A5079256199- Flow Measurement and Analysis
- Advanced Sensor Technologies Research
- Scientific Measurement and Uncertainty Evaluation
- Sensor Technology and Measurement Systems
- Water Systems and Optimization
- Hydraulic and Pneumatic Systems
- Fluid Dynamics and Vibration Analysis
- Fluid Dynamics and Mixing
- Fluid Dynamics and Turbulent Flows
- Vibration and Dynamic Analysis
- Chemical Thermodynamics and Molecular Structure
- Electrical and Bioimpedance Tomography
- Advanced Thermodynamic Systems and Engines
- Intravenous Infusion Technology and Safety
- Gas Dynamics and Kinetic Theory
- Hydraulic flow and structures
- Wind and Air Flow Studies
- Refrigeration and Air Conditioning Technologies
- Advanced MEMS and NEMS Technologies
- Mechanical and Thermal Properties Analysis
- Advanced Measurement and Detection Methods
- Combustion and Detonation Processes
- Maritime Transport Emissions and Efficiency
- Aerodynamics and Acoustics in Jet Flows
- Industrial Vision Systems and Defect Detection
University of Ljubljana
2015-2024
The extremely rapid reflection of a shock wave from the end wall generated in tube, addition to high-frequency content pressure, inevitably also excites mechanical vibrations. These can potentially produce acceleration-induced spurious signals as part dynamic output pressure measurement system being calibrated. This paper proposes and evaluates method for correcting frequency response obtained with calibration using tube errors due proposed is based on predetermined accelerations...
In conventional shock tubes with a diaphragm, many effects related to the burst of diaphragm can influence formation, thus preventing an ideal pressure step change, as predicted by tube measurement model being generated. This paper presents newly developed diaphragmless quick-acting pneumatic valve, which demonstrates several advantages over diaphragm. The tests were performed using nitrogen at atmospheric initial driven pressure, and driver gauge pressures from 1 MPa 7 MPa. results show...
Technological progress demands accurate measurements of rapidly changing pressures. This, in turn, requires the use dynamically calibrated pressure meters. The shock tube enables dynamic characterization by applying an almost ideal step change to sensor under calibration. This paper evaluates effect response a side-wall measurement system on detection wave passage times over sensors installed along tube. Furthermore, it this reference signal determined at end-wall driven section using...
This paper gives an overview of the ongoing Joint Research Project (JRP) 20IND11 "Metrology infrastructure for high pressure gas and liquefied hydrogen flows" (MetHyInfra), which will ensure traceability in distribution chain. For this purpose, very precise nozzles with well-defined geometries have been produced. In project, Critical Flow Venturi Nozzles (CFVNs) be traceably calibrated first time pressures up to 100 MPa using a Coriolis Meter (CFM) as secondary standard. A CFM has...
Abstract A connecting tube between the measured object and pressure sensing element is a common component part of measurement systems. Dynamic characteristics resulting fluid oscillator may significantly influence magnitudes dynamic errors. This paper presents an experimental analysis tubes different lengths diameters. Inlet step changes were generated by system two loudspeakers, responses piezoelectric system. Using responses, characteristic natural frequencies damping under discussion...
To link traceable flow calibrations of Coriolis meters at ambient conditions to measurements in cryogenic, liquid hydrogen (LH2) applications, physical effects very low temperatures on the calibration factor must be satisfactorily predicted by temperature correction methods. In this paper, four models are investigated, which differ sense they cover and how these determined. These were applied three meter designs – straight, arc U-tube. As a reference value evaluation, we use simulation...
Pressure sensors often have to be placed at a certain distance from the measured object, which means that fluid in any connecting tube and volume of sensor represent constituent part pressure measurement system. This paper deals with improvements modelling frequency characteristics such systems using gases or liquids as transmission fluids. The Bergh–Tijdeman mathematical model, represents state art for studying dynamics tube, was supplemented contributions thermodynamic effects compliance...
In many industrial applications pressure sensors often have to be placed at a certain distance from the measured object and tube that connects sensor is then component part of measurement system. The dynamic response such system depends on properties transmission fluid, characteristics connecting volume. This paper experimentally validates an improved mathematical model supplements Bergh Tijdeman with frequency-dependent thermodynamic effects gas density changes in quality was evaluated...