Heat Transfer of Ag-Al₂O₃/Water Hybrid Nanofluid on a Stagnation Point Flow over a Stretching Sheet with Newtonian Heating

Abstract

The present study investigated the flow and heat transfer at a stagnation point past a stretching sheet. The premium silver nanoparticles Ag and economic alumina nanoparticles Al2O3 suspended in water to form Ag-Al2O3/Water hybrid nanofluid are numerically examined. The analysis started with transforming the mathematical model which is in non-linear partial differential equations to a more convenient form by similarity transformation approach before being solved numerically using the Runge-Kutta-Fehlberg (RKF45) method. The characteristics and effects of the stretching parameter, conjugate parameter and the nanoparticle volume fraction for Al2O3 and Ag on the variation of wall temperature, heat transfer coefficient and reduced skin friction coefficient are analyzed and discussed.

Mixed Convection Boundary Layer Flow over a Horizontal Circular Cylinder in AL2O3-Ag/Water Hybrid Nanofluid with Viscous Dissipation

“…The symbol 𝜇 ℎ𝑛𝑓 represents the dynamic viscosity of a hybrid nanofluid, while 𝜌 ℎ𝑛𝑓 denotes the density of the hybrid nanofluid. The variable 𝑔 represents the acceleration due to gravity, 𝛽 ℎ𝑛𝑓 represents the thermal expansion coefficient of the hybrid nanofluid, 𝑇 represents the local temperature, (𝜌𝐶 𝑝 ) ℎ𝑛𝑓 is the heat capacity of hybrid nanofluid, 𝑣 ℎ𝑛𝑓 is the kinematic viscosity of hybrid nanofluid and 𝑘 ℎ𝑛𝑓 is the thermal conductivity of hybrid nanofluid which can be expressed from the previous study [18,21,22]:…”

Irreversibility scrutinization on EMHD Darcy–Forchheimer slip flow of Carreau hybrid nanofluid through a stretchable surface in porous medium with temperature‐variant properties

“…Other unknown variables together with their corresponding derivatives are approximated using the similar approach. Using the definition given in Equations ( 28)- (30), the decoupled linearized systems ( 21)-( 23) in matrix form becomes…”

“…29 Later on, several scholars used the theory of NFs to extend the analysis of flow and heat transfer features over stretching surfaces. Mohamed et al 30 added silver and alumina NPs onto water when investigating stagnation point flow and heat transmission over a stretchable surface. They disclosed that hybrid NF temperature and rate of heat transference dwindle with escalating stretching parameters but enhance when alumina NPs are added to silver NF.…”

Soret-Dufour Effects on The Waterbased Hybrid Nanofluid Flow with Nanoparticles of Alumina and Copper

“…However, another types of nanoparticles (differed from the mixture of Al 2 O 3 and Cu) in a hybrid nanofluid have been described, which is affected viscous dissipation. These study relate to the mixture of silver (Ag) and copper (Cu) [24], iron oxide (F e 3 O 4 ) and cobalt ferrite (CoF e 2 O 4 ) [42], copper (Cu) and iron oxide (F e 3 O 4 ) [30], and silver (Ag) and alumina (Al 2 O 3 ) [33].…”