Investigation on thermophysical properties of Tio^sub 2^-Cu/H^sub 2^O hybrid nanofluid transport dependent on shape factor in MHD stagnation point flow

• Published in: Powder technology Vol. 322; p. 428
• Main Authors: Ghadikolaei, SS, Yassari, M, Sadeghi, H, Hosseinzadeh, Kh, Ganji, DD
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier BV 01.12.2017
• Subjects: Coefficient of friction; Computational fluid dynamics; Cylinders; Differential equations; Fluid flow; Heat transfer; Lorentz force; Magnetic fields; Magnetohydrodynamics; Mathematical models; Nanofluids; Nanoparticles; Nonlinear equations; Numerical analysis; Physical properties; Platelets; Prandtl number; Runge-Kutta method; Shape factor; Skin; Skin friction; Stagnation flow; Stagnation point; Stretching; Studies; Thermophysical properties; Titanium dioxide; Titanium oxide powders
• ISSN: 0032-5910; 1873-328X

An analysis on the subject of "induced magnetic field effect on stagnation flow of a TiO2-Cu/water hybrid nanofluid over a stretching sheet" has been carried out in this paper. It should be noted that hybrid nanofluid consists of two or more types of nanoparticles along with a base fluid and it is used to increase the heat transfer. Furthermore, the non-linear differential equations modeling this issue are included in this article. In order to solve these equations numerically, Runge-Kutta Fehlberg method is used as a numerical method in this problem. The main objective of this paper is to investigate the effects of change in parameters of stretching ratio parameter (A*), nanoparticles volumetric fractions (Ø2), magnetic parameter (β) and reciprocal magnetic Prandtl number (λ) on the functions including velocity, induced magnetic field and temperature for both Cu-water nanofluid and TiO2-Cu/water hybrid nanofluid. Also Lorentz force which is derived from magnetic field is mentioned in this section. In addition, the impacts of (Ø2), (β) and (λ) on the profiles of nanofluid and hybrid nanofluid temperature for three categories of nanoparticle shapes named brick, cylinders, and platelets are analyzed. At the end, the influences of (Ø2), (β) and (λ) on skin friction coefficient (Cf) and Nusselt number (Nux) for Cu-water nanofluid and TiO2-Cu/water hybrid fluid for different nanoparticles shapes are discussed. In all of these studies it can be seen that applying platelets shaped nanoparticles is more effective.