Effects of inlet velocity profiles of hybrid nanofluid flow on mixed convection through a backward facing step channel under partial magnetic field

Geridönmez B., Oztop H. F.

CHEMICAL PHYSICS, cilt.540, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 540
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.chemphys.2020.111010
  • Dergi Adı: CHEMICAL PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chemical Abstracts Core, INSPEC
  • Anahtar Kelimeler: Partial magnetic field, Mixed convection, Radial basis functions, Hybrid nanofluid, Backward facing step, HEAT-TRANSFER, NUMERICAL-SIMULATION, THERMAL PERFORMANCE, ENTROPY GENERATION, NATURAL-CONVECTION, TWISTED-TAPE, CAVITY, LAMINAR, INCLINATION, CYLINDERS
  • TED Üniversitesi Adresli: Evet

Özet

In this paper, mixed convection flow of a hybrid nanofluid is numerically studied in a backward facing step channel in the presence of a uniform partial magnetic field. Four different inlet velocity profiles are also taken into account. Stream function-vorticity formulation of governing dimensionless equations is adopted. The radial basis function pseudo spectral method for spatial derivatives and the backward-Euler method for time derivatives are implemented on nonuniform grids for numerical simulation of the problem. The influence of Hartmann number (between 0 and 50), Richardson number (between 0.01 and 100), the center of partial magnetic field (between 1 and 3) and the solid nanoparticle concentrations (between 0.01 and 0.04) are numerically examined. The results reveal that the smallest convective heat transfer is achieved in the step-centered partial magnetic field. The increase in magnetite nanoparticles has a significant influence on convective heat transfer, particularly, in case of sinusoidal velocity profile.