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1 edition of Electrostatic induction in two-phase gas-solid flow measurements found in the catalog.

Electrostatic induction in two-phase gas-solid flow measurements

Juliusz B. Gajewski

Electrostatic induction in two-phase gas-solid flow measurements

50 years of a measurement method

by Juliusz B. Gajewski

  • 230 Want to read
  • 6 Currently reading

Published by Oficyna Wydawnicza Politechniki Wroclawskiej in Wroclaw .
Written in English

    Subjects:
  • Electromagnetic induction

  • Edition Notes

    Includes bibliographical references.

    StatementJuliusz Bohdan Gajewski
    Classifications
    LC ClassificationsQC631 .G35 2010
    The Physical Object
    Pagination149 p. :
    Number of Pages149
    ID Numbers
    Open LibraryOL25301127M
    ISBN 109788374935371
    LC Control Number2012381019
    OCLC/WorldCa745449993

    Electromagnetic or magnetic induction is the production of an electromotive force (i.e., voltage) across an electrical conductor in a changing magnetic field.. Michael Faraday is generally credited with the discovery of induction in , and James Clerk Maxwell mathematically described it as Faraday's law of induction. Lenz's law describes the direction of the induced field. A two-phase microfluidic system that requires two immiscible fluid phases inside a microfluidic channel has been rapidly developed in various science and engineering fields because of its own benefits, such as decreased sample/reagent consumption, reduced diffusion times, enhanced throughput, and fast response time 1,2,3,4, particular, gas–aqueous liquid two–phase flow plays an.

      Electrostatic Induction: * Electrostatic Induction is the accumulation or redistribution of electric charges in a body due to nearby charged body without any physical contact. * It workes for short distances. * It is due to static charges. * Elec. How is it with the electrostatic induction measurement? Everywhere you can read about the effect of electrostatic induction but I still can't found any detailed explanations or quantitative measurements. Perhaps someone here might help me. Here is a Picture about the .

    In cgs electrostatic system, the unit of charge is called as STATECOULUMB or esu of charge. • In this system electrostatic constant c=1 for vacuum or air, One stat coulomb is defined that amount of charge which when placed at a distance of 1 cm in air from an equal and similar charge repel it . The flow meter’s accuracy itself can be determined as either an instantaneous flow measurement or an accumulative flow measurement. The flow meter standard uses the accumulative flow technique—measuring the average flow of a volume of water over a long period of time, say for 30 or 60 seconds. This, rather than the instantaneous flow.


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Electrostatic induction in two-phase gas-solid flow measurements by Juliusz B. Gajewski Download PDF EPUB FB2

1. Introduction. The calibration system presented here enables both the calibration and verification or test of the electrostatic (inductive), non-contact probes, sensors, or transducers, or measuring systems intended for the continuous, real-time, indirect, non-intrusive measurement of the mass flow rate or concentration (volume loading) as well as the electric charge of solid particles that Cited by: The author decided to disseminate the information contained in this paper among a wider group of readers for their benefit though its part is the material presented in the monograph “Electrostatic induction in two-phase gas–solid flow measurements.

50 years of a measurement method” [1]). Certain fragments both in the monograph and in the Cited by: For velocity measurements of solid-phase particles in gas-solid two-phase flow, the cross-correlation and adaptive filtering time delay estimation for measuring the velocity are discussed.

Electrostatic sensor is based on the principle of electrostatic induction. It is widely used for gas/solid two-phase flow measurement because it has the advantages of simple structure, high sensitivity, low cost, etc. In this paper, a velocity measurement system of gas/solid flow based on electrostatic sensor and cross-correlation algorithm is : Yu Tang, Xiang Deng, Shuo Tian.

Cross-correlation focus method with an electrostatic sensor array for local particle velocity measurement in dilute gas–solid two-phase flow Article in Measurement.

J.B. GajewskiNon-contact electrostatic flow probes for measuring the flow rate and charge in the two-phase gas–solids flows Chem. Eng. Sci., 61 (), pp. Google Scholar. The main problem lies in proper defining and establishing the unambiguous relationships between the electric parameters of a measuring system, which uses a probe, sensor or transducer based on electrostatic induction.

