Showing papers in "International Journal of Multiphase Flow in 1985"

TL;DR: In this paper, the flow patterns which occur in upward gas-liquid two-phase flow in vertical tubes are described and the use of flow pattern maps is discussed, and the transition between plug flow and churn flow is modelled under the assumption that flooding of the falling liquid film limits the stability of plug flow.

TL;DR: A physical model for predicting gas holdup in liquid slugs in horizontal and vertical two phase pipe slug flow is presented in this paper, which can also be used to yield the transition between elonganted bubbles and slug flow within the intermittent flow pattern.

TL;DR: In this article, an analytical formula for the bubble rise velocity in stagnant liquid is proposed, and shown to be in good agreement with experimental data for all values of surface tension, where the effects of liquid motion and surface tension are incorporated through the Reynolds and inverse Eotwos.

TL;DR: In this paper, the authors measured the velocity of the interface between conducting and nonconducting phases, which equals the gas velocity only for low void fractions, by using resistivity probes.

TL;DR: In this paper, the dynamics of two spherical droplets, whose movement is driven by variations in interfacial tension caused by a temperature gradient, are analyzed using a method of reflections, and the results for two-droplet interactions are correct to 0(r −6 ) where r is the center-to-center distance between the droplets.

TL;DR: In this paper, the wall temperature profile and photographic observation were performed for R-113 subcooled boiling flow in a channel with heat fluxes up to the CHF, and the bubble density on the heated surface increases and remarkably large coalescent bubbles appear periodically near the heating section outlet.

TL;DR: In this paper, the authors derived a nonlinear structure equation for long waves on the surface of vertical falling liquid films, which is valid in a wide range of Reynolds numbers and reduces to the known equations for high and low Re.

TL;DR: In this paper, the authors present an analysis that predicts wall-skewed bubble distribution by incorporating into the equation of motion a lateral force due to the relative velocity of the two phases and the eddy diffusivity of the liquid.

TL;DR: In this article, the stability features of a general elass of one-dimensional two-phase flow models are examined, and it is shown that, despite the presence of algebraic terms in the equations (describing, e.g., drag effects) the stability criteria are independent of the wavenumber of the perturbation.

TL;DR: In this article, the authors describe a series of experiments to observe and photograph the flooding process and show that flooding occurs as a result of the formation and motion of a large disturbance wave on the surface of the liquid film.

TL;DR: In this paper, the authors measured local condensation heat transfer coefficients and interfacial shear stresses for countercurrent stratified flow of steam and subcooled water in rectangular channels over a wide range of inclination angles (4 −87°) at two aspect ratios.

TL;DR: In this article, void fraction measurements and observations of flow pattern transitions during flow transients have been made during steady-state, co-current, downward flow of liquid refrigerant 113 and its vapor.

TL;DR: In this paper, different empirical equations for the flow regime transitions are proposed that are functions of inclination angle for both upflow and downflow, and a detailed comparison of the proposed transition equations with a number of flow regime maps is also presented.

TL;DR: In this article, a rigorous analysis of the almost time-periodic low Reynolds number hydrodynamics of a spatially periodic suspension of identical convex particles in a Newtonian liquid undergoing a macroscopically homogeneous linear shear flow is presented.

TL;DR: In this paper, a two-equation turbulence model for steady incompressible two-phase flows including phase change has been developed for the flow of a turbulent axisymmetric gaseous jet laden with evaporating liquid droplets.

TL;DR: In this paper, a theoretical analysis is developed to examine the radial stress distribution within a uniformly thin liquid film flowing around a sharp bend of fixed radius, and the results of the analysis are discussed in the light of experimental observations.

TL;DR: In this article, the authors compared measurements of bubble velocities, dimensions and flow rates in a two-dimensional fluidized bed by a dual electrical capacitive probe with measurements from cine photography, and found that both sets of measurements were in agreement only when the conditions of electrical measurement were arranged to exclude spurious signals, while still retaining sensitivity.

TL;DR: In this article, the equivalent thermal resistance and permeability of a Leibniz packing with small gap between the disks are calculated in the lubrication approximation, which is related to the scale invariance of resistances of the gaps, and is used to derive the exponent of the power law with an excellent precision.

TL;DR: In this paper, the advantages of new forms of Faxen laws with derivatives of finite order are discussed and specifically illustrated for prolate spheroids for the case of singularity solutions of the Stokes flow.

TL;DR: In this article, the authors analyzed two-phase flow in horizontal pipe with simplified models for annular and stratified flow, and the velocity profiles for the liquid and gas phase were described with the Prandtl mixing length.

TL;DR: In this paper, a purely kinematical study of the motion of a mobile spatially periodic array of identical convex particles participating in a macroscopically homogeneous linear shear flow to which the suspension as a whole is subjected is presented.

TL;DR: In this paper, Taylor dispersion is studied on a tree and on a Sierpinski gusket, and the influence of the finite character of the network is clearly pointed out.

TL;DR: In this paper, a general fractal capillary network is constructed and described via a systematic use of algebraic graph theory, and the Stokes flow problem is addressed in this contribution; the matrix relating the fiow rates to the pressures is obtained through a general iteration formula, which is deduced from the algebraic description of the geometrical structure.

TL;DR: In this paper, the authors derived a semitheoretical correlation for the heat transfer coefficients in the bubble column, which was derived from Higbie's surface renewal theory of interphase mass transfer with the concept of isotropic turbulence.

TL;DR: In the case of small values of Re 4 / Gr, strong waves beneath the downward-facing wall were observed and graphically evaluated in order to find a basis for further theoretical approach.

TL;DR: In this article, the authors examined the effect of the Coriolis force on the settling of a mixture of particles and fluid in an axisymmetric container and showed that the pure fluid layer on the inclined wall is not thin.

TL;DR: In this paper, an area-averaged two-fluid model formulation of a separated two-phase flow system is used to investigate interfacial stability of liquid film flows, taking into account the effects of phase change at the interface as well as the dynamic effects of the adjacent vapor flow on the interfacial stabilisation.

TL;DR: In this paper, a separated two-component flow model is presented which includes virtual mass forces coupling the momentum equations of the two components, and four real roots of the characteristics determinant can exist.

TL;DR: In this article, the stability conditions of a self-control system with a single-phase flow of an ideal incompressible liquid were investigated under the assumption that the expasion of gas bubbles during their lift is independent of the relative velocity of the gas bubbles and the liquid.