Theoretical Investigation of Entropy Generation in Axisymmetric Stagnation Point Flow of Nanofluid Impinging on the Cylinder Axes with Constant Wall Heat Flux and Uniform Transpiration

Dimensionless temperature, Nusselt number, and entropy generation in stagnation flow of incompressible nanofluid impinging on the infinite cylinder with uniform suction and blowing have been presented in this study. The initial stream rate of the steady free stream is k. A similar solution of Navier-Stokes and energy equations has been presented. These equations are simplified by implementing appropriate transformations introduced in this research. The governing equations are solved where the heat flux at the cylinder’s wall is constant. All these solutions are acceptable for Reynolds numbers of ۰.۱-۱۰۰۰, various dimensionless surface diffusion, and specific volume fractions of nanoparticles where a is the cylinder radius and is the kinematic viscosity of the base fluid. The results show that for all Reynolds numbers, diffusion depth of radial and axial components of velocity field and wall shear stress increases as a result of the decline in nanoparticles volume fraction and growth in surface diffusion. Moreover, an increase in nanoparticle volume fraction and surface suction raises the heat transfer coefficient and Nusselt number. Also, the greatest amount of entropy generation is calculated.

کلیدواژه ها:

Nano fluid ، stagnation flow ، Similarity solution ، volume fraction ، Entropy generation