Showing papers in "International Journal of Multiphase Flow in 2004"

TL;DR: In this paper, the effect of channel diameter on two-phase flow was investigated to identify the phenomena which distinguish microchannels from minichannels, and a new slug flow model was also proposed to gain physical insight into the observed flow characteristics in micro-channels.

TL;DR: In this article, the coalescence process of two gold nanoparticles for a host of initial temperatures and starting radii in vacuum with the help of molecular dynamics simulations was investigated, and a phenomenological macroscopic model based on an energy balance and supplemented by a model for the surface variation of the nanosystem under consideration.

TL;DR: In this article, the dual continuous flow pattern (both phases retain their continuity at the top and bottom of the pipe while there is interdispersion), which occurs during the pipe flow of two immiscible liquid phases, was studied in detail, and pressure gradient, in situ volume fraction and phase distribution data were obtained.

TL;DR: In this paper, nonequilibrium molecular dynamics simulations of the flow of liquid-vapour water mixtures and mixtures of water and nitrogen inside carbon nanotubes are presented.

TL;DR: In this paper, surface divergence models for prediction of scalar exchange at fluid-fluid interfaces are investigated, based on the Hunt-Graham blocking theory, and new results of direct numerical simulation for deformable, non-breaking sheared interfaces are obtained.

TL;DR: In this paper, a particle-level, dynamic simulation technique was developed to probe the structural behavior of non-Brownian fiber suspensions in simple shear flow, incorporating a variety of realistic features including fiber flexibility, irregular equilibrium fiber shapes, and fiber interactions.

TL;DR: In this paper, the authors extended the Yih model for interfacial instabilities in two-fluid channel flow and showed that when the critical layer of the dominant disturbance overlaps the viscosity-stratified layer, the instability is broadband and at low Reynolds number.

TL;DR: In this paper, the evaporation process from a liquid meniscus formed in capillary tubes of various sizes is investigated; a very strong convection within the liquid phase is observed.

TL;DR: In this paper, the dynamics of the break-up of spiralling jets of Newtonian liquids were visualised using a high-speed camera, and the effects of liquid dynamic viscosity, rotation rate and orifice size on the breakup and drop size distributions were investigated.

TL;DR: In this article, an Eulerian model of a turbulent fibre suspension flowing through a planar contraction is proposed to predict the fibre orientation distribution, specifically applying to the flow of pulp suspensions through a papermachine headbox.

TL;DR: In this article, a vertical rectangular channel with three liquids characterized by high Kapitza numbers, water, butanol and 2.5% butanol solutions with surface tension 75, 50 and 40 mN/m, respectively, at intermediate Reynolds numbers (ReL < 400).

TL;DR: In this article, an adiabatic, air-water, co-current, vertically downward bubbly flow was studied to gain a better understanding of interfacial structures and flow characteristics.

TL;DR: In this article, a map for the determination of flow pattern for two-phase flow of gas and non-Newtonian liquid in the vertical pipe has been presented, and experimental data confirm applicability of such a map.

TL;DR: In this paper, the shape of the vapor-liquid interface is detected and the dry angle and void fraction are accurately determinable over a wide range of conditions for a glass tube of 136 mm diameter.

TL;DR: In this article, an analysis of the stability of a liquid jet into a gas or another liquid using viscous potential flow is carried out, where the instability may be driven by Kelvin-Helmholtz (KH) instability due to a velocity difference and a neckdown due to capillary instability.

TL;DR: In this paper, the preferential concentration of dense particles in a downward, fully developed turbulent square duct flow at Reτ=360, based on mean friction velocity and duct width, was studied using large eddy simulations.

TL;DR: This paper presents an explicit characteristics-based, conservative, finite-difference method for the simulation of incompressible multiphase flows that is based on the artificial compressib ...

TL;DR: In this paper, a detailed study of the reflection process from a wedge placed in various suspensions is presented, where the suspension behind the incident shock wave has reached steady state (i.e., it is a traveling wave) before the shock reaches the wedge leading edge.

TL;DR: In this paper, a model that attributes the aeration of the liquid slug to a recurrent bubble entrainment from the Taylor bubble (TB) tail is introduced, which is related to the rate of turbulent kinetic energy produced in the wall jet and shear layer.

TL;DR: In this article, a new optical void fraction measurement system has been coupled to a flow boiling test facility to obtain dynamic and time-averaged void fractions in a horizontal tube, and a series of evaporation tests have been run for two refrigerants.

TL;DR: In this article, a phase detection optical probe has been used to measure the drop velocities and chords in dense sprays with a wide distribution of diameters in the near field.

TL;DR: In this article, the authors proposed a two-fluid model for the wall and interfacial shear stresses for stratified laminar pipe flows, where the single-phase-based expressions are augmented by the two-phase interaction factors.

TL;DR: In this article, the fraction of liquid entrained in the gas phase at T-junctions has been determined at liquid flow rates much higher than hitherto, and the results and other available data are examined to question whether the entrained liquid is being carried as drops or travelling in huge waves which have been identified as being present at the flow rates corresponding to churn flow.

TL;DR: In this article, a simple and practical correlation for the Sauter mean diameter was developed, taking the form SMD ( μm )=118.4−28.3( Δ T ∗ −K) where ΔT ∗ and K are a dimensionless degree of superheating and the cavitation number, respectively.

TL;DR: In this article, a front-tracking/finite difference method was used to simulate Poiseuille flow instability at the interface of a two-layer, density-matched, viscosity-stratified Poiseueille flow, and the authors presented results for the small-amplitude (linear) growth rate of the instability at small to medium Reynolds number for varying thickness ratio n, viscous layer m, and wavenumber.

TL;DR: In this paper, the void fraction of R134a vapor-liquid two-phase flow in horizontal smooth and microfin tubes in adiabatic condition is measured by the quick closing valve method.