Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

Investigation of Entropy generation in Axisymmetric Stagnation Point Flow of Nano Fluid Impinging on the Cylinder With Constant Wall Temperature

Authors
mohammad mohammadiun 1
mohammad hosein dibaiee bonab 1
mohsen darabi 2
seyed reza hejazi 3
1 Department of mechanical engineering, shahrood branch, islamic azad university, shahrood, iran
2 Young Researchers and Elite Club, Shahrood Branch, Islamic Azad University, Shahrood, Iran
3 Department of mathematics, shahrood university of technology
Abstract
In this research dimensionless temperature, convection heat transfer and entropy generation for the steady state flow in the stagnation point of nanofluid impinging on an infinite cylinder have been investigated. The impinging free stream is steady with a constant strain rate . Similarity solution of the Navier-Stokes and energy equations is derived in this problem. A reduction of these equations is obtained by use of appropriate transformations introduced in this research. The general self similar solution is obtained when the wall temperature is constant. All the solutions above are presented for Reynolds numbers  ranging from 0.1 to 1000 and selected values of particle fractions where a is radius of the cylinder and is kinematic viscosity of the base fluid. Results show that for all Reynolds numbers, as the particle fraction increases, the depth of diffusion of the fluid velocity field in radial and axial directions and shear-stresses decreases whereas convective heat transfer coefficient and Nusselt number increases also maximum value of entropy generation has been calculated. 
Keywords
Nanofluid
Stagnation point flow
Similarity solution
Particle fraction
Entropy generation

Subjects

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Iranian Journal of Mechanical Engineering Transactions of ISME
Volume 21, Issue 4 - Serial Number 57
Fluid Mechanics and Heat Transfer
Winter 2020
Pages 58-34

  • Receive Date 12 October 2018
  • Revise Date 15 May 2020
  • Accept Date 16 June 2020