Marangoni convection in a horizontal liquid layer with insoluble surfactant / Ainon Syazana Ab Hamid

Thermocapillary (Marangoni) convection either steady or oscillatory is known to cause imperfection in the quality of products. The dynamics of the convective motion in a thin fluid layer and the gradients of the surface tension can be significantly altered by the presence of insoluble surfactant, in...

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Main Author:	Ab Hamid, Ainon Syazana
Format:	Thesis
Language:	English
Published:	2013
Subjects:	Physical and theoretical chemistry
Online Access:	https://ir.uitm.edu.my/id/eprint/16253/2/16253.pdf
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id	my-uitm-ir.16253
record_format	uketd_dc
spelling	my-uitm-ir.162532024-05-30T02:54:06Z Marangoni convection in a horizontal liquid layer with insoluble surfactant / Ainon Syazana Ab Hamid 2013 Ab Hamid, Ainon Syazana Physical and theoretical chemistry Thermocapillary (Marangoni) convection either steady or oscillatory is known to cause imperfection in the quality of products. The dynamics of the convective motion in a thin fluid layer and the gradients of the surface tension can be significantly altered by the presence of insoluble surfactant, internal heat generation and the application of a feedback thermal controller. In this study, linearly dependent surface tension gradient on temperature and surfactant concentration with the effects of thermal feedback control and internal heat generation are considered to examine the instability of the steady Marangoni convection. The objectives of this study are to analyze theoretically the effect of heat generation and feedback control on Marangoni convection in a horizontal liquid layer with insoluble surfactant. The layer is bounded from below by a rigid heat-conducting plate and above by a free surface. The linear stability theory of the system is performed to undertake a detail investigation. The critical Marangoni numbers for condition of uniform heat flux revealed lower values' in contrast to uniform temperature condition. The system with uniform temperature condition is more stable than the condition of uniform heat flux. Small controller gains are able to stabilize the system but large controller gain becomes a destabilizing factor. Internal heat source destabilizes the system and insoluble surfactant of low concentration has a stabilizing effect. The ability to control by either delaying or advancing the onset of instability can lead to better material processes and achieve optimum outcomes. 2013 Thesis https://ir.uitm.edu.my/id/eprint/16253/ https://ir.uitm.edu.my/id/eprint/16253/2/16253.pdf text en public mphil masters Universiti Teknologi Mara Faculty of Computer and Mathematical Sciences
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Physical and theoretical chemistry
spellingShingle	Physical and theoretical chemistry Ab Hamid, Ainon Syazana Marangoni convection in a horizontal liquid layer with insoluble surfactant / Ainon Syazana Ab Hamid
description	Thermocapillary (Marangoni) convection either steady or oscillatory is known to cause imperfection in the quality of products. The dynamics of the convective motion in a thin fluid layer and the gradients of the surface tension can be significantly altered by the presence of insoluble surfactant, internal heat generation and the application of a feedback thermal controller. In this study, linearly dependent surface tension gradient on temperature and surfactant concentration with the effects of thermal feedback control and internal heat generation are considered to examine the instability of the steady Marangoni convection. The objectives of this study are to analyze theoretically the effect of heat generation and feedback control on Marangoni convection in a horizontal liquid layer with insoluble surfactant. The layer is bounded from below by a rigid heat-conducting plate and above by a free surface. The linear stability theory of the system is performed to undertake a detail investigation. The critical Marangoni numbers for condition of uniform heat flux revealed lower values' in contrast to uniform temperature condition. The system with uniform temperature condition is more stable than the condition of uniform heat flux. Small controller gains are able to stabilize the system but large controller gain becomes a destabilizing factor. Internal heat source destabilizes the system and insoluble surfactant of low concentration has a stabilizing effect. The ability to control by either delaying or advancing the onset of instability can lead to better material processes and achieve optimum outcomes.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Ab Hamid, Ainon Syazana
author_facet	Ab Hamid, Ainon Syazana
author_sort	Ab Hamid, Ainon Syazana
title	Marangoni convection in a horizontal liquid layer with insoluble surfactant / Ainon Syazana Ab Hamid
title_short	Marangoni convection in a horizontal liquid layer with insoluble surfactant / Ainon Syazana Ab Hamid
title_full	Marangoni convection in a horizontal liquid layer with insoluble surfactant / Ainon Syazana Ab Hamid
title_fullStr	Marangoni convection in a horizontal liquid layer with insoluble surfactant / Ainon Syazana Ab Hamid
title_full_unstemmed	Marangoni convection in a horizontal liquid layer with insoluble surfactant / Ainon Syazana Ab Hamid
title_sort	marangoni convection in a horizontal liquid layer with insoluble surfactant / ainon syazana ab hamid
granting_institution	Universiti Teknologi Mara
granting_department	Faculty of Computer and Mathematical Sciences
publishDate	2013
url	https://ir.uitm.edu.my/id/eprint/16253/2/16253.pdf
_version_	1804889560111382528

Marangoni convection in a horizontal liquid layer with insoluble surfactant / Ainon Syazana Ab Hamid

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