Computational study of blood flow through vortex generator integrated mechanical heart valve

Treatments for heart valve illness are being replaced by two types of prosthetics: bio-prosthetic heart valves (BHV) constructed from tissue material and mechanical heart valves (MHV) made of pyrolytic carbon. However, the replacement of the heart valve has several issues such as hemolysis, tissue o...

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Main Author:	Mohd Salleh, Nursyaira
Format:	Thesis
Language:	English English
Published:	2023
Subjects:	R Medicine (General) RD Surgery
Online Access:	http://eprints.utem.edu.my/id/eprint/28257/1/Computational%20study%20of%20blood%20flow%20through%20vortex%20generator%20integrated%20mechanical%20heart%20valve.pdf http://eprints.utem.edu.my/id/eprint/28257/2/Computational%20study%20of%20blood%20flow%20through%20vortex%20generator%20integrated%20mechanical%20heart%20valve.pdf
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spelling	my-utem-ep.282572024-12-13T09:40:20Z Computational study of blood flow through vortex generator integrated mechanical heart valve 2023 Mohd Salleh, Nursyaira R Medicine (General) RD Surgery Treatments for heart valve illness are being replaced by two types of prosthetics: bio-prosthetic heart valves (BHV) constructed from tissue material and mechanical heart valves (MHV) made of pyrolytic carbon. However, the replacement of the heart valve has several issues such as hemolysis, tissue overgrowth and thrombosis which still need improvement of the overall process. For MHV, the major complication is blood clotting, known as thrombosis and bleeding. MHV malfunction which lead to sudden death or stroke. The computational analysis was developed to study the blood flow through MHV equipped with VG. Thrombosis complications identified through non-physiological flow patterns such as pressure drop, recirculation, and wall shear stress (WSS). The result is validated with previous literature with percentage error of maximum velocity at central jet with 1.4% error. Results found that 1 mm triangular VG produced an optimum result with 25.13 % reduction of pressure drop compared to the absence of VG in laminar flow on idealized asymmetric aorta. Furthermore, three turbulence models, namely, Spalart Allmaras (SA), k-epsilon (k-ε), and Large Eddy Simulation (LES), were used to analyze the blood clotting potential in MHV with and without VGs under turbulence effect. The results found the LES turbulent model most suitable to capture unsteady solutions with rich coherent vortex shedding and providing 33.4 % lower WSS compared to the MHV without VGs. This method was also used for the anatomic aorta model with the same solver and including the VGs. The implication of VGs on the leaflet of SJM valve produced lower 15.33 % WSS and small recirculation zones by 7 % associated with lower platelet to be trapped inside anatomic aorta compared to the absence of VGs. 2023 Thesis http://eprints.utem.edu.my/id/eprint/28257/ http://eprints.utem.edu.my/id/eprint/28257/1/Computational%20study%20of%20blood%20flow%20through%20vortex%20generator%20integrated%20mechanical%20heart%20valve.pdf text en public http://eprints.utem.edu.my/id/eprint/28257/2/Computational%20study%20of%20blood%20flow%20through%20vortex%20generator%20integrated%20mechanical%20heart%20valve.pdf text en validuser https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=123830 mphil masters Universiti Teknikal Malaysia Melaka Faculty of Mechanical Engineering Zakaria, Mohamad Shukri
institution	Universiti Teknikal Malaysia Melaka
collection	UTeM Repository
language	English English
advisor	Zakaria, Mohamad Shukri
topic	R Medicine (General) RD Surgery
spellingShingle	R Medicine (General) RD Surgery Mohd Salleh, Nursyaira Computational study of blood flow through vortex generator integrated mechanical heart valve
description	Treatments for heart valve illness are being replaced by two types of prosthetics: bio-prosthetic heart valves (BHV) constructed from tissue material and mechanical heart valves (MHV) made of pyrolytic carbon. However, the replacement of the heart valve has several issues such as hemolysis, tissue overgrowth and thrombosis which still need improvement of the overall process. For MHV, the major complication is blood clotting, known as thrombosis and bleeding. MHV malfunction which lead to sudden death or stroke. The computational analysis was developed to study the blood flow through MHV equipped with VG. Thrombosis complications identified through non-physiological flow patterns such as pressure drop, recirculation, and wall shear stress (WSS). The result is validated with previous literature with percentage error of maximum velocity at central jet with 1.4% error. Results found that 1 mm triangular VG produced an optimum result with 25.13 % reduction of pressure drop compared to the absence of VG in laminar flow on idealized asymmetric aorta. Furthermore, three turbulence models, namely, Spalart Allmaras (SA), k-epsilon (k-ε), and Large Eddy Simulation (LES), were used to analyze the blood clotting potential in MHV with and without VGs under turbulence effect. The results found the LES turbulent model most suitable to capture unsteady solutions with rich coherent vortex shedding and providing 33.4 % lower WSS compared to the MHV without VGs. This method was also used for the anatomic aorta model with the same solver and including the VGs. The implication of VGs on the leaflet of SJM valve produced lower 15.33 % WSS and small recirculation zones by 7 % associated with lower platelet to be trapped inside anatomic aorta compared to the absence of VGs.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Mohd Salleh, Nursyaira
author_facet	Mohd Salleh, Nursyaira
author_sort	Mohd Salleh, Nursyaira
title	Computational study of blood flow through vortex generator integrated mechanical heart valve
title_short	Computational study of blood flow through vortex generator integrated mechanical heart valve
title_full	Computational study of blood flow through vortex generator integrated mechanical heart valve
title_fullStr	Computational study of blood flow through vortex generator integrated mechanical heart valve
title_full_unstemmed	Computational study of blood flow through vortex generator integrated mechanical heart valve
title_sort	computational study of blood flow through vortex generator integrated mechanical heart valve
granting_institution	Universiti Teknikal Malaysia Melaka
granting_department	Faculty of Mechanical Engineering
publishDate	2023
url	http://eprints.utem.edu.my/id/eprint/28257/1/Computational%20study%20of%20blood%20flow%20through%20vortex%20generator%20integrated%20mechanical%20heart%20valve.pdf http://eprints.utem.edu.my/id/eprint/28257/2/Computational%20study%20of%20blood%20flow%20through%20vortex%20generator%20integrated%20mechanical%20heart%20valve.pdf
_version_	1818612058007011328

Computational study of blood flow through vortex generator integrated mechanical heart valve

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