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Dynamics of the Bell Prover, II
Fillmer W Ruegg1, Fillmer C Ruegg1
1National Institute of Standards and Technology, Gaithersburg, MD 20899.
Summary
This study simulates bell prover performance for gas flowrate measurements, revealing motion fluctuations. Modifications to the prover design can significantly improve measurement accuracy by dampening these fluctuations.
Area of Science:
- Mechanical Engineering
- Fluid Dynamics
- Metrology
Background:
- The bell prover is a standard instrument for gas flowrate measurement.
- It operates by timing a bell's rise through a sealing liquid.
- Assumptions of constant bell speed may not hold true, affecting accuracy.
Purpose of the Study:
- To simulate bell prover performance using a differential equation for bell motion.
- To analyze the impact of gas and sealing liquid dynamics on prover accuracy.
- To propose and evaluate modifications for enhanced measurement precision.
Main Methods:
- Utilized a previously derived differential equation for bell motion.
- Modified equations of motion for gas and sealing liquid.
- Developed a computer simulation to model prover performance.
Main Results:
- Simulations revealed substantial fluctuations in bell, gas, and liquid motions.
- Identified that existing measurement procedures may be affected by these fluctuations.
- Demonstrated that proposed prover modifications can dampen fluctuations.
Conclusions:
- Bell prover operation is subject to dynamic fluctuations impacting measurement accuracy.
- Computer simulations provide a basis for understanding and improving prover performance.
- Specific modifications to the bell prover design can mitigate fluctuations and enhance accuracy.
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