Unsteady micropolar boundary layer flow and convective heat transfer

Most industrial fluids such as polymers, liquid crystals and colloids contain suspensions of rigid particles that undergo rotation. However, the classical Navier- Stokes theory normally associated with Newtonian fluids is inadequate to describe such fluids as it does not take into account the effect...

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Main Author:	Ali, Anati
Format:	Thesis
Language:	English
Published:	2009
Subjects:	QA Mathematics
Online Access:	http://eprints.utm.my/id/eprint/13667/1/AnatiAliPFSA2009.pdf
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spelling	my-utm-ep.136672018-06-04T09:54:13Z Unsteady micropolar boundary layer flow and convective heat transfer 2009-07 Ali, Anati QA Mathematics Most industrial fluids such as polymers, liquid crystals and colloids contain suspensions of rigid particles that undergo rotation. However, the classical Navier- Stokes theory normally associated with Newtonian fluids is inadequate to describe such fluids as it does not take into account the effects of these microstructures. In this research, the unsteady boundary layer forced and mixed convection of micropolar fluids are considered where the unsteadiness is due to an impulsive motion of the free stream. Both small and large time solutions as well as the occurrence of flow separation, followed by flow reversal are taken into account. The two-dimensional flow along the entire surface of a cylinder and a sphere is solved numerically using the Keller’s box scheme in a three dimensional grid where the discretization is made either on a net cube, or a zig-zag grid in the case of flow reversal. The numerical results show that as the micropolar material parameter increases, the thickness of both velocity and microrotation boundary layers, as well as the peak value of the skin friction coefficient along the body surface, also increase. Meanwhile, the value of the Nusselt number, in the case of micropolar fluids, is lower near the forward stagnation point and higher near the rear stagnation point compared to Newtonian fluids. It is also found that the separation time is brought forward in both cases of weak and strong concentration of microelements in the assisting mixed convective flows. However, in the opposing case, the separation time is delayed for a flow past a cylinder, while for a flow past a sphere, only the weak concentration of microelements can give similar results. 2009-07 Thesis http://eprints.utm.my/id/eprint/13667/ http://eprints.utm.my/id/eprint/13667/1/AnatiAliPFSA2009.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QA Mathematics
spellingShingle	QA Mathematics Ali, Anati Unsteady micropolar boundary layer flow and convective heat transfer
description	Most industrial fluids such as polymers, liquid crystals and colloids contain suspensions of rigid particles that undergo rotation. However, the classical Navier- Stokes theory normally associated with Newtonian fluids is inadequate to describe such fluids as it does not take into account the effects of these microstructures. In this research, the unsteady boundary layer forced and mixed convection of micropolar fluids are considered where the unsteadiness is due to an impulsive motion of the free stream. Both small and large time solutions as well as the occurrence of flow separation, followed by flow reversal are taken into account. The two-dimensional flow along the entire surface of a cylinder and a sphere is solved numerically using the Keller’s box scheme in a three dimensional grid where the discretization is made either on a net cube, or a zig-zag grid in the case of flow reversal. The numerical results show that as the micropolar material parameter increases, the thickness of both velocity and microrotation boundary layers, as well as the peak value of the skin friction coefficient along the body surface, also increase. Meanwhile, the value of the Nusselt number, in the case of micropolar fluids, is lower near the forward stagnation point and higher near the rear stagnation point compared to Newtonian fluids. It is also found that the separation time is brought forward in both cases of weak and strong concentration of microelements in the assisting mixed convective flows. However, in the opposing case, the separation time is delayed for a flow past a cylinder, while for a flow past a sphere, only the weak concentration of microelements can give similar results.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ali, Anati
author_facet	Ali, Anati
author_sort	Ali, Anati
title	Unsteady micropolar boundary layer flow and convective heat transfer
title_short	Unsteady micropolar boundary layer flow and convective heat transfer
title_full	Unsteady micropolar boundary layer flow and convective heat transfer
title_fullStr	Unsteady micropolar boundary layer flow and convective heat transfer
title_full_unstemmed	Unsteady micropolar boundary layer flow and convective heat transfer
title_sort	unsteady micropolar boundary layer flow and convective heat transfer
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2009
url	http://eprints.utm.my/id/eprint/13667/1/AnatiAliPFSA2009.pdf
_version_	1747814983413006336

Unsteady micropolar boundary layer flow and convective heat transfer

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