Numerical and statistical analysis of boundary layer flow and heat transfer in hybrid nanofluid over various permeable surfaces
This thesis presents the studies on hybrid nanofluid flowover various permeable surfaces and conditions. Five different flow problems consisting of unsteady hybrid nanofluid flowpast a permeable Riga plate with thermal radiation and convective boundary condition, mixed convection hybrid nanofluid...
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| Format: | Thesis |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/118427/ http://psasir.upm.edu.my/id/eprint/118427/1/118427.pdf |
| Summary: | This thesis presents the studies on hybrid nanofluid flowover various permeable surfaces
and conditions. Five different flow problems consisting of unsteady hybrid nanofluid
flowpast a permeable Riga plate with thermal radiation and convective boundary condition,
mixed convection hybrid nanofluid flow past a permeable non-isothermal cone and
wedge with thermal radiation and convective boundary condition, hybrid nanofluid flow
past a permeable biaxial stretching/shrinking surface with thermal radiation, oblique
stagnation-point flow of hybrid nanofluid towards a permeable shrinking surface, and
magnetohydrodynamics (MHD) stagnation-point flow of ternary hybrid nanofluid over
a permeable radially shrinking disk with thermal radiation, viscous dissipation, and
convective boundary condition are solved, analyzed, and discussed. The geometries
and governing conditions of these flow problems are defined using partial differential
equations and boundary conditions. Then, similarity transformation reduced these
equations into non-linear ordinary differential equations before being solved numerically
using the bvp4c solver in MATLAB. Multiple solutions are found within certain
ranges of unsteadiness, mixed convection, and stretching/shrinking parameters. However,
stability analysis confirms that only the first solution is stable while the others
are unstable. The numerical results show that hybrid nanofluid and ternary hybrid
nanofluid improve the physical quantities of interest, namely the local skin friction
coefficient and Nusselt number. Nevertheless, in some cases where boundary suction
is applied, hybrid nanofluids may have a lower local Nusselt number than nanofluids.
Increasing the suction parameter can help compensate for this reduction in heat transfer
performance. The imposition of thermal radiation and convective boundary condition
also increases the local Nusselt number. Additionally, the assisting mixed convection
flow exhibits a higher local skin friction coefficient and Nusselt number than the opposing
flow. Finally, response surface methodology (RSM) is employed to determine
the significance and optimal settings of the controlling parameters on the local Nusselt
number. Generally, the highest value of the suction parameter maximizes the local
Nusselt number and improves the heat transfer rate at the surface. |
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