Publication

3D FEM dissipation model of suspended micro channel resonators

2016
Talks

Abstract

Suspended micro channel resonators (SMCs) consist of hollow resonant structures containing an embedded u-shaped micro fluidic channel. The confinement of the fluid inside the resonator allows real time detection of liquid compounds in air or in vacuum, while the device quality factor remains almost unaffected. Quality factor of conventional cantilevers immersed in fluid monotonically decreases as the fluid viscosity increases. On the other hand SMCs exhibit a non-monotonic energy dissipation as the fluid viscosity is increased or decreased. In this work we present a fully three dimensional modal analysis of the fluid structure interaction (FSI) problem to predict the quality factor dependence on fluid properties. The reliability of our model is demonstrated through literature comparison of analytical model and experimental results.

Official source

https://infoscience.epfl.ch/entities/publication/6f8c5f80-7b61-4859-95fb-b0bcf6803dff

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2016
Talks

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6f8c5f80-7b61-4859-95fb-b0bcf6803dff

About this result

Related concepts (32)

Fluid mechanics

Fluid mechanics is the branch of physics concerned with the mechanics of fluids (liquids, gases, and plasmas) and the forces on them. It has applications in a wide range of disciplines, including mechanical, aerospace, civil, chemical, and biomedical engineering, as well as geophysics, oceanography, meteorology, astrophysics, and biology. It can be divided into fluid statics, the study of fluids at rest; and fluid dynamics, the study of the effect of forces on fluid motion.

Viscosity

The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. Viscosity is defined scientifically as a force multiplied by a time divided by an area. Thus its SI units are newton-seconds per square metre, or pascal-seconds. Viscosity quantifies the internal frictional force between adjacent layers of fluid that are in relative motion.

Newtonian fluid

A Newtonian fluid is a fluid in which the viscous stresses arising from its flow are at every point linearly correlated to the local strain rate — the rate of change of its deformation over time. Stresses are proportional to the rate of change of the fluid's velocity vector. A fluid is Newtonian only if the tensors that describe the viscous stress and the strain rate are related by a constant viscosity tensor that does not depend on the stress state and velocity of the flow.

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3D FEM dissipation model of suspended micro channel resonators

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