Fluid Mechanics of Flow Metering

Merzkirch, W.; Gersten, Klaus; Peters, F.; Ram, V. Vasanta; Lavante, E. von; Hans, Volker

doi:10.1007/b138000

Cited by 27 publications

(22 citation statements)

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“…It is shown in Fig.4 that the optimal coordinates of the location of the extreme APs (AP1 and AP3 in Fig. 2, b) of the three-path chordal USM are values x 1,3 in the range ± (0.64... 0.65)R (δ GD <0.1 %).…”

Section: Investigation Of the Hde Of Usmmentioning

confidence: 99%

“…Sensitivity of ultrasonic flowmeters (USMs) to the profile of flow velocity is described in many domestic [1][2] and foreign [3][4][5][6] scientific works. Thus, in the case of USM under the conditions of undistorted flows, a hydrodynamic flow measurement error (HDE) occurs [5], and under the conditions of perturbation of the structure of the velocity profile of various local pipe fittings, an additional flow measurement error (AE) arises due to the distortion of the flow structure [6].…”

Section: The Purpose Of the Workmentioning

confidence: 99%

“…The formula for the analytic-empirical power law of the distribution of the velocity of the undistorted flow has the following form [3]:…”

Section: Investigation Of the Hde Of Usmmentioning

confidence: 99%

“…The volumetric flow rate expenditure flowing through the cross-section of MPL can be obtained by integrating the power law of distribution (1) [3]:…”

Section: Investigation Of the Hde Of Usmmentioning

confidence: 99%

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Reduction of Hydrodynamic Flow Measurement Error of Chordal Ultrasonic Flowmeter

Матіко¹,

Роман²,

Kovalchuk³

2017

Energy eng. control syst.

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In this work, ways of reducing the hydrodynamic flow measurement error of chordal ultrasonic flowmeter for the distributed location schemes of their acoustic paths are investigated. The method of calculating optimal location coordinates of the acoustic paths of ultrasonic flowmeters is considered in detail, using the analytical-empirical power law of the distribution of the velocity of the undistorted flow. As a result of the work, the authors calculated the optimal arrangement of acoustic paths for chordal schemes of two-and three-path ultrasonic flowmeters. It was established that optimization of the location scheme of the acoustic paths of chordal ultrasonic flowmeters allows reducing the hydrodynamic flow measurement error to the value of 0.05 % (for two-path flowmeters) and 0.1 % (for three-path). The developed approach is convenient when designing multipath ultrasonic flowmeters and their research in laboratory conditions. Keywords: ultrasonic flowmeter; hydrodynamic error; power law; acoustic paths; chordal scheme. The purpose of the workSensitivity of ultrasonic flowmeters (USMs) to the profile of flow velocity is described in many domestic [1][2] and foreign [3-6] scientific works. Thus, in the case of USM under the conditions of undistorted flows, a hydrodynamic flow measurement error (HDE) occurs [5], and under the conditions of perturbation of the structure of the velocity profile of various local pipe fittings, an additional flow measurement error (AE) arises due to the distortion of the flow structure [6].The purpose of this work is to investigate one of the ways to reduce the HDE of the USM. Presentation of the materialThe occurrence of the HDE of the USM is due to the fact that the velocity of the flow, calculated from the value of passing of sound vibrations over and against the flow along its acoustic paths (APs) u L , is always different from the actual value of the flow velocity of the averaged over the diameter of the measuring pipeline (MPL) [5]. The relationship between these velocities does not depend on the angle of inclination of the AP to the axis of flow, but is determined by the number of Re and the location scheme of the APs USM (the number of APs and the way of their spatial arrangement).Currently, a significant number of location schemes of APs USM are proposed. We have carried out the classification of known location scheme of APs USM (see Fig. 1) and analysis of possible values the HDE of the USM for different location scheme.

