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UW Microtecnology Lab SEMINAR SERIES

UW Microtecnology Lab SEMINAR SERIES. TITLE: Analysis of the macro optical viscometer SPEARKER: Ivo Stachiv , Visiting Research Scientist Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan DATE: June 11, 3:00PM PLACE: ME 134

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UW Microtecnology Lab SEMINAR SERIES

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  1. UW Microtecnology Lab SEMINAR SERIES TITLE: Analysis of the macro optical viscometer SPEARKER: Ivo Stachiv , Visiting Research Scientist Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan DATE: June 11, 3:00PM PLACE: ME 134 ABSTRACT: The monitoring of fluid viscosity is a common analysis requirement in the process industry. Timely, accurate, and cost effective monitoring is often hindered by limits in viscosity sensors technology. Most commonly used viscosity sensors have changed little since their development in 40’s and 50’s (i.e. capillary viscometer, rotational viscometer). These viscometers, mostly mechanical devices, are often large and cumbersome to use. They are frequently confined to narrow viscosity ranges and specific fluid requirements. However, fiftenn years ago, Dr. Wang and Dr. Reinhall of University of Washington has developed a new design using a vibrating optical fiber that exisbits high sensitivity, wide range viscosity measuremnt. One would expect that vibrating fiber would behave similarly with harmonic oscillator. And also experimental data along with the model of harmonic oscillator revealed that the fluid viscosity might be deduced from a comparison between the measured vibration amplitude and the damping. Nevertheless, the frequency response and resonances of a forced fully and partially –immersed fiber in liquid vibration differ essentially from the simple harmonic models both in quantitative and qualitative sense. The absence of theoretical background makes difficult interpreting and processing of experimental data and an accurate viscosity determination. In this presentation, a mathematical model developed by Dr. Fedochenko that captures the basic and most important physics of the vibrating fiber immersed fully or partially in liquid will be presented along with the numerical method for the fully and partially immersed fiber. Obtained results compared with the previous experimental data will be shown in the end of presentation. MTL

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