STUDIES OF PENDULUM-TYPE VISCOELASTIC SPECTROSCOPY FOR FLUIDS

  • 高 平

Student thesis: Master's Thesis

Abstract

This research is to develop an experimental method to determine the complex viscosity and complex shear modulus of liquid in the context of linear viscoelasticity Under dynamic pure bending or torsion the resonant frequency of the resonator/core can be accurately measured with or without the surrounding liquid The differences in measure loss tangent and resonant frequency can be used to determine the liquid's linear viscoelastic properties with a Maxwell-like model From the regression analysis of the experimental data based on silicone oil whose viscosity is known it is found that when viscosity is less than 50 cP the regression equations are determined from experimental data for the 66%- and 100%-immersed resonator case respectively For viscosity is greater than 50 cP a different set of regression equations are determined Methodology for determining the real part and imaginary part of complex shear modulus is also developed Based on the regression equations the measured viscosity of olive oil and motor oil are within 30% error percentage with respect to its labeled values In this research Portland cement lotion and egg white were also tested and data are reported in this thesis It is found that if the liquids contain colloidal particles or undergo chemical reactions such as polymerization the regression equations identified in this research may not be suitable
Date of Award2016 Aug 30
Original languageEnglish
SupervisorYun-Che Wang (Supervisor)

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