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Design and Evaluation of Ultrasonic Flow Meter for High Temperature by Using Finite Element Method

유한요소법을 이용한 고온용 초음파 유량센서의 설계 및 평가

  • Lee, Joo-Hee (Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Chang-Il (Korea Institute of Ceramic Engineering and Technology) ;
  • Paik, Jong-Hoo (Korea Institute of Ceramic Engineering and Technology) ;
  • Cho, Jeong-Ho (Korea Institute of Ceramic Engineering and Technology) ;
  • Jeong, Young-Hun (Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Young-Jin (Korea Institute of Ceramic Engineering and Technology) ;
  • Nahm, Sahn (Department of Materials Science and Engineering, Korea University)
  • Received : 2011.09.28
  • Accepted : 2011.10.18
  • Published : 2011.11.01

Abstract

An operation temperature of $Pb(Zr,Ti)O_3$ based piezoelectric ultrasonic flowmeter was generally restricted to below 200$^{\circ}C$ due to a low depoling temperature of its ceramic material. Thus, a new designed piezoelectric ultrasonic flowmeter was fabricated in order to protect from the extremely hot fluid. Its structure is optimized by a finite element method to effectively stop heat flowing along a waveguide. Various materials such as Cu, Al, SUS were examined as a multi-plate radiation shield to enhance the performance of piezoelectric ultrasonic flowmeter. The SUS was evaluated as the most effective material to enhance the performance of piezoelectric ultrasonic flowmeter. As the number of plates of the radiation shield increased, the temperature at piezoelectric transducer away from the hot fluid was constantly decreased with a ratio of 3.12$^{\circ}C$ per the plate number.

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