Boundary layer flow, heat and mass transfer over a stretching or shrinking surfaces in a nanofluid
The purpose of this study is to solve five different problems focused on the nanofluid model, Tiwari-Das model (2007) and related to the steady laminar free and mixed convection boundary layer flow on a linear, exponential, or nonlinear stretching or shrinking surface in a nanofluid. This study c...
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| Format: | Thesis |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/118246/ http://psasir.upm.edu.my/id/eprint/118246/1/118246.pdf |
| _version_ | 1848867752135098368 |
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| author | Ahmad Kardri, Mahani |
| author_facet | Ahmad Kardri, Mahani |
| author_sort | Ahmad Kardri, Mahani |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The purpose of this study is to solve five different problems focused on the nanofluid
model, Tiwari-Das model (2007) and related to the steady laminar free and mixed
convection boundary layer flow on a linear, exponential, or nonlinear stretching or
shrinking surface in a nanofluid. This study considers flow that occurs over a flat
surface or at the top of a cylinder. Three types of nanoparticles, namely copper, alumina,
and titania, were investigated. The governing partial differential equations are
reduced into nonlinear ordinary differential equations using the similarity transformation
technique. The system of equations will then be numerically solved using the
bvp4c solver in MATLAB software. The present study was validated by comparing it
to previous literature and found to be in good agreement. The influence of governing
parameters, including stretching or shrinking, nanoparticle volume fraction, curvature,
suction, mixed convection, first-order and second-order velocity slip, chemical
reaction, buoyancy ratio, magnetic field, Soret number, Dufour number, nonlinear
parameter, radiation, heat generation, and Eckert number, are analyzed. The physical
quantities of interest are the skin friction coefficient, Nusselt and Sherwood numbers,
velocity, temperature, and concentration profiles, which are presented graphically for
further discussion. A certain range of solutions reveals the existence of dual solutions.
The stability analysis has been performed to determine which solutions are
linearly stable and physically reliable. Dual solutions exist within a certain range
of solutions. Copper has the highest thermal conductivity compared to alumina and
titania. The lowest skin friction coefficient goes to alumina, while titania is for the
lowest heat transfer. Increases in the skin friction coefficient and heat transfer rate
reduced the values of the suction parameter, while there was an increase in the magnetic
field parameter, nanoparticle volume fraction, and slip parameters. An increase
in the nanoparticle volume fraction helps to increase the chemical reaction parameter.
The upper branch solution was found to be stable by stability analysis performed
in two problems of study, while the lower branch solution was unstable. |
| first_indexed | 2025-11-15T14:41:29Z |
| format | Thesis |
| id | upm-118246 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T14:41:29Z |
| publishDate | 2023 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-1182462025-08-04T03:38:23Z http://psasir.upm.edu.my/id/eprint/118246/ Boundary layer flow, heat and mass transfer over a stretching or shrinking surfaces in a nanofluid Ahmad Kardri, Mahani The purpose of this study is to solve five different problems focused on the nanofluid model, Tiwari-Das model (2007) and related to the steady laminar free and mixed convection boundary layer flow on a linear, exponential, or nonlinear stretching or shrinking surface in a nanofluid. This study considers flow that occurs over a flat surface or at the top of a cylinder. Three types of nanoparticles, namely copper, alumina, and titania, were investigated. The governing partial differential equations are reduced into nonlinear ordinary differential equations using the similarity transformation technique. The system of equations will then be numerically solved using the bvp4c solver in MATLAB software. The present study was validated by comparing it to previous literature and found to be in good agreement. The influence of governing parameters, including stretching or shrinking, nanoparticle volume fraction, curvature, suction, mixed convection, first-order and second-order velocity slip, chemical reaction, buoyancy ratio, magnetic field, Soret number, Dufour number, nonlinear parameter, radiation, heat generation, and Eckert number, are analyzed. The physical quantities of interest are the skin friction coefficient, Nusselt and Sherwood numbers, velocity, temperature, and concentration profiles, which are presented graphically for further discussion. A certain range of solutions reveals the existence of dual solutions. The stability analysis has been performed to determine which solutions are linearly stable and physically reliable. Dual solutions exist within a certain range of solutions. Copper has the highest thermal conductivity compared to alumina and titania. The lowest skin friction coefficient goes to alumina, while titania is for the lowest heat transfer. Increases in the skin friction coefficient and heat transfer rate reduced the values of the suction parameter, while there was an increase in the magnetic field parameter, nanoparticle volume fraction, and slip parameters. An increase in the nanoparticle volume fraction helps to increase the chemical reaction parameter. The upper branch solution was found to be stable by stability analysis performed in two problems of study, while the lower branch solution was unstable. 2023-06 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/118246/1/118246.pdf Ahmad Kardri, Mahani (2023) Boundary layer flow, heat and mass transfer over a stretching or shrinking surfaces in a nanofluid. Doctoral thesis, Universiti Putra Malaysia. http://ethesis.upm.edu.my/id/eprint/18366 Nanofluids Boundary layer (Fluid dynamics) Mass transfer |
| spellingShingle | Nanofluids Boundary layer (Fluid dynamics) Mass transfer Ahmad Kardri, Mahani Boundary layer flow, heat and mass transfer over a stretching or shrinking surfaces in a nanofluid |
| title | Boundary layer flow, heat and mass transfer over a stretching or shrinking surfaces in a nanofluid |
| title_full | Boundary layer flow, heat and mass transfer over a stretching or shrinking surfaces in a nanofluid |
| title_fullStr | Boundary layer flow, heat and mass transfer over a stretching or shrinking surfaces in a nanofluid |
| title_full_unstemmed | Boundary layer flow, heat and mass transfer over a stretching or shrinking surfaces in a nanofluid |
| title_short | Boundary layer flow, heat and mass transfer over a stretching or shrinking surfaces in a nanofluid |
| title_sort | boundary layer flow, heat and mass transfer over a stretching or shrinking surfaces in a nanofluid |
| topic | Nanofluids Boundary layer (Fluid dynamics) Mass transfer |
| url | http://psasir.upm.edu.my/id/eprint/118246/ http://psasir.upm.edu.my/id/eprint/118246/ http://psasir.upm.edu.my/id/eprint/118246/1/118246.pdf |