Analysis of heat transfer in the cavity with different shapes filled nanofluid in the presence of magnetic field with heat generation/absorption using LBM

Subject Areas : Heat Transfer

mohammad nemati ¹ , ramin jahangiri ² , morteza khalilian ³

1 - Department of Mechanical Engineering, Yzad University, Yazd, Iran.
2 - - Faculty of Engineering, Department of Mechanical Engineering, Urmia University, Urmia, Iran.
3 - - Faculty of Engineering, Department of Mechanical Engineering, Urmia University, Urmia, Iran.

Received: 2019-10-18 Accepted : 2020-02-17 Published : 2020-02-20

Keywords: magnetic field, Natural convection, LBM, Nanofluid, Variation of wall shape, Heat generation/absorption,

Abstract :

In this work, natural convection in a two-dimensional enclosure with different shapes filled nanofluid with heat generating/absorbing in the presence of a magnetic field is simulated by LBM. The left vertical wall of the enclosure is examined in two modes: constant temperature heating and linear temperature heating and the cold wall of the enclosure in three different forms (a) diagonal, (b) curved and (c) smooth. The effect of parameters such as Hartmann number, nanoparticle volume concentration, heat generation/absorption coefficient, cold wall shape and type of wall heating on the nature of flow and heat transfer is evaluated. The results show that in all cases, increasing the Hartmann number and heat generation/absorption coefficient decrease the Nusselt number. The effect of Hartmann number in different states is different. The highest heat transfer also occurs when the vertical wall has a constant temperature. The effect of the magnetic field is greater when the cold wall is smooth. The effect of adding nanoparticles to the base fluid on decreasing or increasing the average Nusselt number depends on the Hartmann number and heat generation/absorption coefficient.