Boundary layer flow and heat transfer of carbon nanotube over moving plate and stretching/shrinking sheet with stability analysis
This study has been undertaken to solve numerically the boundary layer flow and heat transfer over various geometric surfaces such as horizontal and vertical moving plate, stretching/shrinking sheet and stretching/shrinking cylinder of carbon nanotubes subjected to different effects (slip, suctio...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/92819/1/FS%202021%2042%20-%20IR.pdf |
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| Summary: | This study has been undertaken to solve numerically the boundary layer flow
and heat transfer over various geometric surfaces such as horizontal and vertical
moving plate, stretching/shrinking sheet and stretching/shrinking cylinder of carbon
nanotubes subjected to different effects (slip, suction, magnetohydrodynamic,
chemical reaction). These problems took into account two types of carbon
nanotubes, namely single–wall carbon nanotubes (SWCNT) and multi–wall carbon
nanotubes (MWCNT) that were dispersed into base fluids (water and kerosene).
The governing partial differential equations were transformed into a system of
nonlinear ordinary differential equations using a similarity transformation which was
then solved numerically using a bvp4c function in MATLAB software. Numerical
results for the local skin friction and local Nusselt number, which represents the
heat transfer rate at the surface as well as velocity, temperature and concentration
profiles were presented graphically and discussed in detail. The results show that all
of the problems possessed dual solutions for a certain range of parameter, hence
a stability analysis was performed to verify the stability of the solutions. The
local skin friction, the local Nusselt number and concentration are significantly
influenced by all the parameters studied, such as the nanoparticle volume fraction,
moving parameter, slip parameter, suction parameter, mixed convection parameter,
stretching/shrinking parameter, homogeneous parameter, heterogeneous parameter,
nonlinear parameter, magnetic parameter, curvature parameter, Schmidt number and
chemical reaction parameter. It was noticed that the nanoparticle volume fraction can
increase the heat transfer rate and accelerates the cooling process. Furthermore, the
kerosene–SWCNT offers a higher heat transfer efficiency compared to other carbon
nanotubes. From the stability analysis, it was found that the first solution is stable,
while the second solution is unstable. |
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