Abstract
Coriolis mass flowmeters are highly customized products involving high-degree fluid-structure coupling dynamics and high-precision manufacture. The typical delay from from order to shipment is at least 4 months. This paper presents some important design considerations through simulation and experiments, so as to provide manufacturers with a more time-efficient product design and manufacture process. This paper aims at simulating the fluid-structure coupling dynamics of a dual U-tube Coriolis mass flowmeter through the COMSOL simulation package. The simulation results are experimentally validated using a dual U-tube CMF manufactured by Yokogawa Co., Ltd. in a TAF certified flow testing factory provided by FineTek Co., Ltd. Some important design considerations are drawn from simulation and experiment. The zero drift will occur when the dual U-tube structure is unbalanced and therefore the dynamic balance is very important in the manufacturing of dual U-tube CMF. The fluid viscosity can be determined from the driving current of the voice coil actuator or the pressure loss between the inlet and outlet of CMF. Finally, the authors develop a simulation application based on COMSOL’s development platform. Users can quickly evaluate their design through by using this application. The present application can significantly shorten product design and manufacturing time.
Highlights
A Coriolis mass flow meter (CMF) facilitates the direct measurement of mass flow rates
The simulation agrees very well with the experiment though there is a regular deviation of about only 3% between the resonant frequency of experiment and simulation for different fluid density. This regular deviation maybe comes from the frequency-dependent dynamic water stiffness and damping and the mass density of the solid-air-water mixture [16]
This finite element modeling can effectively simulate the resonance frequency of CMF when filled with static fluid
Summary
A Coriolis mass flow meter (CMF) facilitates the direct measurement of mass flow rates. A CMF’s measurement accuracy is high because it is less affected by factors such as the medium’s density, pressure and temperature. CMFs of varied structural designs can be used for different fluid media, such as high-viscosity and non-Newtonian fluids as well as liquids containing trace gases, under certain conditions. CMFs can be used to measure volume flow rate, density, temperature, viscosity, and concentration. U-tube CMF: Roughly describes the structure and boundary conditions of the simulated CMF with images. Operation of the dual U-tube CMF: Aids the user in roughly understanding CMF operation when fluid is flowing or not flowing.
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