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Wednesday, July 29, 2020 | History

2 edition of Flow rate, void fraction and bubble size measurement in gas-liquid mixtures. found in the catalog.

Flow rate, void fraction and bubble size measurement in gas-liquid mixtures.

Roger Fell

Flow rate, void fraction and bubble size measurement in gas-liquid mixtures.

by Roger Fell

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  • 27 Currently reading

Published in Bradford .
Written in English


Edition Notes

Ph.D. thesis. Typescript.

SeriesTheses
The Physical Object
Pagination119p.
Number of Pages119
ID Numbers
Open LibraryOL13730000M

  A void fraction measurement system for the two-phase flow is developed and experiments are carried out in four different small channels. Four typical flow patterns (including bubble flow, slug flow, stratified flow and annular flow) are investigated. The experimental results show that the development of the measurement system is successful. The. Dan Gysling, chief technology officer at flowmeter manufacturer CiDRA explains, Sonar-based correlation flowmeters use an array of passive pressure sensors clamped to the outside of the pipe to measure the mixture velocity to determine the flow rate and speed of sound through the mixture to determine the gas void fraction. Combining these measurements provides the liquid flow rate and gas-void fraction for two-phase .

Separated Flow Model - Estimation of Frictional Pressure Drop and Void Fraction: PDF unavailable: Separated Flow Model - Estimation of Frictional Pressure Drop and Void Fraction (Contd.) PDF unavailable: Separated Flow Model - Estimation of Frictional Pressure Drop and Void Fraction (Contd.) PDF unavailable: Separated Flow Model. Flow quality, void fraction and slip ratio are generally related as follows: 1 v 1 x 1 S x Figures 1 and 2 show the void fraction vs flow quality for various values of the slip ratio and pressure, respectively, for steam/water mixtures. Figure 1. Effect of S on vs x for water at 7 MPa. Figure 2.

P. Han and U. Wesser, “ Estimating bubble size, bubble velocity, and void fraction of two-phase flow with x-ray scattering,” Gas-Liquid Flows, ASME-FED , 39 (). Google Scholar; S. Javelot, J. Leblond, and C. Baradel, “ Débitmétrie multiphasique par résonance magnétique nucléaire,” La Houille Blanche 7, (). Nonintrusive devices are used to measure spatially averaged flow properties, such as void fraction. Local probes have been developed to measure a variety of pointwise flow quantities, including film thickness in annular flow, local void fraction in dispersed flows, bubble and particle sizes, and flow .


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Flow rate, void fraction and bubble size measurement in gas-liquid mixtures by Roger Fell Download PDF EPUB FB2

1 Void Fraction Measurement of Gas-Liquid Two-Phase Flow from Differential Pressure Jiabin Jiab, Akintayo Babatundea and Mi Wang a* aSchool of Chemical and Process Engineering, University of Leeds, LS2 9JT, UK bSchool of Engineering, University of Edinburgh, Edinburgh, EH9 3JL, UK @, [email protected], @ Size: KB.

(). MEASUREMENT OF THE FLOW RATE AND VOLUME VOID FRACTION OF GAS-LIQUID BUBBLE FLOW USING A VORTEX FLOW METER.

Chemical Engineering Communications: Vol. Measurement Techniques in Multiphase Flow, pp. Cited by: 9. All the void fractions obtained at different combinations of air and water flow rate in Table 1 are plotted in Fig.

5, where differential pressure (DP) model agrees with the guiding principles that void fraction increases with gas superficial velocity and vice versa.

This is because, in the bubble flow regime, the void fraction is less due to Cited by: On the Prediction of Bubble Size Distribution and Void Fraction in Vertical Gas-Liquid Flows G. Yeoh1,2,*, Sherman C. Cheung3, and J. Tu3 1Australian Nuclear Science and Technology Organisation (ANSTO), PMB 1, Menai, NSWAustralia 2School of Mechanical and Manufacturing Engineering, University of New South Wales, SydneyAustralia.

With the extracted information, a new void fraction measurement model was developed and used to determine the void fraction of the two-phase flow.

The proposed method was validated experimentally in horizontal and vertical channels with different inner diameters of, and by: 2. Visualization method for volume void fraction measurements in gas–liquid two-phase flows of a water turbine outlet channel R. Klasinc1, M. Hočevar2, T. Baicar2 & B.

Širok2 1Graz University of Technology, Department for Hydraulic Structures and Water Resources Management, Austria. In this study, the internal phase distributions of gas-liquid bubbly flow in a horizontal pipe have been predicted using the population balance model based on Average Bubble Number Density approach.

