Unsteady flow of variable viscosity Cu-water and Al2O3-water nanofluids in a porous pipe with buoyancy force
S Khamis, DO Makinde… - International Journal of …, 2015 - emerald.com
S Khamis, DO Makinde, Y Nkansah-Gyekye
International Journal of Numerical Methods for Heat & Fluid Flow, 2015•emerald.comPurpose–The purpose of this paper is to investigate the combined effects of buoyancy force
and variable viscosity on unsteady flow and heat transfer of water-based nanofluid
containing copper and alumina as nanoparticles through a porous pipe.
Design/methodology/approach–Using the Boussinesq and boundary-layer approximations
with Buongiorno nanofluid model. The governing nonlinear partial differential equations for
the continuity, momentum and energy balance are formulated. The equations obtained are …
and variable viscosity on unsteady flow and heat transfer of water-based nanofluid
containing copper and alumina as nanoparticles through a porous pipe.
Design/methodology/approach–Using the Boussinesq and boundary-layer approximations
with Buongiorno nanofluid model. The governing nonlinear partial differential equations for
the continuity, momentum and energy balance are formulated. The equations obtained are …
Purpose
– The purpose of this paper is to investigate the combined effects of buoyancy force and variable viscosity on unsteady flow and heat transfer of water-based nanofluid containing copper and alumina as nanoparticles through a porous pipe.
Design/methodology/approach
– Using the Boussinesq and boundary-layer approximations with Buongiorno nanofluid model. The governing nonlinear partial differential equations for the continuity, momentum and energy balance are formulated. The equations obtained are solved numerically using a semi-discretization finite difference method (know) as method of line coupled with Runge-Kutta-Fehlberg integration scheme.
Findings
– Numerical results for the skin-friction, heat transfer and for the velocity and temperature profiles are obtained. The results show that with suction, Cu-water produces higher skin friction and heat transfer rate than Al2O3-water. Both nanofluids velocity and temperature increase with a decrease in viscosity and an increase in buoyancy force intensity.
Practical implications
– Buoyancy-driven flow and heat transfer in porous geometries has many significant applications in industrial and engineering such as, electrical and microelectronic equipments, solar-collectors, geothermal engineering, petroleum reservoirs, thermal buildings insulation. This work provides very important information for researchers on this subject.
Originality/value
– This paper illustrates the effects of buoyancy force and temperature dependent on heat transfer and fluid flow problem using Cu-water and Al2O3-water nanofluids in a porous pipe.
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