Axisymmetric stagnation point flow on linearly stretching surfaces and heat transfer: Nanofluid with variable physical properties. (April 2021)

• Record Type: Journal Article
• Authors: Alhamaly, A.S.; Khan, Majid; Shuja, S.Z.; Yilbas, B.S.; Al-Qahtani, H.
• Is Part Of: Case studies in thermal engineering. Volume 24(2021)
• Publication Date: 2021-04
• Subjects: Nanofluids -- Variable properties -- Stagnation point flow -- Stretching surfaces; Heat engineering -- Case studies -- Periodicals; 621.40205
• DOI: 10.1016/j.csite.2021.100839
• Languages: English
• ISSNs: 2214-157X

Abstract

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.