Showing papers in "Flow Measurement and Instrumentation in 2002"

TL;DR: In this article, a particle image velocimetry (PIV) was used to measure the flow dynamics at the surface of shallow water flows over a large measuring field, which made it possible to track two-dimensional large coherent structures, which are dominating flow phenomena in many shallow flow applications.

TL;DR: In this article, the authors present seven correlations, two recent wet gas Venturi correlations and five older Orifice Plate general two-phase flow correlations and compare their performance with new independent data from the NEL Wet Gas Loop with an ISA Controls Ltd. 6 inch Venturi meter of 0.55 beta ratio installed.

TL;DR: In this paper, the principles of operation, application of acoustic Doppler profilers to the measurement of velocity and discharge, and calibration and verification issues are described, as well as the calibration issues.

TL;DR: The Guidelines identify the range of possible non-invasive technologies which can be employed for the measurement of pipe flows and installation, pipework, fluid and operational effects on clamp-on transit time ultrasonic flowmeters, together with effects which may be specific to particular manufacturers.

TL;DR: In this paper, a method to extend this range by avoiding singularity is developed allowing calibration of a five-hole probe up to much larger angles of pitch and yaw, which can be successfully extended to angles of up to ±75°.

TL;DR: In this article, an alternating-current electromagnetic flowmeter was designed and manufactured to investigate the characteristics of an electromagnetic flow meter in two-phase flow, in which a rod-shaped nonconducting material was used, and the effect of bubble position and void fraction on the flow meter was investigated.

TL;DR: In this article, the authors used the International Association of Hydrological Sciences (IAHS) world Catalogue of maximum floods to produce a world envelope curve, which is then used for the design of flood protection works.

TL;DR: In this paper, the uncertainty of the measurements is reported as a combined uncertainty with symbol u i and a coverage factor of 2 corresponding to a confidence level of approximately 95% and the results of the analysis of Type A and Type B methods of evaluation of uncertainty are reported.

TL;DR: This article presents a comprehensive state-of-the-art review of the important laboratory experimental and theoretical investigations on free overfall in various channels highlighting the hydraulic background and the mathematical treatment of the problem.

TL;DR: In this paper, the distinct flow types, modular flow and non-modular flow, are described and applied to derive the head-discharge relations of weirs with a horizontal crest.

TL;DR: In this article, the authors provide and verify a simulation model of the overall signal, so that different frequency-tracking methods can be compared and evaluate the performance of a zero-crossing algorithm.

TL;DR: In this paper, the authors derived approximate, analytically expressed, theoretical characteristics for a straight, slender-tube Coriolis meter, which can be applied to any of its working modes.

TL;DR: In this paper, two methods are presented for the computation of end-depth and discharge of a free overfall from smooth circular channels with flat base, based on the momentum equation and the Boussinesq approximation.

TL;DR: In this paper, the importance of a continuing dialog between information users and those responsible for hydrometric data acquisition in order to capitalize fully on the network infrastructure and data processing capabilities is highlighted.

TL;DR: In this article, a thermal mass bypass flow meter is described, with details of its design, principle of operation, calibration, and testing of effects of ambient temperature and orientation on its performance.

TL;DR: In this paper, a non-contact method for measuring surface velocity and discharge in a natural channel was described, based on the assumption that the vertical velocity distribution follows a universal power or logarithmic law.

TL;DR: In this article, the authors investigated the behavior of a single bubble and liquid around it by using flow visualization and image processing methods and found that the bubble motion is influenced by several factors, that is, bubble size, density difference between gas and liquid, bubble shape and deformation in motion.

TL;DR: In this paper, a theoretical analysis for one-dimensional flows and a numerical analysis for two-and three-dimensional flow fluctuations are given, based on the assumption of an homogeneous particle distribution in the flow and a Gaussian distribution of fluctuating velocities.

TL;DR: In this article, a comparison of the performance of different flow conditioners, independently from their effects on particular flowmeters, is presented, where the authors propose the use of several efficiency parameters to evaluate and compare flatness, uni-directionality and axi-symmetry of the velocity profiles produced downstream from the conditioners.

TL;DR: In this article, the authors present a summary of the various commercially available and near-market options available for measurement in partially filled conduits, including volumetric methods, tracer and dilution methods, use of gauging structures, ultrasonic Doppler and transit time, electromagnetic methods, slope-area methods and non-contact methods.

TL;DR: In this article, a vortex meter was placed downstream of two elbows out-of-plane, at Reynolds numbers between 7.8×10 4 and 2.1×10 5.

TL;DR: It is shown, experimentally, that the adopted wavelet-based filtering algorithm reduces the level of noise in the data by 80–90% and the suitability and necessity of wavelet filtering are illustrated.

TL;DR: In this paper, the effect of temperature on the coefficient used to characterise small sonic nozzles was investigated using a gas flow standard that can operate in continuous mode, measurements were made of the change of the nozzle coefficient with temperature.

TL;DR: In this paper, an improved method of determining cross-sectional depth and discharge of a river was presented and applied using the universal law and Darcy-Weisbach friction factors to obtain the lateral variation of the roughness height.

TL;DR: In this paper, the concept of an orifice meter whose performance is independent of the inlet conditions by the introduction of a standard swirl before the meter is described, and a proposal for a new calibration equation is also made for the particular swirler employed.

TL;DR: The variable area orifice meter as discussed by the authors indicates the flow rate as a linear displacement of a symmetrical body placed concentrically downstream of an orifice inside a constant area duct.

TL;DR: In this article, the authors evaluated the suitability of a low-cost prototype anemometer for use in a mushroom growth environment using case studies on two prototype airspeed sensors.

TL;DR: In this article, the weight vector theory for Coriolis mass flowmeters is applied to a simple theoretical meter configuration consisting of a single unsupported straight tube unattached to adjacent piping.

TL;DR: In this article, a model of release of the gas dissolved in the liquid phase during two-phase flow through a Venturi tube is proposed, and the analytical solution for a proposed model for the pressure drop is obtained.