Page 50 - programme book

FD-001
Unsteady Mixed Convection Flow Near the Stagnation Point of a Vertical Plate
Embedded in a Hybrid Nanofluid

Nurul Amira Zainal 1, 2, a) , Kohilavani Naganthran 1, b) and Roslinda Nazar 1, c)

1 Department of Mathematical Sciences,
Faculty of Science and Technology, Universiti Kebangsaan Malaysia,
43600 UKM Bangi, Selangor, Malaysia
2 Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan,
Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya,
76100 Durian Tunggal, Melaka, Malaysia

a) Corresponding author: nurulamira@utem.edu.my
a)
b) kohi@ukm.edu.my
c) rmn@ukm.edu.my

Abstract. According to previous research, examining the stagnation point flow is essential in various
industrial and technological processes, including extrusion. Thus, this numerical study aims to
investigate the behaviour of the unsteady mixed convection flow and heat transfer near the stagnation
region past a vertical plate in a hybrid nanofluid. The hybrid nanofluid employed in this study consists
of two different nanoparticles, which are alumina (Al2O3) and copper (Cu), while water (H2O) is
selected as the base fluid. By choosing an appropriate similarity transformation, the partial differential
equations are transformed into a system of linear equations, which are solved using the bvp4c function
in MATLAB software. The influence of the nanoparticle volume fraction and the unsteadiness
parameter is scrutinised. The findings revealed that the skin friction coefficient and the local Nusselt
number of the Al2O3-Cu/H2O decrease with the addition of the nanoparticle volume fraction.
Furthermore, the presence of the unsteadiness parameter reduces the momentum boundary layer
thickness. In contrast, the boundary layer thickness in the temperature profile increases as the
unsteadiness parameter improves.

Keywords: Mixed convection, unsteady flow, stagnation point, hybrid nanofluid, vertical plate

48