T001258.pdf - ANALYTICAL AND NUMERICAL SENSITIVITY ANALYSIS...

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ANALYTICAL AND NUMERICAL SENSITIVITY ANALYSIS OF CONSTANT TEMPERATURE HOT- WIRE ANEMOMETRE A Thesis Submitted to the Graduate School of Engineering and Science of İzmir Institute of Technology in Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE in Mechanical Engineering by Yusuf Can UZ July 2014 İZMİR
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We approve the thesis of Yusuf Can UZ . Examining Committee Members: ________________________________ Assist. Prof. Dr. Ünver ÖZKOL Department of Mechanical Engineering İzmir Institute of Technology ________________________________ Assoc. Prof. Dr. Moghtada MOBEDİ Department of Mechanical Engineering İzmir Institute of Technology ________________________________ Assoc. Prof. Dr. Tahsin BAŞARAN Department of Architecture İzmir Institute of Technology 9 July 2014 ________________________________ Assist. Prof. Dr. Ünver ÖZKOL Supervisor, Department of Mechanical Engineering İzmir Institute of Technology _______________________ Prof. Dr. Metin TANOĞLU Head of the Department of Mechanical Engineering _________________________ Prof. Dr. R. Tuğrul SENGER Dean of the Graduate School of Engineering and Sciences
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ACKNOWLEDGMENTS This thesis is dedicated to my family Sait Ali and Naide UZ, who have always believed me. I would like to thank to my family for their constant encouragement and support. I would like to thank to my advisor, Dr. Ünver ÖZKOL , for his constant support throughout dissertation. His continuous guidance is greatly appreciated. I am also grateful to the other committee members for the guidance. I would like to thank to Assist. Prof. Dr. Levent AYDIN, for his endless effort to teach all his computer programming knowledge to me. I would like t o appreciate deeply my colleague Çağlar COŞKUN, Egemen AĞAKAY, Mutlu Devran YAMAN and Serkan KANGAL for their support during the investigations and report of the thesis. Finally, I would like to express my special thanks to my friends Emrah, Erdem, Mehmet , Zehra, Çisem, Gizem, Hamza, Levent, Sırma, Aysel and others for their encouragement, support and patience during this graduate work.
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iv ABSTRACT ANALYTICAL AND NUMERICAL SENSITIVITY ANALYSIS OF CONSTANT TEMPERATURE HOT-WIRE ANEMOMETRE Hot-wire anemometry (HWA) has been used for many years as a research tool in fluid mechanics. HWA consists of a wire sensor, a very fine element exposed to the fluid flow and of an electronic system, which performs the transformation of the sensor output into a useful electric signal. HWA is based on convective heat transfer from a heated wire which is placed into a fluid flow. The heat is generated inside the very fine wire owing to wire resistance when electrical current passes through it. Then, the wire will be subjected to heat losses by convection, conduction and radiation depending on the flow condition. To examine the theory of operation for the heated wire and plot the temperature distribution along it, energy balance for HWA is investigated by taking differential element of length of the filament. In order to understand static and dynamic characteristics of hot-wire, all kinds of heat transfer such as convection, conduction and radiation are taken into consideration. In present thesis, the static study
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