Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.661330
Title: Application of particle image velocimetry to the measurement of non-linear effects generated by high-intensity acoustic fields
Author: Rockliff, Dawn
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2002
Availability of Full Text:
Access through EThOS:
Full text unavailable from EThOS. Please try the link below.
Access through Institution:
Abstract:
Non-linear effects are known to occur in high intensity sound fields and have important consequences in the study of a diverse range of applications from medical imaging to musical instruments. Particle Image Velocimetry (PIV) is used to obtain full-field instantaneous velocity information without physical intrusion into the acoustic field. After a review of the theory of PIV, the technique is applied to the investigation of non-linear effects on acoustic streaming in a closed-end cylindrical tube. A distortion of the streaming motion is observed with increasing sound intensity and a comparison to theoretical work is presented. PIV is then used in conjunction with pressure measurements to examine the non-linear behaviour at the termination of a open-ended cylindrical tube. The results are compared to acoustic measurements of the non-linear radiation impedance using conventional techniques. The work is then extended through the introduction of side holes into the open tube. PIV measurements of the streaming motion as a function of frequency and intensity are made and used to draw comparisons with the streaming behaviour present at the toneholes of a modern Boehm flute under normal playing conditions. The results from this work clearly show that PIV has the potential to provide a better understanding of acoustical fields in situations where non-linear effects can have a significant influence, such as that found on musical instruments.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.661330  DOI: Not available
Share: