Experimental Determination Influence of Flow Disturbances behind the Knife Gate Valve on the Indications of the Ultrasonic Flow Meter with Clamp-On Sensors on Pipelines
Abstract
:1. Introduction
- High measurement accuracy—high sensitivity and resolution;
- Non-invasiveness during operation;
- Non-contact;
- Service life—long-term operation;
- Independence from environmental conditions/system operation conditions;
- Low cost of investment and of operation.
2. Measurements
- With the valve placed in the position of closure of 1/3 of the knife gate valve’s height, one obtains P1/3 = 78.09% of the active flow area;
- With the valve placed in the position of closure of 1/2 of the knife gate valve’s height, one obtains P1/2 = 60.89% of the active flow area.
3. Results
3.1. Measurement Results—½ Closure of the Knife Gate Valve’s Height, Re = 35,000
3.2. Measurement Results—½ of Closure of the Knife Gate Valve’s Height, Re = 70,000
3.3. Measurement Results—1/3 of the Knife Gate Valve’s Height Closed, Re = 35,000
3.4. Measurement Results—1/3 of the Knife Gate Valve’s Height Closed, Re = 70,000
3.5. Comparison of Results from All of the Measurement Series
3.6. Treatment of Results of Laser Anemometry Test
4. Conclusions
- In the measurement series conducted for the ½ closure of the knife gate valve, much larger flow disturbances occurred than in the measurement series conducted for the 1/3 closure of the valve. These observations were also confirmed by the laser anemometry LDA tests. Graphic analysis of the velocity profiles showed an analogy in the flow disturbance structure for both levels of the closure of the valve.
- In the course of the correlation of the K* factor (α) for the series with Re = 35,000 and Re = 70,000, analogies can be noticed. It can be assumed that this correlation is universal for Reynolds numbers in the range of the turbulent flow.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Abbreviation
Symbols | |
C | velocity of ultrasonic wave, m/s |
D | diameter of the pipeline, mm |
…D | measurement cross sections at a distance |
… | pipeline diameters from the knife gate valve, mm |
K* | correction factor |
l | path length of the ultrasonic wave, mm |
L | distance between ultrasonic sensors, mm |
qv | volume flow rate, m3/s |
t | transit time of the ultrasonic wave, s |
Δt | time difference between the flow upstream and downstream, s |
Re | Reynolds number |
V | flow velocity, m/s |
vmes | velocity measured behind the knife gate valve, m/s |
vref | velocity measured in front of the knife gate valve, m/s |
α | angle of the ultrasonic heads setting, ° |
uA | component of the type A uncertainty of the flow velocity measurement, m/s |
uB | component of the type B uncertainty of the flow velocity measurement, m/s |
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Name of Parameter | Parameter |
---|---|
Nominal diameter of the pipeline | DN 50 |
Measurement sections | 3D–15D |
Velocities | ca. 0.3 m/s for Re = 35,000 |
ca. 1.78 m/s for Re = 70,000 | |
The ultrasound wave path | V |
Sampling interval | 5 s |
Distance between sensors | ca. 90 mm |
Knife gate closing level | 1/3 valve height (ca. 22%) |
1/2 valve height (ca. 40%) |
Device | Brand | Model | Specification | Maximum Permissible Error (MPE) |
---|---|---|---|---|
Ultrasonic flow meter | Microsonic | Porta Flow 330 | Transit-time measurement, clamp-on sensors | 0.5% to 2% of velocity reading for v > 0.2 m/s |
Ultrasonic flow meter | Endress+Hausser | Prosonic Flow 93T | Transit-time measurement, clamp-on sensors | 0.5% to 2% of velocity reading for v > 0.3 m/s for Re > 10,000 |
Laser Doppler anemometer | Dantec | One-channel laser Doppler anemometer data | Power of laser: 10 mW Light wavelength: 632.8 nm-red Light focal length: 160 mm Measuring volume: 75 μm × 630 μm | - |
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Piechota, P.; Synowiec, P.; Andruszkiewicz, A.; Wędrychowicz, W.; Wróblewska, E.; Mrowiec, A. Experimental Determination Influence of Flow Disturbances behind the Knife Gate Valve on the Indications of the Ultrasonic Flow Meter with Clamp-On Sensors on Pipelines. Sensors 2023, 23, 4677. https://doi.org/10.3390/s23104677
Piechota P, Synowiec P, Andruszkiewicz A, Wędrychowicz W, Wróblewska E, Mrowiec A. Experimental Determination Influence of Flow Disturbances behind the Knife Gate Valve on the Indications of the Ultrasonic Flow Meter with Clamp-On Sensors on Pipelines. Sensors. 2023; 23(10):4677. https://doi.org/10.3390/s23104677
Chicago/Turabian StylePiechota, Piotr, Piotr Synowiec, Artur Andruszkiewicz, Wiesław Wędrychowicz, Elżbieta Wróblewska, and Andrzej Mrowiec. 2023. "Experimental Determination Influence of Flow Disturbances behind the Knife Gate Valve on the Indications of the Ultrasonic Flow Meter with Clamp-On Sensors on Pipelines" Sensors 23, no. 10: 4677. https://doi.org/10.3390/s23104677