The meters integration time is usually fairly long, typically around 600 milliseconds, to ensure a relatively gentle and steady meter movement. Flow correlations for horizontal and inclined 2phase flow are. The technology applies to multiphase flow, in which the disturbance is caused, for example, by the passage of a bubble of gas over each sensor. The correlation meter at this point can allow you to narrow the stereo field of that element until you fall into a positive zone not sure what the logic. From doppler measurement to the cross correlation method. Crosscorrelation velocity measurement of horizontal oil. This meter utilizes electrical impedance measurements and gamma densitometry signals to establish oil, gas, and water fractions. Report options number of crosscorrelations specify the number of cross correlations that are calculated and. Simulation and correlation of flowrate measurement in an. Flow measurement using ultrasonic cross correlation.
In this report we have int roduced the xcnn f low meter model, whic h consists of an int egration of. The program describes the complex multiphase flow in reservoir, wellbore, choke, and surface pipe lines. Cross correlation velocity measurement of multiphase flow. Pdf the xcnn flow meter a combined crosscorrelation. The df868 is a fullfeatured, fixedinstallation liquid flow meter designed to meet all your flow metering and energy measurement needs. To enable the development of the improved meter, part of the project was dedicated to the theoretical analysis of the interaction between ultrasonic wave and turbulence in a pipe. Simulation and correlation of flowrate measurement in an ultrasonic heatmeter design is critical to the success of the heatmeter development process. As the correlation meter updates, it paints a history to show the correlation of the left and right channels over time. The cross correlation ultrasonic flow measurement system, shown in figure 2,consists of an adjustable signal generator, two pairs of wideband ultrasonic transducers with a center frequency of 2 mhz, a phase demodulation unit, acorrelator and a recorder. According to the diversity of fluid composition and the complexity of flow pattern of rainwater in the pipeline, a flow velocity measurement method based on crosscorrelation analysis is proposed. Pdf crosscorrelationbased optical flowmeter researchgate. The cross correlation function as defined above is. Ultrasonic flowmeter using crosscorrelation technique.
Flow velocity measurement v using cross correlation the flow velocity determination method is based on the ultrasonic reflection principle. The crosscorrelation meter employs two transverse acoustic signals. P assistant professor karunya university abstract the correlation technique. Compact correlation transittime flowmeter description primeflot operates on the transittime principle that sound waves travelling with the water flow will move faster than those travelling against the flow. Crosscorrelationbased optical flowmeter ieee xplore. Two ultrasonic beams a and b are physically separated. Ultrasonic cross correlation noninvasive flow meter crossflow. Cross correlation flowmeters, their design and application. Theory and application of the ultrasonic crosscorrelation. Masterflow, a new flowmeter especially designed to function in high.
Convection heat transfer reading problems 191 198 1915, 1924, 1935, 1947, 1953, 1969, 1977 201 206 2021, 2028, 2044, 2057, 2079 introduction in convective heat transfer, the bulk. Nivus flow mesurement the development of flow measurement technology. The use of cross correlation for signal processing is. Application of crosscorrelation in velocity measurement. Ultrasonic crosscorrelation flowmeters sciencedirect. It can be shown that this function has a maximum value when the cross correlation lag t is equal to the transit time. Crosscorrelation report this option specifies whether the indicated report is displayed. The crosscorrelation function, r xy, will normally. Crosscorrelation by singlebit signal processing for. The majority of ultrasonic flowmeters ultilize the doppler principle so that the measurement depends upon the value of the velocity of sound in the fluid. The cross correlation has uses in many fields of scientific endeavor music. Flow measurement for water and waste water at highest level. Over the years, we have built an extensive library of flow correlation tables and curves for dozens of gases at numerous conditions.
Hence, the nusselt number and the convection coefficient are 6071 58 45 40. Its patented correlation transittime digital signal. Two parallel laser beams are made to cross a transparent. A comparison of peak expiratory flow measured from forced. The ultrasonic crosscorrelation flow meter, known as crossflown, has been used successfully in nuclear industry for noninvasive flow measurements at. Nivus flow measurement technology with cross correlation. Two parallel 2 laser beams are made to cross a transparent pipe. Many nonintrusive measurement techniques are applied to measure flow velocity, such as cross correlation method 18, ultrasonic method 19, 20, nuclear magnetic resonance method 21, and.
Ultrasonic cross correlation flowmeter rack mounted portable nuclear instrumentation. Crosscorrelation is a tool that is well suited for that specific purpose. The cross correlation velocity evaluation is based on the measurement of transit time of the tagging signals of multiphase flow between two separated sensors. In signal processing, crosscorrelation is a measure of similarity of two series as a function of the displacement of one relative to the other. The reading is then compared to a correlation table for a specific gas or liquid. Convection heat transfer microelectronics heat transfer. Very high accuracy reliable measuring data universal usability for all types of channels and pipes full or part filled. Dept of electrical instrumentation and control engineering, teesside polytechnic. It uses fetkovichs equations for flow in gas reservoirs and vogels or pi equations for flow in oil. Index termscross correlation, flowmeter, fluid flow measure ment, laser beam. One of the most modern and most efficient flow velocity measurement methods is the nivus correlation method. Correlation meter software free download correlation meter top 4 download offers free software downloads for windows, mac, ios and android computers and mobile devices. Then the crosscorrelation of the signals is used to measure individual. This is also known as a sliding dot product or sliding inner.
Nivus flow measurement with cross correlation youtube. A proof that the time delay of cross correlation peak is. The cross correlation flowmeters are generally based on measuring the transit time of a tagging signal in the flow between two axially separated sensors. One of the most modern and most efficient flow velocity. The cross correlation method is the most commonly used for measur ing velocity of the dispersed phases based on the frozen flow hypothesis using two sensors, one of that is positioned downstream. A correlated flowmeter is scaled along either a 65mm or a 150mm length, from which a reading is taken. Eaton for holdup and oliemans for frictional pressure loss 3. In practice, there will be many bubbles of gas, so it is.
Isolating and correcting controller performance issues often starts with eliminating potential culprits. Brighter regions indicate that the correlation meter has spent more time in that area. Pdf in this paper, an optical flowmeter based on the crosscorrelation technique is proposed. Ultrasonic cross correlation flowmeter whtechnologies.
For correlation study, the data from both groups was combined together. The meter is fed the left and right audio channels and displays the. Utilizing these flow correlation tables with a matheson flowmeter will. Analysis by system theory and influence of turbulence. Flow measurement is an extremely important aspect of plant instrumentation, and has in recent years been the subject of intense research activity.
Flow measurement is an economical important aspect of plant instrumentation and use well established techniques that have been commercially available for many years 1. Flow measurement in channel using ultrasonic cross. Crosscorrelation digital particle image velocimetry a. Much of this work has centred on the cross correlation. Correlation meter software free download correlation. The installed emf, which failed to measure at low flow rates due to sludge formation and detected only parts of the flow rates due to impoundage and emergency discharge, was removed. Worch, a clampon ultrasonic crosscorrelation flow meter for one phase flow, measurement science and technology 9, pp. Zobin, theory and application of noninvasive cross correlation flow meter in harsh environment, proceedings of the 9th international. Crosscorrelation, velocity measurement, multiphase flow, electrostatic sensors. Out of various variables, only correlation between the height of the subject and the difference in pef by peak. Crosscorrelation crosscorrelation the crosscorrelation of two real continuous functions. Some researchers also presented their achievement about the crosscorrelation flow meter based on the ultrasonic technology. Density fluctuations in the jet showed significantly higher correlation, than either.
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