Investigation on thermophysical properties of Tio2–Cu/H2O hybrid nanofluid transport dependent on shape factor in MHD stagnation point flow

• Published in: Powder technology Vol. 322; pp. 428 - 438
• Main Authors: Ghadikolaei, S.S., Yassari, M., Sadeghi, H., Hosseinzadeh, Kh, Ganji, D.D.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2017
• Subjects: differential equation; friction; heat transfer; Hybrid nanofluid; Lorentz force; magnetic fields; nanofluids; nanoparticles; Nusselt number (Nu); powders; Runge-Kutta-Fehlberg method; Skin friction coefficient(Cf); Stagnation point flow; temperature; titanium dioxide; Stagnation point flow; Runge-Kutta-Fehlberg method; Lorentz force; Skin friction coefficient(Cf); Nusselt number (Nu); Hybrid nanofluid
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2017.09.006

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 (∅2), 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 (∅2), (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 (∅2), (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. [Display omitted] •TiO2‐Cu/H2O hybrid nanofluid is incorporated.•Analysis of thermal conductivity of hybrid nanofluid is highlighted.•Different shape factors for nanoparticles are addressed.•Nonlinear differential equations are solved numerically.