Thermosolutal marangoni convective boundary layer equations / Noraini Ahmad

Prandtl velocity boundary layer has conceptualized the mathematical description of boundary layers that led to wide applications in engineering processes. In coupled dissipative boundary layer, the surface tension gradient play an important role at the interface in determining the characteristics of...

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Main Author:	Ahmad, Noraini
Format:	Thesis
Language:	English
Published:	2013
Online Access:	http://ir.uitm.edu.my/id/eprint/16382/ http://ir.uitm.edu.my/id/eprint/16382/1/TP_NORAINI%20AHMAD%20BASRI%20APB%2017_5.pdf

id	uitm-16382
recordtype	eprints
spelling	uitm-163822018-10-29T02:03:33Z http://ir.uitm.edu.my/id/eprint/16382/ Thermosolutal marangoni convective boundary layer equations / Noraini Ahmad Ahmad, Noraini Prandtl velocity boundary layer has conceptualized the mathematical description of boundary layers that led to wide applications in engineering processes. In coupled dissipative boundary layer, the surface tension gradient play an important role at the interface in determining the characteristics of the boundary layer flow. In this study, the surface tension is assumed to depend linearly or quadratically on temperature and/or concentration gradients. Four mathematical models are formulated for the steady dissipative boundary layer flows. The systems of the steady boundary layer equations in form of system of partial differential equations (PDE) are transformed to system of ordinary differential equations (ODE) by similarity transformation. The ODE systems are solved numerically by using the Runge-Kutta-Fehlberg with shooting technique. The first problem considered the linear dependence of surface tension on temperature and solute concentration on the momentum and heat and mass transfer of MHD mixed convection boundary layers with suction or injection. The results show that as thermal and solutal Marangoni parameters increase the velocity, thermal and concentration boundary layer thickness for buoyancy-opposed flow increases but their thickness reduce for buoyancyassisted flow. In the second problem, the combined effects of power law temperature and solute concentration on the surface tension, species concentration and pressure gradient are considered. The results shows thermosolutal surface tension ratio increases the velocity boundary layer thickness but decrease the temperature and concentration boundary layer thickness. The effect of porosity is considered in the third problem and significant effect of porosity can be observed in the momentum boundary layer but less impact on the rate of heat and mass transfer. In the fourth problem, the flow and temperature patterns on thermal Marangoni convection are studied. The effect of magnetic field, porous medium and permeable surface with the quadratic temperature dependence surface tension are considered. The results show the increase of thermocapillary or Marangoni effects and weaker magnetic field strength lead to stronger reverse flow. 2013 Thesis NonPeerReviewed text en http://ir.uitm.edu.my/id/eprint/16382/1/TP_NORAINI%20AHMAD%20BASRI%20APB%2017_5.pdf Ahmad, Noraini (2013) Thermosolutal marangoni convective boundary layer equations / Noraini Ahmad. Masters thesis, Universiti Teknologi MARA.
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Teknologi MARA
building	UiTM Institutional Repository
collection	Online Access
language	English
description	Prandtl velocity boundary layer has conceptualized the mathematical description of boundary layers that led to wide applications in engineering processes. In coupled dissipative boundary layer, the surface tension gradient play an important role at the interface in determining the characteristics of the boundary layer flow. In this study, the surface tension is assumed to depend linearly or quadratically on temperature and/or concentration gradients. Four mathematical models are formulated for the steady dissipative boundary layer flows. The systems of the steady boundary layer equations in form of system of partial differential equations (PDE) are transformed to system of ordinary differential equations (ODE) by similarity transformation. The ODE systems are solved numerically by using the Runge-Kutta-Fehlberg with shooting technique. The first problem considered the linear dependence of surface tension on temperature and solute concentration on the momentum and heat and mass transfer of MHD mixed convection boundary layers with suction or injection. The results show that as thermal and solutal Marangoni parameters increase the velocity, thermal and concentration boundary layer thickness for buoyancy-opposed flow increases but their thickness reduce for buoyancyassisted flow. In the second problem, the combined effects of power law temperature and solute concentration on the surface tension, species concentration and pressure gradient are considered. The results shows thermosolutal surface tension ratio increases the velocity boundary layer thickness but decrease the temperature and concentration boundary layer thickness. The effect of porosity is considered in the third problem and significant effect of porosity can be observed in the momentum boundary layer but less impact on the rate of heat and mass transfer. In the fourth problem, the flow and temperature patterns on thermal Marangoni convection are studied. The effect of magnetic field, porous medium and permeable surface with the quadratic temperature dependence surface tension are considered. The results show the increase of thermocapillary or Marangoni effects and weaker magnetic field strength lead to stronger reverse flow.
format	Thesis
author	Ahmad, Noraini
spellingShingle	Ahmad, Noraini Thermosolutal marangoni convective boundary layer equations / Noraini Ahmad
author_facet	Ahmad, Noraini
author_sort	Ahmad, Noraini
title	Thermosolutal marangoni convective boundary layer equations / Noraini Ahmad
title_short	Thermosolutal marangoni convective boundary layer equations / Noraini Ahmad
title_full	Thermosolutal marangoni convective boundary layer equations / Noraini Ahmad
title_fullStr	Thermosolutal marangoni convective boundary layer equations / Noraini Ahmad
title_full_unstemmed	Thermosolutal marangoni convective boundary layer equations / Noraini Ahmad
title_sort	thermosolutal marangoni convective boundary layer equations / noraini ahmad
publishDate	2013
url	http://ir.uitm.edu.my/id/eprint/16382/ http://ir.uitm.edu.my/id/eprint/16382/1/TP_NORAINI%20AHMAD%20BASRI%20APB%2017_5.pdf
first_indexed	2023-09-18T22:55:56Z
last_indexed	2023-09-18T22:55:56Z
_version_	1777417854084186112

Thermosolutal marangoni convective boundary layer equations / Noraini Ahmad

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