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Title: Velocity profiles and turbulence in the aorta : a study by hot-film anemometry
Author: Seed, William Anthony
ISNI:       0000 0004 2743 0756
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 1973
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This thesis describes experimental observations on the form of velocity profiles and the incidence and nature of flow disturbances and turbulence in the aorta. The work is presented in two parts. In the first, the technique of constant temperature hot-film anemometry, and its possible application to measurement of point blood velocity in arteries, is discussed. The development and evaluation of a probe designed for intra-arterial use is described, and the performance of the probe and anemometer system in steady, unsteady and turbulent flows of water and blood are evaluated. The system is shown to be capable of registering arterial point velocities with acceptable limitations of accuracy and frequency response. The second part describes measurements made with this system in the aorta of dogs. Velocity profiles in the thoracic and abdominal aorta are shown to be blunt, with boundary-layers estimated to be less than 2 mm. thick throughout the cycle; significant skews are demonstrated, the explanation for which appears to lie in the influence of local geometry on the flow. A study of flow disturbances in the aorta, based on visual observation of instantaneous velocity waveforms and frequency spectral analysis, is also reported.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available