The forced convection of alumina-water nanofluid over three staggered circular cylinder on the effect of magnetic field

Subject Areas : Vibration Transmision

Amin Nikelham ¹ (Department of Mechanical Engineering, North Tehran Branch, Islamic Azad University, Tehran, Iran)
Vali Enjilela ² (Department of Mechanical Engineering, Karaj Branch, Islamic Azad University, Karaj, Iran)
Nima Vaziri ³ (Department of Physics, Karaj Branch, Islamic Azad University, Karaj, Iran)
Zahra Poolaei Moziraji ⁴ (Department of Mechanical Engineering, North Tehran Branch, Islamic Azad University, Tehran, Iran)

Received: 2021-02-23 Accepted : 2021-05-12 Published : 2021-06-10

Keywords: magnetic field, Nanofluid, Forced Convection, Angles of magnetic field, Three staggered circular cylinder,

Abstract :

In the present study, the forced convection of alumina-water nanofluid over three staggered circular cylinder inside a magnetic field is investigated. The Navier Stokes and the energy equations are discretized using the finite elements method. An experimental model as a function of temperature, the nanoparticles diameter, and the volume fraction of the nanofluid is utilized for calculating the viscosity and the conductivity coefficient of the nanofluid. The ranges of the main parameters, including the Reynolds numbers, the Hartman numbers, the volume fractions of the nanofluid and the angles of magnetic field are 100≤Re≤200, 0≤Ha≤100, 0≤fe≤0.06 and gama=0ᵒ,90ᵒ, respectively. The results of the stream lines, the average Nusselt number of the first and the second rows of tubes and the average Nusselt number of the three circular cylinders are presented and discussed. The results show that using of the nanoparticles increases the heat transfer. Also, utilizing of the magnetic field causes flow discipline and initially reduces the heat transfer; but with increasing of the magnetic field, the heat transfer increases.