response of the velocity and temperature distribution, entropy generation rate, and irreversibility ratio to the various parameters embedded in the flow system revealed the following:  
* The non-Newtonian properties of the fluid and the porous-medium shape factor parameter have a damping effect on the fluid velocity, while the buoyancy forces were observed to have the opposite effect;
* The fluid temperature profile was observed to increase with an increase in the temperature-dependent viscosity, the viscous heating parameter, the activation energy parameter, the buoyancy force, and the chemical reaction parameter, whereas the third-grade material parameter had a retardation effect;
* A parabolic entropy generation rate profile was observed, with minimum entropy \(Ns=0\) at the channel core region;
* Parameters either increase or decrease the entropy generation rate elsewhere in the channel, but, at the core region of the channel, it remained unaffected by all the parameters except the chemical reaction parameter, the activation energy parameter, buoyancy, and porous-medium permeability;
* The irreversibility ratio was observed to be minimum at the channel core region, indicating the dominance of the combined viscous dissipation and porosity irreversibility over heat transfer irreversibility;
* Elsewhere in the channel, parameters revealed varied effects on the Bejan number but, in general, irreversibility due to viscous dissipation and porosity was found to dominate heat transfer irreversibility at the core region of the channel. Heat transfer irreversibility was, in general, dominant near the channel walls and in the bulk of the fluid further from the core region. These observed interesting manifestations will no doubt inform optimal system regulation criteria for entropy generation minimization in thermo-mechanical systems to achieve energy utilization efficiency.  
There is growing demand for economical and maintainable systems across the globe. Most industrial and engineering flow processes and thermal systems are unable to work at optimal levels due to entropy generation. Since entropy generation is a measure of the destruction of the accessible work of the systems, the determination of entropy generation is thus extremely vital for upgrading system performance. Our study is a theoretical model through which the factors (or parameters) that contribute to entropy generation can be identified so that their effects can be minimized through intelligent regulation so that the flow system efficiency can be maximized. Moreover, with the global technological advancements of non-Newtonian fluids, the theoretical results will provide guidance on improving, conserving, and upgrading several designs in industrial thermo-fluid systems.  
Conceptualization, L.R.; methodology, P.O.B.; software, S.O.A.; validation, P.O.B.; formal analysis, K.F.T.; writing, L.R.; review and editing, S.O.A.; funding acquisition, K.F.T. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
The raw data supporting the conclusions of this article will be made available by the authors on request.  
The authors declare no conflicts of interest