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Showing papers in "International Journal of Multiphase Flow in 1992"



Journal ArticleDOI
TL;DR: In this paper, the properties of drop deformation and secondary breakup were observed for shock wave initiated disturbances in air at normal temperature and pressure Test liquids included water, glycerol solutions, n-heptane, ethyl alcohol and mercury to yield Weber numbers (We) of 05-1000, Ohnesorge numbers (Oh) of 00006-4, liquid/gas density ratios of 580-12,000 and Reynolds numbers (Re) of 300-16,000.

511 citations


Journal ArticleDOI
TL;DR: In this paper, the effects of the wall roughness on the velocity fluctuations of the dispersed phase have been considered in previous studies using irregular bouncing models, which yielded considerably higher values for the particle velocity fluctuations, which also agreed better with the experimental values.

246 citations


Journal ArticleDOI
TL;DR: In this article, the drift-flux approach is adapted to estimate void fraction during upward cocurrent two-phase flow in annuli, and the predictions of the proposed method for flow pattern transition and void fraction are compared with experimental data gathered for this work as well as from independent sources.

190 citations


Journal ArticleDOI
TL;DR: In this paper, an assessment of the various viewpoints on the slug-to-churn flow transition in vertical upward flow in the light of recent experimental results obtained at Harwell Laboratory is made.

173 citations



Journal ArticleDOI
TL;DR: In this paper, the mean slug characteristics (length, holdup and velocity) and their statistical distributions were determined for air/water slug flow in 53 and 90 mm i.d. horizontal pipes.

160 citations


Journal ArticleDOI
TL;DR: In this article, the authors show that no lattice exhibits periodic behavior in uniaxial extensional flow, even though Adler & Brenner have established the existence of compatibility.

144 citations



Journal ArticleDOI
TL;DR: In this paper, a two-phase dispersed air bubble mixing flow within a rectangular vessel is examined using particle image velocimetry (PIV) to obtain non-invasive velocity measurements of the resulting bubble flow field and its induced effects upon a surrounding liquid medium.

135 citations


Journal ArticleDOI
TL;DR: In this paper, the velocity of the fluid is calculated by using a pseudospectral, direct solution of the Navier-Stokes equations and it is assumed that the particle concentration is low enough to allow the use of one-way coupling in the calculations, i.e., the fluid moves the particles but there is no feedback from the particles on the fluid motion.

Journal ArticleDOI
TL;DR: In this article, the stability characteristics of stratified layers of liquid-liquid two-phase systems are considered and the conditions necessary for real characteristics are also explored in view of the implications for flow pattern transitions.

Journal ArticleDOI
TL;DR: In this article, the sound speed and attenuation of a monodisperse suspension of varying solids concentration was modeled exactly for wavelengths much larger than the particle size, including unsteady viscous effects, for the situation where particle interactions are predominantly inviscid.

Journal ArticleDOI
TL;DR: Using holographic interferometry and high-speed cinematography, the heat transfer at the phase interface of vapor bubbles condensing in a subcooled liquid of the same substance was measured with ethanol, propanol, refrigerant R113 and water.

Journal ArticleDOI
TL;DR: In this article, three-phase flow regimes for an air/water/oil system flowing in a horizontal pipe line were observed and flow regime maps were constructed and the superficial velocities, ranging from 15 to 5000 cm/s for air and from 0.4 to 66 cm /s for water, were investigated.

Journal ArticleDOI
TL;DR: In this article, the performance of ring electrodes measuring the conductance of gas mixtures in pipes and packed beds is studied experimentally and theoretically, and a new analytical solution for an annular liquid distribution is presented, which is particularly helpful in assessing the spatial probe sensitivity in the axial direction.

Journal ArticleDOI
L. Zhao1, R.L. Cerro1
TL;DR: In this paper, an experimental program was carried out in order to characterize the mechanics of viscous flows over model complex surfaces, where film thickness profiles, streamline patterns and free-surface velocities were measured for a variety of surface shapes and fluids.

Journal ArticleDOI
TL;DR: In this paper, the authors presented new data for horizontal air/water two-phase flow having various flow regimes and showed that drift-flux models are able to correlate these data and that the drift velocity, V g j, is normally finite.

Journal ArticleDOI
TL;DR: In this article, the dispersion of solid particles in a turbulent shear layer has been investigated experimentally to clarify the dominant factors which govern the particle motion in turbulent gas flow, where spherical glass particles were loaded at the origin of a two-dimensional mixing layer.

Journal ArticleDOI
TL;DR: In this article, a simple set of equations for bubbly flow through a vertical tube is rigorously derived by means of a scale analysis from the realistic equations posed by Pauchon.

Journal ArticleDOI
TL;DR: In this paper, the transition from the homogeneous to the heterogeneous regime in two-dimensional bubble columns is predicted using the theory of linear stability, and a comparison between model predictions and experimental observations has been presented.

Journal ArticleDOI
TL;DR: In this paper, a one-dimensional wave model for incompressible flows predicts the transition between the stratified and slug flow regimes in pipes and validates the method by comparison with a wide range of flow regime data at large pipe diameters, at high gas density and in horizontal or inclined pipes.

Journal ArticleDOI
TL;DR: In this paper, the effects of particle size, density and volumetric concentration on particle mean and r.m.s. velocity were obtained by laser-Doppler velocimetry in solid-liquid turbulent flows in fully baffled stirred reactors driven by Rushton-type impellers at rotational speeds of 150, 300 and 313 rpm.

Journal ArticleDOI
TL;DR: In this article, the structure of vertical upward slug flow in a pipe is studied by simultaneous measurements with two optical fiber probes, and the distribution of the phases in the Taylor bubble zone and the liquid slug zone are investigated by simultaneous measurement with two OFT probes.

Journal ArticleDOI
TL;DR: In this paper, a flush-wire conductance probe is proposed to enhance the spatial resolution for continuous measurement of liquid film thicknesses, and a new calibration technique using the probability of the liquid's existence at several liquid film heights is also proposed.

Journal ArticleDOI
TL;DR: In this paper, moments, probability density functions, spatial correlations and temporal spectra of air velocity fluctuations were measured using two-point phase-discriminating laser velocimetry, and predictions based on a simplified stochastic analysis involving linear superposition of randomly-arriving particle velocity fields were used to help interpret the measurements.

Journal ArticleDOI
TL;DR: In this paper, a new, necessary but not sufficient criterion for the transition to stable slug flow has been derived from an initial condition of slug growth, which reflects the well-known fact that waves of all kinds may form, even leading to liquid bridging of the pipe, but that the resulting slugs decay over a wide range of flow rates.

Journal ArticleDOI
TL;DR: In this paper, the stability of the solutions for stratified flow is considered using two types of stability analyses: (1) structural stability analysis; and (2) interfacial stability analysis (Kelvin-Helmholtz, K-H).

Journal ArticleDOI
TL;DR: In this paper, a phase-Doppler anemometer was used to measure the velocity of the entrained air and 60 and 30 μm droplets, together with the associated fluxes, from a 5-hole diesel spray exhausting into atmosphere at a repetition rate of 10 Hz.

Journal ArticleDOI
TL;DR: In this article, a systematic experimental study of the interaction of drops with solid particles of different sizes moving with moderate and high relative velocities has been carried out, and numerical studies of three-phase polydisperse flow characteristic properties have been performed.