Showing papers in "International Journal of Multiphase Flow in 1979"

TL;DR: In this article, extensive new data have been obtained on the transitions between two-phase flow patterns during co-current gas liquid flow in horizontal lines, where fluid properties were varied in a systematic manner to determine the effects of liquid viscosity, liquid density, interfacial tension and gas density.

TL;DR: In this article, the so-called virtual mass force during the acceleration of a two-phase mixture was studied and it was shown that this interfacial force must be objective and invariant under a change of reference frame.

TL;DR: In this paper, the process of determining appropriate constitutive equations for multidimensional time averaged two-phase flow equations is studied from the point of view of starting from general principles, and proceeding to specific constitutive equation which contain known physical effects.

TL;DR: In this article, a spatial averaging of the equations describing two single-phase media is separately considered regarding the volumes occupied by either phase with allowance for the boundary conditions on phase interfaces.

TL;DR: In this paper, the authors investigated the effect of tube end geometries on measured countercurrent fluxes, liquid fraction, and pressure gradients, and analogies between countercurrent gas-liquid flow and other more familiar flows in internal geometry are indicated.

TL;DR: For an adiabatic, constant flowrate and frictionless flow of a supersaturated liquid, the equations of evolution are established owing to a variable which is a flashing index as discussed by the authors.

TL;DR: In this paper, the mass flux scaling factor for modeling water with Freon-12 in horizontal flow is generally higher than that for vertical flow, and it shows a greater sensitivity to pressure.

TL;DR: The sliding bed theory of deposition has been compared with a range of experimental results most of them not previously published as discussed by the authors, and the results for higher viscosity fluids do not show such good agreement.

TL;DR: The phase structure of vertical air-water mixture flows through venturis was investigated using area contraction ratios of 3.16 and 7.11 and with variations in angles of convergence and divergence.

TL;DR: In this article, an experimental study has been made of the rate at which steam condenses on a pool of turbulent water, under conditions where diffusion of heat in the liquid phase is the controlling factor.

TL;DR: In this article, Taitel and Dukler (1976) extended their model for gas/Newtonian liquid flow to liquids possessing either shear-thinning or shearthickening laminar flow behaviour and computed results are given for flow behaviour indices in the range 0.1 ≤ n ≤ 2.

TL;DR: Capillary hydrodynamic chromatography as discussed by the authors is a widely used technique for separating ultrafine liquid particles through a capillary tube, where the passageway is not a packed column, but a completely open, cylindrical tube, and particle transit time is a function of the diameter of the particle.

TL;DR: In this article, an upper bound on the required phase velocity difference and the wave height for conditions just subcritical to those needed for slugging was derived for air/water flow at atmospheric pressure in ducts of rectangular crosssection.

TL;DR: In this paper, a method for calculating the length over which the swirl persists is given, where the swirl is assumed to deposit all the entrained drops onto the liquid film and to persist for a certain distance after the swirl device, good comparisons with experiment are obtained.

TL;DR: In this paper, a method of characteristics algorithm for the equal velocity, unequal temperature model of one-dimensional two-phase flow has been implemented, which uses a mesh of characteristics dz/dt = u ± a.

TL;DR: In this paper, the development of the dust mass concentration profiles is measured by means of an optical extinction method, which can be described by an exponential law approach a stationary limit consistent with the results of pneumatic transport theory.

TL;DR: In this paper, the flows produced by a rotlet and a sphere rotating perpendicular to an interface separating two immiscible fluids are studied, and exact solutions are constructed in terms of the stream function and velocity.

TL;DR: In this paper, the effect of a layer of an adsorbed surfactant monomolecular film of fluid which covers the surface of a large volume of a different substrate fluid is considered with respect to the fluid motion caused by the slow rotation of a submerged sphere.

TL;DR: In this article, the authors investigated the flow of a foam in a convergent-divergent nozzle and showed that the results were in very good agreement with a homogeneous frictionless nozzle flow theory, assuming isothermal behaviour of the gas and no relative motion between the phases.

TL;DR: In this paper, an exact numerical solution for the velocity profiles and the form of a laminar jet in immiscible Newtonian liquid systems is obtained by using an indivisible finite-difference scheme.

TL;DR: In this article, the influence of test section orientation and diameter on flow boiling crisis occurring in tubes has been studied experimentally using Freon-12 as a coolant, and the results showed that the effect of tube diameter on boiling crisis in general depends crucially on the parameters which are maintained constant when the comparison is made.

TL;DR: In this article, a formulation in terms of a Fredholm integral equation of the first kind is given for the axisymmetric problem of a solid rotating in a bounded viscous fluid whose surface is contaminated with an immiscible surfactant film.

TL;DR: In this paper, a method is developed giving the necessary conditions for the presence of slug flow in two-phase horizontal two-dimensional liquid-liquid systems, which is characterized by periodic large waves "surging" along the tube.