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Metinee Phantu. Termination and wave breakup of free and pinned spiral waves under electrical forcing in excitable chemical media. Doctoral Degree(Physics). Kasetsart University. Office of the University Library. : Kasetsart University, 2018.
Termination and wave breakup of free and pinned spiral waves under electrical forcing in excitable chemical media
Name: Metinee Phantu
keyword:
Spiral waves
Classification :.LCCS: QC174.24.S65
LCSH:
Electric waves
Abstract:
In the work, we present a study on the control of spiral wave by electrical current in the Belousov-Zhabotinsky reaction. The investigation is divided into of two parts: Part I. the influence of Electrical forcing on unpinning and termination the spiral waves, II. Electrical forcing on breakup of free and pinned spiral waves. The experimental findings in both parts are reproduced by numerical simulations using the Oregonator model. In part I, an application of electrical forcing to release pinned spiral waves from obstacles and to terminate the free spiral waves at the boundary has been investigated. Increasing [H2SO4] raises the excitability of the reaction and reduces the core diameter and the period of free spiral waves. An electric current with density stronger than a critical value Junpin causes a pinned spiral wave to drift away from the obstacle. For a given obstacle size, Junpin increases with [H2SO4]. Under an applied electrical current, the rotation center of a free spiral wave drifts along a straight path to the boundary. When the current density is stronger than a critical value Jterm, the spiral tip is forced to hit the boundary, similar to Junpin, Jterm also increases with [H2SO4]. In part II, we present an investigation on the breakup of free and pinned spiral waves under an applied electrical current. The wave fronts are decelerated and the applied current stops their propagation which leads to a spiral breakup when the current density reaches a critical value Jbreak. The breakup of free and pinned spiral waves occurs at Jbreak that increases with [H2SO4] and the obstacle diameter, respectively. Analysis of spiral dynamics shows that the enhancement of the endurance against the front breakup of both free and pinned spiral waves is originated by the increment of wave speed when either the excitability is strengthened or the obstacle size is enlarged.
Kasetsart University. Office of the University Library
Address:
Bangkok
Email:
tdckulib@ku.ac.th
Name: Chaiya Luengviriya
Role:
Thesis Advisor
Created:
2018
Modified:
2025-06-29
Issued:
2025-06-29
วิทยานิพนธ์/Thesis
application/pdf
URL: https://www.lib.ku.ac.th/KUthesis/2561/metinee-pha-all.pdf
CallNumber:
QC174.24.S65 .M48
eng
DegreeName: Doctor of Philosophy
Level: Doctoral Degree
Descipline: Physics
Grantor: Kasetsart University
©copyrights Kasetsart University
RightsAccess:
ใช้เวลา
0.036489 วินาที
Metinee Phantu
| Title | Contributor | Type |
|---|---|---|
| Inhibitory effect of oxygen on excitation waves in the Belousov-Zhabotinsky reaction with different excitability
มหาวิทยาลัยเกษตรศาสตร์ Metinee Phantu | Chaiya Luengviriya | วิทยานิพนธ์/Thesis |
| Termination and wave breakup of free and pinned spiral waves under electrical forcing in excitable chemical media
มหาวิทยาลัยเกษตรศาสตร์ Metinee Phantu | Chaiya Luengviriya | วิทยานิพนธ์/Thesis |
Chaiya Luengviriya