Showing papers in "Flow Measurement and Instrumentation in 2008"

TL;DR: In this paper, large scale particle image velocimetry (LS-PIV) is used to measure the surface flow velocities in a mountain stream during high flow conditions due to a reservoir release.

TL;DR: In this article, a flow visualization facility based on X-ray imaging was developed to study, characterize, and measure various flow characteristics in large vertical systems that have internal diameters of up to 32 cm and are as tall as 4 m.

TL;DR: In this paper, a new post-processing technique was developed for turbulence analysis of estuarine flows, and it was tested for several field studies, and the results demonstrated that acoustic Doppler velocimetry data cannot be used without suitable postprocessing in unsteady estuary flows.

TL;DR: In this paper, an in-line ultrasound Doppler-based UVP-PD rheometry method was evaluated for non-invasive, real-time theological characterization of complex model and industrial suspensions.

TL;DR: In this paper, an inexpensive and accurate technique for Large-Scale Particle Image Velocimetry (LSPIV) was developed to measure the surface velocity field in 2D.

TL;DR: In this article, the authors proposed a measurement technique for two-phase bubbly and slug flows using ultrasound, which employs a unique ultrasonic transducer referred to as multi-wave transducers (TDX).

TL;DR: In this paper, the four-point optical probe and the developed data processing algorithm for the measurement of bubble dynamics were validated by video imaging and it was found that the distribution of bubble velocities, specific interfacial area and local gas holdup obtained by the probe match well with the data obtained by video images.

TL;DR: In this paper, a fast-sampling (250 Hz) gamma densitometer was installed at the top of the 10.5 m high, 108.2 mm internal diameter, stainless-steel catenary riser in the Cranfield University multiphase flow test facility.

TL;DR: In this paper, the authors measured the pulsed ultrasound Doppler based velocity profile (UVP) and pressure drop (PD) in a pipe section and continuously recorded the velocity of sound, attenuated amplitude of the transmitted signal and temperature.

TL;DR: In this article, the authors used computational fluid dynamics to obtain the location of flow separation and the differential pressure between ports of the annubar of an averaging Pitot tube, where mesh concentration, turbulence models and turbulence intensity level at the inlet were taken into consideration.

TL;DR: In this paper, an automatic three-dimensional (3D) sound field measurement system has been developed, and an experimental study has been conducted on ultrasonic properties by using this system, ultrasonic sound pressure distributions and radiation angles in water have been measured.

TL;DR: The principles of testing procedures are outlined, and their implementation in an experimental benchmark is presented, along with the results obtained on a panel of flow-meters.

TL;DR: This study introduces an efficient approach to estimate the friction coefficient via an artificial neural network, which is a promising computational tool in civil engineering and shows that the proposed approach is in good agreement with the experimental results when compared to the conventional ones.

TL;DR: In this paper, an experimental study on the turbulent flow field in the vicinity of structures mounted on the bottom of a rectangular open channel is presented, where three model structures used in this study have geometric porosities (e ) of 0, 34.9% and 47.5%.

TL;DR: In this paper, an ultrasonic pulse Doppler flow meter was used to measure velocity profiles in a steel penstock with a diameter of over one meter and Reynolds number of more than five million, and two transducers were placed on the pipe surface to validate the multi-line measurement of asymmetric flow.

TL;DR: In this article, a dimensional analysis on two phase flow through a horizontally mounted Venturi meter is performed, and the derived dimensional groups are compared and related to those used in existing DP meter two-phase flow models and correlations.

TL;DR: In this article, a comparison between the two alternative CNG measurement approaches (volumetric versus mass flow metering) is carried out, and the main results of a case study are presented and illustrated.

TL;DR: In this paper, the Strouhal number of nine dual combinations based on triangulate bluff body geometries of different size for a range of separations between 35 and 65 mm was evaluated.

TL;DR: In this paper, an electrical impedance tomography (EIT) was used to image the mixing of two miscible liquids in a turbulent flow, using the Trumpjet mixing system of papermaking chemicals and additives.

TL;DR: An analytical model of an ultrasonic cross-correlation flow meter has been developed to relate the time delay measured by the meter to the mean velocity profile and statistical properties of turbulent pipe flow as mentioned in this paper.

TL;DR: In this article, the governing equations of flow acoustics including nonlinearities are solved and analyzed in terms of ultrasonic flow-measurement properties for gas-flow measurement applications as gas-sound speeds are much smaller while fluid flows generally are much higher.

TL;DR: An analytical model of an ultrasonic cross-correlation flow meter has been developed to relate the time delay measured by the meter to the mean velocity profile and statistical properties of turbulent pipe flow.

TL;DR: Takeda et al. as discussed by the authors used the Doppler shift effect to resolve the quasi-instantaneous flow field in hydraulics, which is used in various fields of research.

TL;DR: In this article, the fluid oscillation characteristics of a diameter 50mm swirlmeter in oscillatory and steady flows were investigated using two axisymmetrical setting piezoelectric press sensors.

TL;DR: In this article, an Electrical Capacitance Tomography (ECTomography) sensor is presented for the reconstruction of the permittivity distribution in a piping system, and two suitable front-end circuit concepts for the sensor are investigated.

TL;DR: In this paper, the authors presented numerical and experimental tests of a new averaging Pitot tube and selected a geometric profile that gives a relatively high differential pressure from a number of sensor cross-sections.

TL;DR: In this article, the authors used large scale particle image velocimetry (LSPIV) for the first time to measure characteristics of large-scale eddies using a gravel-bed flume.

TL;DR: In this paper, the rotor-blade driving torque and the meter factor of a tangential type turbine flowmeter are both deduced in theory based on computational fluid dynamics (CFD) and a turbulence model.

TL;DR: The use of air bubbles for the analysis of the turbulence in the suction chamber of a gear pump with Time Resolved Particle Image Velocimetry (TRPIV) is considered in this article.

TL;DR: In this article, an image reconstruction algorithm that considers the errors in both sensitivity field matrix and capacitance values based on the regularized total least squares method for electrical capacitance tomography is presented.