Results 151 to 160 of about 208,593 (196)

Void fraction dynamics in fluidization

AIP Conference Proceedings, 1992
A nonlinear evolution equation for void fraction in fluidization is derived from a one‐dimensional continuous model by applying the method of adiabatic eliminations. Based on our equation, the dynamics near the transitions point from stable fluidized beds to unstable ones is investigated. Phase separations in fluidized beds are also discussed.
Shin-ichi Sasa, Hisao Hayakawa
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Experiments on void fraction waves

International Journal of Multiphase Flow, 1989
Abstract Experiments on the propagation of small void fraction disturbances along an upward vertical test section are reported, for bubbly flows and transitional (bubbly-slug) flows. Wave attenuation and propagation speeds are discussed. In particular, it is shown that two propagation phenomena, with different speeds, may coexist, the higher speed ...
J.M. Saiz-Jabardo, J.A. Bouré
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Void fraction prevision in LCM parts

The European Physical Journal Applied Physics, 2001
The formation of defects during the LCM processing of composite parts depends on various injection parameters. Industrial users need to realize pieces with good physical and mechanical properties and appearance. This requires to predict what is named a “processability window”.
L. Labat, J. Bréard, S. Pillut-Lesavre, G. Bouquet   +3 more
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Void fraction measurements in breaking waves

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2007
This paper describes detailed measurements and analysis of the time-varying distribution of void fractions in three different breaking waves under laboratory conditions. The measurements were made with highly sensitive optical fibre phase detection probes and document the rapid spatial and temporal evolutions of both the bubble plume generated beneath ...
Blenkinsopp, C.E., Chaplin, J.R.
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Void Fractions in Subcooled Flow Boiling

Journal of Heat Transfer, 1969
A semianalytic model is presented for the prediction of void fractions in subcooled flow boiling at elevated pressures. The model is based on the formation and growth of a bubble boundary layer adjacent to the heated surface at a rate determined by the difference between the imposed surface heat transfer and the heat removal capability of the subcooled
P. S. Larsen, L. S. Tong
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Void fraction measurement in magnetic fluid

Journal of Magnetism and Magnetic Materials, 2005
Abstract A new technique of measuring void fraction in the magnetic fluid using the electromagnetic induction is introduced. In order to verify the measurement principle, proof experiments were conducted in the present study, and the accuracy of the proposed method was discussed.
Takuya Kuwahara, Hiroshi Yamaguchi
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Void-fraction reconstruction with stochastic data

Experiments in Fluids, 1994
The technique of computerized tomography has been used earlier to measure point density (or void-fraction) distribution in air-water flows. The interrogation source used in the measurement system was a gamma ray source, Cs-137. The inherent nature of such sources is the Poisson nature of the emmitted radiation.
P. Munshi, M. S. Vaidya
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Void fraction measurement using impedance method

Flow Measurement and Instrumentation, 2003
Abstract To investigate the relationship between void fraction and volume-averaged impedance in water–air mixtures, a Styrofoam simulator was designed and manufactured. Because the relative permittivity of Styrofoam is negligible compared to that of water, Styrofoam spheres immersed in water act like air bubbles.
Yang, HC, Kim, DK, Kim, MH
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Void Fraction—Empirical Methods

2017
The chapter begins by describing the principles of the various methods available for measuring the void fraction ; these include photographic techniques optical or electrical techniques that produce point measurements of the void fraction , etc. One can obtain point measurements, chordal averages, cross-sectional averages or volume averages in the two ...
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Void fractions in two‐phase flow

AIChE Journal, 1959
AbstractVoid fractions (fraction of the flow cross‐sectional area occupied by the gas phase) have been measured for steam‐water flows in an adiabatic, horizontal test section of 0.484 in. I.D. at 400, 600, 800, and 1,000 1b./sq. in. gauge. A comprehensive survey of void data for two‐phase concurrent flow is included in the paper, and the data ...
H. S. Isbin, H. A. Rodriguez, H. C. Larson, B. D. Pattie   +3 more
openaire   +1 more source