Four flow conditions with average gas volume fraction ranging from % to 20% have been investigated. Predicted local radial distributions. Each Phase Occupies a Specific Fraction of the Flow Area “Two-Phase Multiplier” for friction loss: 2 R fm fR PP-LL or in the “Red Book” If flow is choked (critical) use: d,gas If flow is not choked (sub -critical) use: d,liquid K K d K.

Relief Valves for Two-Phase Gas/Liquid Flow”, Chemical Engineering,no. 6, pp 4. Acoustic flow meters based on Doppler effect 5. Turbine flow meters where frequency ~ velocity 6. Optical techniques (Laser Doppler) Single phase flows Two phase flows 1.

Void fraction measurement (A v/A) a) Capacitance measurement b) Optical characterization 2. Quality measurement (m v/m) These techniques are for.

such as void fraction sensors. Recently, gas–liquid flow research by means of a differential pressure device and a void fraction sensor has been reported in [5–7]. Zhang et al. [5] measured air–water mass flow rates with orifice and void fraction meters, Moura and Marvillet [6] measured refrigerant Ra liquid–vapor mass flow.

Void fraction, bubble size and interfacial area measurements in co-current downflow bubble column reactor with microbubble dispersion Article (PDF Available) in Chemical Engineering Science In this paper, a correlation between gas void fraction, absolute acoustic emission energy, and slug velocities in a two-phase air/water flow regime was developed using an acoustic emission technique.

It is demonstrated that the gas void fraction can be determined by measurement of acoustic emission. Bubble flow is characterized by phase distribution phenomena, which exhibit different lateral void fraction profiles, depending on the volumetric flow rate of gas and liquid phases.

Typical lateral void distribution patterns are given in Figure 2, representing wall void peaking, core void peaking and intermediate void peaking. A variety of typical methods, including capacitance sensors [6,7], wire-mesh sensors [8,9], radiation attenuation techniques [10,11], magnetic resonance [12,13] and ultrasonic techniques [14,15] have been applied to measure the gas void fraction of the gas-liquid two-phase sensing principle of the capacitance sensors makes use of different electrical permittivities of the phases.

Flow rate, void fraction and bubble size measurement in gas-liquid mixtures Author: Fell, Roger ISNI: Awarding Body: University of Bradford Current Institution: University of Bradford Date of Award: Availability of Full Text.

Examples of such phenomenological modeling are given in the entries on Plug Flow, Annular Flow, Bubble Flow, Stratified Flow, Slug Flow and Churn Flow. REFERENCES Chexal, B. and Lellouche, G. () Void fraction correlation for generalized applications, Nuclear Safety Analysis Centre of the Electric Power Research Institute, Report NSAC/ @article{osti_, title = {Mass flow rate measurements in gas-liquid flows by means of a venturi or orifice plate coupled to a void fraction sensor}, author = {Oliveira, Jorge Luiz Goes and Passos, Julio Cesar and Verschaeren, Ruud and Geld, Cees van der}, abstractNote = {Two-phase flow measurements were carried out using a resistive void fraction meter coupled to a venturi or orifice.

volumetric flow rate of air by the frequency of bubble formation. The latter and the bubble volume at detachment are measured for three different heights of water above the the tip of the orifice (50,and mm), three orifice diameters (1, 2, and 3 mm), and different gas flow rates between and ml/hr.

Comparing and. Flow regime, void fraction, rise velocity of slug bubbles and frictional pressure loss were measured for air-water flows in capillary tubes with inner diameters in the range from 1 to 4 mm. Void Fraction Measurement and Signal Analysis from Flow parameters such as Taylor bubble velocity and length were obtained by using cross- agas-liquid two-phase mixture in adiabatic upward gas-liquid ßows, as can be seen in the still pictures in Figure 1.

Figure 1a. The objective of the present study was to obtain data on the rate of liquid‐phase controlled mass transfer in two‐phase gas‐liquid flow in horizontal pipes. Studies were made on the effect of the mean gas and liquid flow rate, pipe diameter, and pipe orientation on k 𝓁.

The paper describes an experimental study of the structure of air-water mixtures flowing vertically. Resistivity probe techniques were applied to measurements of local void properties, including void fraction, gas-phase convection velocity, bubble size .Void Fraction. The void fraction, α, is one of the most important parameters used to characterize two-phase fluid flow, especially the gas-liquid flow.

Various geometric definitions are used for specifying this parameter. The void fraction in a two-phase fluid flow may be defined as.