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Vibro-acoustic radiation from a fluid-filled viscoelastic cylindrical shell with internal turbulent flow

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  1. Tez No: 401056
  2. Yazar: YİĞİT YAZICIOĞLU
  3. Danışmanlar: PROF. THOMAS J. ROYSTON
  4. Tez Türü: Doktora
  5. Konular: Makine Mühendisliği, Mechanical Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2005
  8. Dil: İngilizce
  9. Üniversite: Unıversıty Of Illınoıs At Chıcago
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: Belirtilmemiş.

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Özet (Çeviri)

The effects of flow disturbances in a subsurface fluid channel with compliant walls on the surface vibrations of a surrounding fluid or viscoelastic medium are investigated through theoretical and numerical calculations and experimental studies. This study could lead to a better understanding of how measurements on the surface of the skin can be used to assess blood flow patency in subsurface vessels. This could aid in detecting vascular diseases and also help in understanding mechanisms of vascular pathology. The pressure field downstream of a constricted flow was predicted by developing an empirical model for an axisymmetric flow field using experimental results found in the literature. There was good agreement between the theoretical pressure predictions and experimental pressure measurements carried out in this study. The effect of an internal pressure source resulting from a stenotic flow disturbance on the compliant, cylindrical vessel structure was investigated by using a fluid-filled cylindrical shell theory that is widely available in literature that had been developed for infinite length tubes. This formulation was modified and simplified for finite length tubes and applied to this problem. Theoretical calculations and experimental measurements compare well. Changes in flow conditions such as the flow rate, presence or absence of a geometric disturbance, and mean pressure, had significant effects on the radial displacement response of the compliant flexible tube. The problem was further investigated by looking at the surface response of a viscoelastic medium that includes the embedded cylindrical structure carrying the disturbed flow. Elastodynamic solutions of basic acoustic sources in viscoelastic medium were utilized in finding the surface response of the tissue mimicking material when excited by a buried cylindrical structure. Surface response was correlated with the excitation due to flow taking place under the surface inside the cylindrical structure resembling a typical blood vessel. With the use of correct sensor technology there is a potential application of these findings in the medical field in the detection and prevention of vascular diseases.

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