Xingen Wang, Yuming Shen, Chaojian Tao, Fuwei Wu
Several computation models for calculating the compressibility factor of high-pressure hydrogen are discussed,including linear equation, Virial Equation, Van der Waals Equation and Redlich and Kwong Equation. ConvertingNIST hydrogen density data to compressibility factor data, the compressibility factor data calculated by the models are compared with NIST data. The computation accuracy of Redlich and Kwong’s Equation is less than 1 % in a wide range of temperature and pressure. The hydrogen compressibility factor data from NIST can be fitted into a linear equation with linear error < 0.55 %...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.067
· Download
Q. Pan, W. D. Lin, Y. Liu, L. Q. Zhang, J. M. Wang, J. Peng
The increasing demand for ultrasonic flow meter (UFM) is due to the absence of moving, protruding parts projecting into the measured flow, transient response, high accuracy and wide range, so that it becomes important in flow measurement. By analyzing the error sources and magnitude of measurements in water, considering the uncertainty caused by sound speed profile and standard length, comprehensively. This research proposes a method to trace the transit time to standard length. Firstly, based on the servo driving and automatic displacement control, a facility which can provide displacement...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.066
· Download
S. H. Lee, J. Rauch, B.-R. Yoon
This study was conducted to compare the viscosity measurement standard systems of the KRISS and PTB, as well as to confirm the international equivalence of the standard viscosity measurement system built in the KRISS. The KRISS constructed a viscosity measurement standard system using an Ubbelohde-type capillary viscometer. In the KRISS, the viscometer was calibrated based on the water viscosity standard ISO TR 3666, and 16 viscometer coefficients were obtained using the step-up method. The measured viscosity was corrected by evaluating the surface tension, buoyancy, and kinetic energy. The...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.065
· Download
D. L. Liu, Q. Cai, J. Wang,H. M. Hu
The verification medium of vortex flowmeter in the laboratory is often different from the actual measurement. It is very important and necessary to quantitatively analyze the influence of the medium type on its measurement performance. So it is very important and necessary to quantitatively analyze the influence of medium type on its metering performance. The instrument coefficient and indication error of the same vortex flowmeter are verified by water, diesel and air at different flow velocity points, and the measurement performance difference is analyzed which caused by the medium type....
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.064
· Download
Nuolin Xiang, Suna Guo, Chenguang Song, Longlong Wang
Because of its simple structure and ability to measure in reverse, orifice flowmeters are widely used in petroleum, chemical and other fields. In the measurement, the pipeline flow state instability occurs, which has a greater impact on the measurement performance of the orifice flowmeter. In order to study the influence of dynamic flow on the dynamic characteristics of orifice flowmeter. Based on CFD simulation, the dynamic characteristics of orifice flowmeter with different throttling ratio (β) under sinusoidal pulsating flow conditions is studied. Through the simulation of the internal...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.063
· Download
S. Neuhaus, H. Bissig, B. A. Bircher, M. de Huu
Calibration of flow devices is important in several areas of pharmaceutical, flow chemistry and HPLC applications where dosage of process liquids or accurate measurement of the flow rate are important. The process-oriented liquid itself might influence the performance of the flow device. Therefore, the calibration of the flow meter or microfluidic device with the process-oriented liquid is important and the simultaneous determination of the dynamic viscosity under flow conditions is a valuable information for viscosity dependent flow metering methods or other process parameters. To offer the...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.062
· Download
H. Bissig, O. Büker, K. Stolt, E. Graham, L. Wales, A. Furtado, S. Moura, Z.Metaxiotou, S. H. Lee, S. Kartmann, J. Groenesteijn, J. C. Lötters
Microfluidic devices are gaining importance in various fields of pharmacy, flow chemistry and healthcare. In the embedded microchannel, the flow rates, the dynamic viscosity of the transported fluids and the fluid dynamic properties play an important role. Various auxiliary functional components of microfluidic devices such as flow restrictors, valves and flow meters need to be characterised with liquids used in several microfluidic applications. However, calibration with water does not always reflect the behaviour of the fluids used in the different applications. Therefore, several National...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.061
· Download
Yuan Liu, Wenrui Gao, Lei Wang, Heming Hu
The widely used investigation method of fluid boundary layer is to record or simulate the current profile distributions near boundary, and then the loss of velocity can be estimate by integration. A directly measuring method of boundary layer displacement thickness by using ultrasonic transit time instrument is proposed. The problem of boundary layer measurement can be simplified to a easier measurement process of current velocity calibration, and the verification experiments are carried out by taking smooth plate as an example. An experimental platform of towing tank facility is...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.060
· Download
S. Dixon, D. Greenshields, Z. Li, W. Sun, L. D. Smith
Ultrasonic anemometers have a wide dynamic range, no moving parts and potentially high accuracies for measuring wind speed, but can also be used for indoor air flow monitoring. Some designs of ultrasonic anemometer already use flexural ultrasonic transducers (FUTs)- a sensor that is used extensively in car parking sensors as they are low cost, robust and reliable. Ultrasonic anemometers often use a method called transit time difference, where the different transit time generally with or against the air flow gives rise to a transit time difference, that can be used to calculate air flow...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.059
· Download
Zheng Zhang, Miao Miao, Wenjia Li
Pitot tube is a standard instrument commonly used in wind speed measurement, which generally needs to be used in conjunction with wind tunnel. On the premise that the pitot tube coefficient is determined and the performance of other related supporting equipment (digital pressure gauge, temperature and humidity sensor) is stable, it is found that the horizontal installation angle of pitot tube in the wind tunnel will have a significant impact on the measurement of wind speed. This paper designs an experimental method for this kind of phenomenon, summarizes the experimental data, and analyzes...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.058
· Download