Influence of the Periodicity of Sinusoidal Boundary Condition on the Unsteady Mixed Convection within a Square Enclosure Using an Ag–Water Nanofluid

Abstract

Abstract:A numerical study of the unsteady mixed convection heat transfer characteristics of an Ag-water nanofluid confined within a square shape lid-driven cavity has been carried out. The Galerkin weighted residual of the finite element method has been employed to investigate the effects of the periodicity of sinusoidal boundary condition for a wide range of Grashof numbers (Gr) (10 5 to 10 7 ) with the parametric variation of sinusoidal even and odd frequency, N, from 1 to 6 at different instants (for τ = 0.1 and 1). It has been observed that both the Grashof number and the sinusoidal even and odd frequency have a significant influence on the streamlines and isotherms inside the cavity. The heat transfer rate enhanced by 90% from the heated surface as the Grashof number (Gr) increased from 10 5 to 10 7 at sinusoidal frequency N = 1 and τ = 1.

Obstacle's effects and their location inside the square cavity on the thermal performance of Cu–Al2O3/H2O hybrid nanofluid

“…In their work, Hussain et al 19 focused on the length and spacing of fins while examining the impact of utilizing fins and inclined magnetic fields within lid‐driven and double lid‐driven cavities filled with nanofluids. Karim et al 20 looked at how a sinusoidal boundary condition's periodicity affected the Ag–water nanofluid's ability to transport heat in an unstable mixed convection environment while being contained within a lid‐driven cavity with a square form. Using a Buongiorno model, Garoosi et al 21 examined the mixed convection heat transfer of a nanofluid in a lid‐driven cavity flow.…”

A numerical investigation of the effect of sinusoidal temperature on mixed convection flow in a cavity filled with a nanofluid with moving vertical walls

“…Several investigations involving square cavities and enclosures of various sizes and aspect ratios have been carried out. [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] Several researchers conducted a study on mixed convection inside cavities that were sinusoidal-heated, wherein Karim et al 38 conducted a numerical study of the unsteady mixed convection heat transfer properties of Ag-water nanofluids confined within a lid-driven square cavity with a sinusoidal heated bottom wall, according to the results the lower values of the parametric variation of sinusoidal even and odd frequency support enhanced heat transfer through convection and conduction.…”

The Effects of Hot Blocks Geometry and Particle Migration on Heat Transfer and Entropy Generation of a Novel I-Shaped Porous Enclosure

“…A sinusoidal boundary condition in a square cavity involving a water-based NF was investigated numerically by Karim et al [31]. The impact of a sinusoidal boundary condition on the NF combined convection inside a square cavity implementing a waterbased NF was numerically investigated by Karim et al [31]. They applied the FVM to examine the influence of the boundary condition on cooling performance.…”