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Section: Investigation Of the Hde Of Usmmentioning

confidence: 99%

Section: The Purpose Of the Workmentioning

confidence: 99%

“…The formula for the analytic-empirical power law of the distribution of the velocity of the undistorted flow has the following form [3]:…”

Section: Investigation Of the Hde Of Usmmentioning

confidence: 99%

“…The volumetric flow rate expenditure flowing through the cross-section of MPL can be obtained by integrating the power law of distribution (1) [3]:…”

Section: Investigation Of the Hde Of Usmmentioning

confidence: 99%

See 2 more Smart Citations

Reduction of Hydrodynamic Flow Measurement Error of Chordal Ultrasonic Flowmeter

Матіко¹,

Роман²,

Kovalchuk³

2017

Energy eng. control syst.

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“…The reason is that during the measurement process anemometer makes obstacle to the flow which then makes quicker streamlines. Next reason is due to swirling stress caused by aerodynamic forces on the rotor blading [13]. This fact and uncertainty of both methods make above mentioned difference non essential for purposes of this article.…”

Section: Measurement On Samplementioning

confidence: 99%

CFD validation by measurement of specialized ventilation equipments on duct tract

Sehnálek

2017

MATEC Web Conf.

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Abstract. This article describes measurement of HVAC distribution box on air duct track in Laboratory of Environmental Engineering (LEE). Firstly, the paper describes the LEE and then measurement apparatus with description of calculation methods. Then follows specification of sample with introduction to newly developed equipment for positioning of the anemometer. The evaluation of results of measurements with CFD comparison follows. The article is concluded with discussion over measured data with an outline for further research.

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Measuring fluid flow and heat output in seafloor hydrothermal environments

et al. 2015

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We review techniques for measuring fluid flow and advective heat output from seafloor hydrothermal systems and describe new anemometer and turbine flowmeter devices we have designed, built, calibrated, and tested. These devices allow measuring fluid velocity at high‐ and low‐temperature focused and diffuse discharge sites at oceanic spreading centers. The devices perform at ocean floor depths and black smoker temperatures and can be used to measure flow rates ranging over 2 orders of magnitude. Flow velocity is determined from the rotation rate of the rotor blades or paddle assembly. These devices have an open bearing design that eliminates clogging by particles or chemical precipitates as the fluid passes by the rotors. The devices are compact and lightweight enough for deployment from either an occupied or remotely operated submersible. The measured flow rates can be used in conjunction with vent temperature or geochemical measurements to obtain heat outputs or geochemical fluxes from both vent chimneys and diffuse flow regions. The devices have been tested on 30 Alvin dives on the Juan de Fuca Ridge and 3 Jason dives on the East Pacific Rise (EPR). We measured an anomalously low entrainment coefficient (0.064) and report 104 new measurements over a wide range of discharge temperatures (5°–363°C), velocities (2–199 cm/s), and depths (1517–2511 m). These include the first advective heat output measurements at the High Rise vent field and the first direct fluid flow measurement at Middle Valley. Our data suggest that black smoker heat output at the Main Endeavour vent field may have declined since 1994 and that after the 2005–2006 eruption, the high‐temperature advective flow at the EPR 9°50′N field may have become more channelized, predominately discharging through the Bio 9 structure. We also report 16 measurements on 10 Alvin dives and 2 Jason dives with flow meters that predate devices described in this work and were used in the process of their development. This includes the first advective measurements in the Lau Basin and at the EPR 9°39.5′N. We discuss potential error sources and how they may affect the accuracy of measurements by our devices and other devices. In particular, we use the turbulent plume theory to evaluate the effect of entrainment of ambient seawater.

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Fluid Mechanics of Flow Metering

Cited by 27 publications

References 0 publications

Reduction of Hydrodynamic Flow Measurement Error of Chordal Ultrasonic Flowmeter

Reduction of Hydrodynamic Flow Measurement Error of Chordal Ultrasonic Flowmeter

CFD validation by measurement of specialized ventilation equipments on duct tract

Measuring fluid flow and heat output in seafloor hydrothermal environments

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