Investigation of the gas-liquid-particle multi-phase hydrodynamics of Wemco flotation cells

Design and Testing of Instrumentation for Multi-Phase Flow Sampling and Local Void Fraction Measurement

ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 2, Fora ◽

10.1115/ajk2011-31004 ◽

2011 ◽

Author(s):

Yihong Yang ◽

Demetri P. Telionis

Keyword(s):

Void Fraction ◽

Bubbly Flow ◽

Calibration Procedure ◽

Phase Flow ◽

Flotation Cells ◽

Three Phase Flow ◽

Extensive Test ◽

Multi Phase Flow ◽

Multi Phase ◽

Fraction Measurement

Instrumentation is available to obtain samples and then measure the local void fraction as well as the size and number density of bubbles and/or particles in two and three-phase flow. But in most cases, these methods interfere with the flow and bias the sampling process. We have developed an isokinetic probe that can take accurate samples without changing the sample’s composites. This is achieved by aligning the probe’s intake nozzle with the flow’s local predominant direction and matching its internal pressure with its hydrodynamic environment and hence equalizing the inside and outside velocities. Then the fluid sample’s density is measured to calculate the local void fraction. The calibration procedure and results as well as extensive test data obtained in bubbly-flow tunnel and flotation cells respectively are presented and discussed.

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Some Applications of the U. S. Steel MVEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100070461 ◽

1973 ◽

Vol 31 ◽

pp. 4-5

Author(s):

J. S. Lally ◽

L. E. Thomas ◽

R. M. Fisher

Keyword(s):

Electron Diffraction ◽

Debye Temperature ◽

Metals And Alloys ◽

Critical Voltage ◽

Dynamical Diffraction ◽

Phase Structures ◽

Structure Factors ◽

Local Bonding ◽

Diffraction Phenomenon ◽

Multi Phase

A variety of materials containing many different microstructures have been examined with the USS MVEM. Three topics have been selected to illustrate some of the more recent studies of diffraction phenomena and defect, grain and multi-phase structures of metals and minerals.(1) Critical Voltage Effects in Metals and Alloys - This many-beam dynamical diffraction phenomenon, in which some Bragg resonances vanish at certain accelerating voltages, Vc, depends sensitively on the spacing of diffracting planes, Debye temperature θD and structure factors. Vc values can be measured to ± 0.5% in the HVEM ana used to obtain improved extinction distances and θD values appropriate to electron diffraction, as well as to probe local bonding effects and composition variations in alloys.

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Digital imaging and quantitative image analysis of polymer blends

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100163319 ◽

1996 ◽

Vol 54 ◽

pp. 170-171

Author(s):

Xiao Zhang

Keyword(s):

Digital Imaging ◽

Imaging Techniques ◽

Imaging Systems ◽

Polymer Science ◽

Key Factors ◽

Multiple Imaging ◽

Quantitative Image ◽

Digital Imaging Systems ◽

Multi Phase ◽

Network Technologies

Polymer microscopy involves multiple imaging techniques. Speed, simplicity, and productivity are key factors in running an industrial polymer microscopy lab. In polymer science, the morphology of a multi-phase blend is often the link between process and properties. The extent to which the researcher can quantify the morphology determines the strength of the link. To aid the polymer microscopist in these tasks, digital imaging systems are becoming more prevalent. Advances in computers, digital imaging hardware and software, and network technologies have made it possible to implement digital imaging systems in industrial microscopy labs.

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