Relaxation Effect of Acoustic Plate Modes Bordered with High Viscous Fluids
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概要
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This study theoretically and experimentally investigated the relaxation of acoustic plate modes (APMs) under high viscous fluid loading. Partial wave theory was adopted to analyze acoustic waves that propagate in a piezoelectric plate and fluid, which was modeled as a Maxwellian fluid. A delay-line APM sensor consisted of input and output interdigital transducers (IDTs) with center frequency of 51 MHz was proven experimentally. By varying the ambient temperature, the insertion-loss saturation of APM, which was in contact with glycerol, was clear because of relaxation. Comparing the theoretical results with the experimental data yielded a high-frequency shear rigidity modulus of $2.5 \times 10^{8}$ N/m2, which was related to the relaxation effect of the fluid. The dependence of APM frequency on temperature was also obtained. The high linearity of the relationship revealed that the APM sensor could be used to detect the temperature of the surrounding fluid.
- 2008-08-25
著者
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Lai Chien-Hsun
Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 10617, Republic of China
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Yang Ming-Yi
Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 10617, Republic of China
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Tseng Jiun-Yi
Materials and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan 31040, Republic of China