Such devices are non-contact, non-obstructive ones and are intended for the two-phase flow metering of charged solids in pipelines. Electrostatic Nonintrusive Method for Measuring the Electric Charge, Mass Flow Rate, and Velocity of Particulates in the Two-Phase Gas–Solid Pipe Flows—Its Only or as Many as 50 Years of.

Wang C, Zhang J, Gao W, Ding H and Wu W Cross-correlation focus method with an electrostatic sensor array for local particle velocity measurement in dilute gas–solid two-phase flow Meas.

Sci. Technol. 26 The gas-solid two-phase flow has been widely applied in the power, chemical and metallurgical industries. It is of great significance in the research of gas-solid two-phase flow to measure particle velocity at different locations in the pipeline.

Thus, an electrostatic sensor array comprising eight arc-shaped electrodes was designed. The relationship between the cross-correlation (CC) velocity.

Electrostatic induction, modification in the distribution of electric charge on one material under the influence of nearby objects that have electric charge. Thus, because of the electric force between charged particles that constitute materials, a negatively charged object brought near an electrically neutral object induces a positive charge on the near side and a negative charge on the far.

Abstract: Electrostatic sensor is based on the principle of electrostatic induction. It is widely used for gas/solid two-phase flow measurement because it has the advantages of simple structure, high sensitivity, low cost, etc.

The electrostatic induction calculation by MATLAB shows that when the diameter ratio d / D is and the velocity is m/s, the electrostatic induced charge of dust particles is the largest at this time. Xu Chuanlong Study on the method of measuring particle charge and flow parameters of gas-solid two-phase flow [D] (Southeast.

The gas–solid two-phase flow has been widely applied in the power, chemical and metallurgical industries. It is of great significance in the research of gas–solid two-phase flow to measure particle velocity at different locations in the pipeline.

Thus, an electrostatic sensor array comprising eight arc-shaped electrodes was designed. Electrostatic induction, also known as "electrostatic influence" or simply "influence" in Europe and Latin America, is a redistribution of electric charge in an object, caused by the influence of nearby charges.

In the presence of a charged body, an insulated conductor develops a positive charge on one end and a negative charge on the other end. The electrostatic sensor, which is based on the particle charging of gas–solid two-phase flows, has the advantages of a simple structure, and being a non-contact, highly sensitive, low-cost and safe sensor that is suitable for the harsh industrial environment.

Nature of gas–solid fluidization When applying a measuring instrument to a laboratory or industrial gas–solid fluidized bed, the validity and accuracy of the measurement strongly depend on the intrinsic complexity of the flow system, such as the heterogeneous phase distribu-tion, flow-regime variation, velocity and acceleration of gas.

electrostatic discharge charge measurement electric charge electrostatic devices solid loading electrostatic nonintrusive method electric charge measurement mass flow rate two-phase gas-solid pipe flows electrostatic induction electrostatic flow probe flow velocity Probes Charge measurement Atmospheric measurements Electrodes Particle.

Due to the simple structure and high sensitivity, the electrostatic method is widely used in the measurement of the gas–solid two-phase flow. The ring-shape electrodes with different widths have. Gajewski, J.B.: Non-Contact Electrostatic Flow Probes for Measuring the Flow Rate and Charge in the Two-Phase Gas–Solid Flows.

Chemical Engineering Scie – () CrossRef Google Scholar. such as oil, gases and two-phase gas-solid flow. A linear relationship between the mean fluid velocityv in a pipe flow and the mean frequency Z in the spectrum of the noise signal caused by the passage of electrostatic charges carried by the flow has been established in [19] and [20] whereZ is defined by the relationship ³ ³ f f 0 0 ZZW(Z.The velocity of solid particles in gas-solid two-phase flow is an important parameter, which can reflect the flow condition of gas-solid two-phase flow.

However, it is difficult to be measured. The electrostatic sensor combined with correlation technique provides a proper solution to the velocity measurement of gas-solid two-phase flow.Great advances have been made in particle velocity measurement in gas-solid flow by using electrostatic sensors along with signal processing algorithms such as cross-correlation [10,11,12,13,14] and spatial filtering [15,16,17] techniques, and encouraging results have been obtained in both laboratory and field experiments.