Kajian kesan kerosakan tompokan oleh mikrojet

A hydrodynamic phenomenon that normally receives mere attention is cavitation. The presence of cavitation bubble in a system that involves fluid flowing causes a lot of trouble. Damage, erosion and noise is some of the effects of these phenomena. Although, a lot of efforts had been put forward to de...

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Main Author:	Ayof, Mohamad Nizam
Format:	Thesis
Language:	English
Published:	2001
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/6671/6/MohamadNizamAyofMFS2001.PDF
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id	my-utm-ep.6671
record_format	uketd_dc
spelling	my-utm-ep.66712020-07-27T08:39:51Z Kajian kesan kerosakan tompokan oleh mikrojet 2001-05 Ayof, Mohamad Nizam QC Physics A hydrodynamic phenomenon that normally receives mere attention is cavitation. The presence of cavitation bubble in a system that involves fluid flowing causes a lot of trouble. Damage, erosion and noise is some of the effects of these phenomena. Although, a lot of efforts had been put forward to determine the cause of damage but yet, until now, no solution had been discovered. To throw some light, this work was carried out in order to contribute one possible solution to the problem. This is performed by concentrating only one aspect of damage mechanism that is microjet. Parallel to this objective, we used a fundamental approach by using a single bubble. A Q-switched Nd:YAG laser was employed as a source of a single cavitation bubble near a solid boundary. Metallurgical and soft surface technique was conducted to analyze the damage obtained due to the accumulation of single bubble exposure. The damage mechanism was identified in conjunction with a high-speed photographic technique. The observation results were utilized to determine the impact pressure and velocity of the microjet. The maximum velocity was found as 169.5 ms-' associated with water hammer pressure of 254.250 MPa. Such impressive pressure is enough to damage even hard boundary. This is also consolidating by magnifying the result of cavitation damage. Nevertheless the whole damage pattern is in an annular form, but on top of the ring is fully comprised of individual pits. The average area and diameter are found to be 0.0052 mm2 and 0.08 15 mrn respectively. No doubt that no other mechanism poses such smaller size except microjet. The measurement and observation results confirmed that microjet is the dominant mechanism of damage. 2001-05 Thesis http://eprints.utm.my/id/eprint/6671/ http://eprints.utm.my/id/eprint/6671/6/MohamadNizamAyofMFS2001.PDF application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:62374 masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QC Physics
spellingShingle	QC Physics Ayof, Mohamad Nizam Kajian kesan kerosakan tompokan oleh mikrojet
description	A hydrodynamic phenomenon that normally receives mere attention is cavitation. The presence of cavitation bubble in a system that involves fluid flowing causes a lot of trouble. Damage, erosion and noise is some of the effects of these phenomena. Although, a lot of efforts had been put forward to determine the cause of damage but yet, until now, no solution had been discovered. To throw some light, this work was carried out in order to contribute one possible solution to the problem. This is performed by concentrating only one aspect of damage mechanism that is microjet. Parallel to this objective, we used a fundamental approach by using a single bubble. A Q-switched Nd:YAG laser was employed as a source of a single cavitation bubble near a solid boundary. Metallurgical and soft surface technique was conducted to analyze the damage obtained due to the accumulation of single bubble exposure. The damage mechanism was identified in conjunction with a high-speed photographic technique. The observation results were utilized to determine the impact pressure and velocity of the microjet. The maximum velocity was found as 169.5 ms-' associated with water hammer pressure of 254.250 MPa. Such impressive pressure is enough to damage even hard boundary. This is also consolidating by magnifying the result of cavitation damage. Nevertheless the whole damage pattern is in an annular form, but on top of the ring is fully comprised of individual pits. The average area and diameter are found to be 0.0052 mm2 and 0.08 15 mrn respectively. No doubt that no other mechanism poses such smaller size except microjet. The measurement and observation results confirmed that microjet is the dominant mechanism of damage.
format	Thesis
qualification_level	Master's degree
author	Ayof, Mohamad Nizam
author_facet	Ayof, Mohamad Nizam
author_sort	Ayof, Mohamad Nizam
title	Kajian kesan kerosakan tompokan oleh mikrojet
title_short	Kajian kesan kerosakan tompokan oleh mikrojet
title_full	Kajian kesan kerosakan tompokan oleh mikrojet
title_fullStr	Kajian kesan kerosakan tompokan oleh mikrojet
title_full_unstemmed	Kajian kesan kerosakan tompokan oleh mikrojet
title_sort	kajian kesan kerosakan tompokan oleh mikrojet
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2001
url	http://eprints.utm.my/id/eprint/6671/6/MohamadNizamAyofMFS2001.PDF
_version_	1747814684916973568

Kajian kesan kerosakan tompokan oleh mikrojet

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