Axisymmetric stagnation point flow on linearly stretching surfaces and heat transfer: Nanofluid with variable physical properties

A. S. Alhamaly, Majid Khan, S. Z. Shuja, B. S. Yilbas*, H. Al-Qahtani

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Stagnation point flow on a linearly stretching surface is considered and heat transfer analysis incorporating nanofluid with variable properties is presented. In the analysis, the stretching surface is considered to be extending radially while the extended surface is heated convectively. The nanofluid physical properties are taken to be a function of volume fraction of the constituting nanoparticles and their distribution within the flow boundary layer is also incorporated. The governing equations of momentum, energy, and species (nanoparticle concentration) are formulated in line with the Buongiorno model. The resulting equations are reduced to three coupled nonlinear ordinary differential equations via using the similarity transformations. The transformed equations are solved numerically adopting the appropriate boundary conditions. The findings reveal that incorporating the variable properties of the nanofluid in the governing equations results in larger heat transfer rates as compared to those corresponding to the homogenous property fluid. This is more pronounced for large volume fractions of nanoparticles within the region of the boundary layer. In addition, Prandtl number, stretching rate of the surface, and nanoparticles volume fraction significantly influence the Nusselt number.

Original languageEnglish
Article number100839
JournalCase Studies in Thermal Engineering
Volume24
DOIs
StatePublished - Apr 2021

Bibliographical note

Publisher Copyright:
© 2021 The Author(s).

Keywords

  • Nanofluids
  • Stagnation point flow
  • Stretching surfaces
  • Variable properties

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Fluid Flow and Transfer Processes

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