TITLE

Comparison of four conductive needle probe designs for determination of bubble velocity and local gas holdup

AUTHOR(S)
Munholand, Luke; Soucy, Gervais
PUB. DATE
September 2005
SOURCE
Review of Scientific Instruments;Sep2005, Vol. 76 Issue 9, p095101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Four conductive needle probe designs were compared in order to determine which probe was most effective at measuring local gas fraction holdup and bubble velocity. Test conditions were identical for all probes with global gas fraction holdup [variant_greek_epsilon]g=0.018±0.002 Lgas/Ltotal and mean bubble velocities at 0.296±0.141 m/s. Video was used to validate the probe measurements. Fluid mechanics theory suggests the smallest probe should give the most accurate results. However, in tests the smallest probe performed poorly due to a low signal-to-noise ratio (SNR). The largest probe gave the best results due to its excellent SNR and appropriately spaced sensors.
ACCESSION #
18415552

 

Related Articles

  • Design of a high precision falling-ball viscometer. Brizard, M.; Megharfi, M.; Mahé, E.; Verdier, C. // Review of Scientific Instruments;Feb2005, Vol. 76 Issue 2, p025109 

    The increase in uncertainty throughout the viscosity scale being the principal disadvantage of capillary viscometry, an absolute falling-ball viscometer has been developed, making it possible to cover a wide range of viscosities while keeping a weak uncertainty. The measurement of viscosity of a...

  • Visualization of flow patterning in high-speed centrifugal microfluidics. Grumann, Markus; Brenner, Thilo; Beer, Christian; Zengerle, Roland; Ducrée, Jens // Review of Scientific Instruments;Feb2005, Vol. 76 Issue 2, p025101 

    This work presents a new experimental setup for image capturing of centrifugally driven flows in disk-based microchannels rotating at high frequencies of up to 150 Hz. To still achieve a micron-scale resolution, smearing effects are minimized by a microscope-mounted CCD camera featuring an...

  • A fluid handling system with finger-tightened connectors for biological studies at kiloatmosphere pressures. Urayama, Paul; Frey, Eric W.; Eldridge, Michael J. // Review of Scientific Instruments;Apr2008, Vol. 79 Issue 4, p046103 

    We present a high-pressure fluid handling system based around a simple-to-construct seal for applications in the biologically relevant kiloatmosphere range. Connectors are compact and finger tightened, as compared to the wrench tightening required of cone-type seals commonly used. The seal...

  • Experimental apparatus for studying rotating magnetic field current drive in plasmas. Giersch, Louis; Andreason, Samuel; Slough, John T. // Review of Scientific Instruments;Sep2005, Vol. 76 Issue 9, p093507 

    This article describes the design and operation of an experimental apparatus that was constructed for studying rotating magnetic field (RMF) current drive in plasmas formed in a metal vacuum chamber. The device was designed to enable the study of various RMF coil geometries that are fully...

  • Measurement of thermal properties of gases using an open photoacoustic cell as a sensor. Bonno, B.; Laporte, J. L.; D'Leon, R. Tascon // Review of Scientific Instruments;Sep2005, Vol. 76 Issue 9, p096104 

    An alternative photothermal technique for the measurement of thermal properties of gases is described. The proposed technique uses the open photoacoustic cell as a sensor. The gas sample is confined between two thin aluminum foils. One of these acts as the absorber of modulated light while the...

  • Measurement of absolute electron density with a plasma impedance probe. Blackwell, David D.; Walker, David N.; Amatucci, William E. // Review of Scientific Instruments;Feb2005, Vol. 76 Issue 2, p023503 

    A small spherical probe is used in conjunction with a network analyzer to determine the impedance of the probe-plasma system over a wide frequency range. Impedance curves are in good agreement with accepted circuit models with plasma-sheath and electron plasma frequency resonances easily...

  • Synthesis of aluminum nitride films by plasma immersion ion implantation–deposition using hybrid gas–metal cathodic arc gun. Liru Shen, R.J.; Fu, Ricky K.Y.; Chu, Paul K. // Review of Scientific Instruments;Mar2004, Vol. 75 Issue 3, p719 

    Aluminum nitride (AlN) is of interest in the industry because of its excellent electronic, optical, acoustic, thermal, and mechanical properties. In this work, aluminum nitride films are deposited on silicon wafers (100) by metal plasma immersion ion implantation and deposition (PIIID) using a...

  • Instrument reflections and scene amplitude modulation in a polychromatic microwave quadrature interferometer. Dobson, Chris C.; Jones, Jonathan E.; Chavers, D. Gregory // Review of Scientific Instruments;Mar2004, Vol. 75 Issue 3, p674 

    A polychromatic microwave quadrature interferometer has been characterized using several laboratory plasmas. Reflections between the transmitter and the receiver have been observed, and the effects of including reflection terms in the data reduction equation have been examined. An error analysis...

  • Ion temperature and plasma rotation profile effects in the neutron emission spectrum. Tardocchi, M.; Gorini, G.; Henriksson, H.; Källne, J. // Review of Scientific Instruments;Mar2004, Vol. 75 Issue 3, p661 

    The instrumental factors and measuring conditions affecting neutron emission spectrometry measurements of tokamak plasmas are described and analyzed. The measured energy broadening and shift of the neutron emission is used to deduce ion temperature (T[sub i]) and toroidal plasma rotation...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics