Li-hua Piao, Tao Zhang, Tong Guo, Xiao-zhong Li, Xing Chen
The orifice rotameter indicates the flowrate as a displacement of a symmetrical body(float) placed concentrically downstream of an orifice inside a vertical tube. Experiments study had been performed at five positions of the float to evaluate the performance of the most commonly used type of orifice rotameter. The computational fluid dynamics (CFD) method was employed to optimize the performance of orifice rotameter. A total of 20 numerical models were established corresponding to the five positions, four types of orifice rotameter. At the same position, the floats of four types of numerical...
Zhen Wang, Tao Zhang
A new method is presented in this paper for improving the linearity of the turbine flowmeter by optimizing the geometric parameters of the rotor. An objective function is defined to improve the linearity. Four characteristic parameters: the ratio of the blade tip space to pipeline radius, the ratio of the rotor hub radius to the blade tip radius, the fitted angle of the blade at the mean square root radius and the cascade solidity of the blade tip, are used to optimize the rotor design according to the n dimension extremum complex configuration optimization method and the turbine flowmeter’s...
Iryna Gryshanova
Computational fluid dynamics (CFD) techniques provide investigations in conditions where the real experiment can't be fulfilled for some reasons, so these tools have found their applications in many spheres of science and technology; in particular they are widely used in flow metering. Some of CFD applications we would like to propose and discuss in this work in the context of turbine and ultrasonic meters. We discover non-drag type of turbine flow meters to check if created design with hydro-dynamic bearings should provide really floating rotor. For this purpose only numerical research can...
F. Koschmieder, H. Röck
Coriolis mass flow meters (CMFM) are characterized by high accuracy and the ability to measure density and mass flow simultaneously. The sensitivity and zero point of the CMFM may change due to temperature gradients along the measuring pipe or mounting conditions. These changes have to be detected and corrected in order to as- sure high accuracy. A model based approach to estimate the zero point during normal operation and one-phase flow is presented. The approach exploits two characteristics of the measuring device: firstly the impact of mass flow upon the oscillation in the 2 nd mode when...
Tao Wang, Yousif Hussain
Coriolis flowmeters had been mainly developed and used in line sizes less than DN100 (or 4-inch) because the size of the flow sensor itself could become too unwieldy and expensive for practical uses. This paper specifically reports the latest research and development of using the straight-tube Coriolis technology to extend flow measurement capacity to a high flow range. Design of the Coriolis flow sensor using a straight-tube configuration is firstly presented. Then, description of a special calibration procedure used in the manufacturer’s gravimetric water flow rig is provided. Finally, an...
Dean M. Standiford, Mark Lee
Inter-laboratory comparison testing is fundamental to assuring the accuracy of a laboratory’s stated measurement uncertainty, and a requirement for accreditation to ISO/IEC 17025:2005. Inter-laboratory comparisons using Micro Motion, Inc. (MMI), Coriolis mass flow meters support the claimed uncertainties of 0.014% ( k = 2) for the high-accuracy liquid flow calibration facilities, and 0.03% ( k = 2) for the production flow calibration facilities at Micro Motion, Inc.. This paper describes: multiple calibration methodologies, international traceability to National Metrology Institutes, test...
Vivek Kumar, Martin Anklin, Benjamin Schwenter
In process industries Coriolis mass flow meters (CMFs) are widely employed for measuring mass flow rates. Quite often especially in oil and gas (O&G) industry, owing to fluids with high viscosities, flow measurements may lie in low Reynolds number regions. At low Reynolds numbers (Re), a CMF reading may deviate under the influence of fluid-dynamic forces. With the help of extensive Fluid-Structure- Interaction simulations (FSI), a detailed insight into physical mechanisms leading to this deviation is provided. The main finding is that this deviation is a function of the Reynolds number and...
Li-Jun Wang, Liang Hu, Xin Fu, Peng Ye
It is claimed that Coriolis mass flowmeter (CMF) can accurately measure the mass flow-rate without being effected by temperature. However, evidences from practical industry applications show that sometimes CMFs still suffer so-called "zero drift (ZD) effect": the origin of the flowmeter (reading at zero flow) varies as temperature changing. In this paper, series of experiments are carried out to systematically examine and analyze the performance of a Narrowed-U-CMF in a temp- changing environment. Based on the results of these experiments, possible reasons causing the ZD effect are analyzed,...
Maria H. Farias, Marcos V. B. Ramos, Sandro R. Santoro
The calibration procedures of compact provers, which are used as standards to calibrate volumetric meters, are well known. However, the reduction of uncertainty of measurement in a prover calibration or when using a prover as standard depends on several factors, among them, the way of controlling some quantities, the kind of valves in the hydraulic circuit and how they are operated, the kind of liquid totalizer in calibration etc. In general, position sensors installed close to the initial and final ends of the cylinder ruler of the prover indicate the useful displacement along the tube....
Ki Won Lim, Jin Yong Jun, Byeong-Jun Lee
The calorific value of Natural Gas (NG), as a mixed gas fuel, strongly depends on composition. The composition of NG is mainly methane, ethane, propane, butane and nitrogen, which varies with time and place it was produced. In order to measure the calorific value of NG, a flame calorimeter was manufactured and characterized in this study. For development of the flame calorimeter, the electric substitution method initiated by Alexandrov was applied. Peltier elements on the calorimeter emit the heat supplied by a heater and a flame under the thermal equilibrium state. Freon-11 was used as a...