scholarly journals Analysis of metrological characteristics of elbow flowmeter under rotating state

2021 ◽  
Vol 12 ◽  
pp. 24
Author(s):  
Yu Wang ◽  
Ruiwei Li ◽  
Lin Luo ◽  
Lin Ruan
Keyword(s):  
Flow Rate ◽  
Measurement Accuracy ◽  
Discharge Coefficient ◽  
Water Flow Rate ◽  
Internal Flow ◽  
Metrological Characteristics ◽  
Centrifugal Acceleration ◽  
Flow Rate Measurement ◽  
Fitting Method ◽  
Cfd Method

The application of elbow flowmeter in rotary equipments is beneficial to reduce the pipeline complexity. However, the intervention of centrifugal acceleration will lead to the change of metrological characteristics of elbow flowmeter. Based on the analysis of the differential pressure formation mechanism of the environmental acceleration on the elbow flowmeter, the calculation formula of the flow rate measurement with the elbow flowmeter in the rotating state is derived, and the fitting method of the discharge coefficient is put forward. The CFD method was used to analyze the internal flow field of the elbow flowmeter under rotating state, summarize the pressure distribution characteristics of the pipe wall, and verify the feasibility of the discharge coefficient fitting strategy by simulation. The results show that for the elbow flowmeters with diameters of 10 mm and 15 mm and the radius to diameter ratio of 1.5, as long as the water flow rate is between 1.5 m/s and 5 m/s, the measurement accuracy can be guaranteed to be above 4%.

scholarly journals NON-INTRUSIVE METHOD FOR MEASURING WATER FLOW RATE IN PIPE

2017 ◽  
Vol 14 (27) ◽  
pp. 44-50
Author(s):  
K. A. R. MEDEIROS ◽  
C. R. H. BARBOSA ◽  
E. C. de OLIVEIRA
Keyword(s):  
Flow Rate ◽  
Water Flow Rate ◽  
Vibration Measurement ◽  
Rate Measurement ◽  
Flow Rate Measurement ◽  
Flow Meters ◽  
Flow Interruption ◽  
Method Of Measurement ◽  
Metrological Validation ◽  
Water Meters

The transducer most widely used for vibration measurement is the piezoelectric accelerometer. This application has been explored for flow rate measurement, since some studies have verified the narrow correlation between ratio of flow and vibration. The technique consists of measure the vibration induced by the flow in the pipeline, has been considered as promising, in the sense of enabling the development of a sensor that presents advantageous characteristics such as non-intrusiveness, non-invasiveness and reduced cost. This paper shows the method of measurement of flow in pipe based on vibration caused by transit of water, without the need of flow interruption or opening of pipe for installation of water meters. Further are present experimental measurements and metrological validation in laboratory accredited for calibration of flow meters.

scholarly journals Unsteady Characteristics of Forward Multi-Wing Centrifugal Fan at Low Flow Rate

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 691 ◽  
Author(s):  
Lun ◽  
Ye ◽  
Lin ◽  
Ying ◽  
Wei
Keyword(s):  
Unsteady Flow ◽  
Flow Rate ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Boundary Layer Separation ◽  
Low Flow ◽  
Centrifugal Fan ◽  
Suction Surface ◽  
Cfd Method ◽  
Low Flow Rate

The unsteady flow characteristics of a forward multi-wing centrifugal fan under a low flow rate are studied using the computational fluid dynamics (CFD) method. This paper emphasizes the eddy current distribution in terms of the Q criterion method, as well as pressure fluctuation, frequency spectrum, and kinetic energy spectrum analysis of internal monitoring points in a forward multi-wing centrifugal fan. The numerical results show that abnormal eddies mainly appear at the volute outlet and near the volute tongue, boundary layer separation occurs near the suction surface of the blade, and shedding eddies appear at the trailing edge of the blade with the time evolution. The unsteady flow characteristics of a forward multi-wing centrifugal fan at a small flow rate provide significant physical insight into understanding the internal flow law.

scholarly journals Impact of Pitot tube calibration on the uncertainty of water flow rate measurement

2015 ◽  
Vol 648 ◽  
pp. 012005 ◽  
Author(s):  
Icaro de Oliveira Buscarini ◽  
Andre Costa Barsaglini ◽  
Paulo Jose Saiz Jabardo ◽  
Nilson Massami Taira ◽  
Gilder Nader
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Water Flow Rate ◽  
Pitot Tube ◽  
Rate Measurement ◽  
Flow Rate Measurement

scholarly journals A Non-Intrusive Ultrasonic Sensor System for Water Flow Rate Measurement

2021 ◽  
Author(s):  
Sergey Mileiko ◽  
Oktay Cetinkaya ◽  
Alex Yakovlev ◽  
Domenico Balsamo
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Water Flow Rate ◽  
Ultrasonic Sensor ◽  
Sensor System ◽  
Rate Measurement ◽  
Flow Rate Measurement

Analysis of Flow Measurement Accuracy by Coaxial Phase Water Detector

2014 ◽  
Vol 971-973 ◽  
pp. 962-964 ◽  
Author(s):  
Jin Qi Wang ◽  
Yu Wei Guo ◽  
Shao Zhong Liu ◽  
Ya Nan Zhang
Keyword(s):  
Flow Rate ◽  
Flow Measurement ◽  
Measurement Accuracy ◽  
Rate Measurement ◽  
Flow Rate Measurement ◽  
Actual Measurement ◽  
Turbine Flowmeter ◽  
Phase Water

The principle through the turbine flowmeter,establish a relationship between the flow rate measurement of Coaxial phase water detector,calculate the actual measurement accuracy,and for several factors affect the accuracy of experiments were carried out,obtained the pattern of flow measurement.

scholarly journals Effect of Water Flow on Underwater Wet Welded A36 Steel

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 682
Author(s):  
Eko Surojo ◽  
Aziz Harya Gumilang ◽  
Triyono Triyono ◽  
Aditya Rio Prabowo ◽  
Eko Prasetya Budiana ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Flow ◽  
Flow Rate ◽  
Water Flow Rate ◽  
Physical And Mechanical Properties ◽  
Shielded Metal Arc Welding ◽  
Effect Of Water ◽  
Bending Effect ◽  
Metal Arc Welding ◽  
A36 Steel

Underwater wet welding (UWW) combined with the shielded metal arc welding (SMAW) method has proven to be an effective way of permanently joining metals that can be performed in water. This research was conducted to determine the effect of water flow rate on the physical and mechanical properties (tensile, hardness, toughness, and bending effect) of underwater welded bead on A36 steel plate. The control variables used were a welding speed of 4 mm/s, a current of 120 A, electrode E7018 with a diameter of 4 mm, and freshwater. The results show that variations in water flow affected defects, microstructure, and mechanical properties of underwater welds. These defects include spatter, porosity, and undercut, which occur in all underwater welding results. The presence of flow and an increased flow rate causes differences in the microstructure, increased porosity on the weld metal, and undercut on the UWW specimen. An increase in water flow rate causes the acicular ferrite microstructure to appear greater, and the heat-affected zone (HAZ) will form finer grains. The best mechanical properties are achieved by welding with the highest flow rate, with a tensile strength of 534.1 MPa, 3.6% elongation, a Vickers microhardness in the HAZ area of 424 HV, and an impact strength of 1.47 J/mm2.

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