A multi-loop flowmeter is designed for the flowrate measurement of the gas-liquid two-phase flow. The differential pressure signals can be collected from the multiloop sensor at different positions. The total flowrate measurement model is established according to the average differential pressure value obtained from the optimal position. The time serial of the signals is obtained by using the high speed data capture device. A non-dimensional characteristic value related to the root-mean-square of the dynamical differential pressure signals is obtained. The relationship between this value and...
XVIII IMEKO World Congress · TC9 · 2006 · Download
This paper describes an 8-path ultrasonic flow meter, with emphasis on how this meter can be used as a master meter with traceability to appropriate standards. In particular the paper describes the methodology whereby transit time measurements and calibration factors can be established in factory and laboratory tests and then verified in the field. Simulations of distorted and swirling flows, and supporting test results are used to demonstrate the insensitivity of the 8-path configuration to installation effects.
XVIII IMEKO World Congress · TC9 · 2006 · Download
This paper presents a flowmeter design applicable for measurement of low gas flow amounts. The designed flowmeter with a time – of – flight sensor represents a microcomputer application with a control and evaluation procedure. The mathematical model of energy and temperature balance is simulated in the FEMLAB environment. The designed measurement device was used for research of reaction kinetics of biodegradation reactions successfully.
XVIII IMEKO World Congress · TC9 · 2006 · Download
A new non-destructive method was developed for the detection of refrigerant leakage at an evaporator’s inflow. Nitrogen and oxygen gas were blown through the evaporator in successive time intervals. A gas analyser was applied at the outflow of the evaporator and the oxygen concentration measured. It was possible to detect any leakage by investigating the oxygen concentration-time history diagram.
XVIII IMEKO World Congress · TC9 · 2006 · Download
Gerald Steiner, Frank Podd, Markus Brandner, Daniel Watzenig
Ultrasound process tomography is a method for imaging the acoustic impedance or sound velocity distribution within a closed pipe or vessel. It can be used for the determination of process parameters, like flow rates and material fractions, in industrial multi-phase flows. Many approaches are based on reflection measurements and the assumption of piece-wise constant acoustic impedance distributions. For this configuration we present a novel iterative approach for image reconstruction. Reflecting objects, like gas bubbles, are modeled by B-spline contours. The inverse problem of determining...
XVIII IMEKO World Congress · TC9 · 2006 · Download
Investigations of phenomena appearing in the vortex meter are considered in the paper. The hot-wire anemometer system has been used in the laboratory tests. Informations yielded due to spectral analysis of measuring signal facilitate interpretation of test results obtained in experiments and hence better understanding of phenomena is feasible. Results of laboratory investigations carried out on the measuring stand are presented.
XVIII IMEKO World Congress · TC9 · 2006 · Download
Dual fueled engine test procedures and result interpretation are not available in the literature, This paper describes a methodology for calculating the emission mass flow rates, using the chemical reaction mass balance of the components. The experimental data were obtained from tests made at the MWM dynamometer. Starting from basic principles, the hydrocarbon (HC) mass flow rate was related to molar concentration through the molecular mass and the exhaust gas mass flow rate, and compared to the available expressions in the EPA diesel engine test standard. The dual fuel model was established...
XVIII IMEKO World Congress · TC9 · 2006 · Download
Lars Buettner, Christian Bayer, Katsuaki Shirai, Andreas Voigt, Juergen Czarske
We report about a novel laser Doppler field sensor, which is capable of measuring the three-component (3C) velocity field in fluid flows in a twodimensional area (2D) without mechanical scanning and without using a camera. The sensor is based on laser Doppler velocimetry but employs four superposed fan-like interference fringe systems. A spatial resolution in the sub-micrometer range can be achieved enabling highly spatially resolved flow studies. Possible applications are investigations in micro-fluidics or precision flux measurements.
XVIII IMEKO World Congress · TC9 · 2006 · Download
New principle of the particle size distribution measurement is described. We analyze acoustic emission signal generated by a flow of particles impacting on a fixed obstacle. Changes of the power spectral density of the signal are well correlated with the particle size distribution. Our method was successfully used for measurement of particle size distribution in the range from 1mm to 10 mm of the ferrous sulphate monohydrate in real chemistry process. Particles were measured at the output of the dry kiln (temperature 150-200 °C, mass flow 4 tons/hour), where it is not possible to use any of...
XVIII IMEKO World Congress · TC9 · 2006 · Download
Will Almeida, Bruno Costa, Raimundo Freire, Francisco Santos, Sebastian Catunda
The wind tunnel development with wind speed control is presented in this paper using an ultrasonic anemometer. It were used the Time Difference and Phase Difference methods in the measurement of the air speed, and the circuit used for the measurement as for the speed control it was based on a microcontroller and an motor (fan). The experimental results obtained from the proposed circuit are compared with a commercial anemometer. The analysis of temporal response performance of the fan speed control circuit was developed to validate the proposed system.
XVIII IMEKO World Congress · TC9 · 2006 · Download