Abstract
Experiments of gas–liquid flow in a circular pipe for horizontal and inclined positions (upward/downward) are reported. The characteristics of two-phase flow in terms of liquid holdup (ε(L)) and induced flow patterns are studied using three experimental techniques; time-averaged ε(L) from permittivity profiles using electrical capacitance tomography (ECT), instantaneous ε(L) using two fast-closing valves (TFCV), and high-speed camera images (HSCI) to capture/identify the formed flow patterns. Thus, this experimental setup enables the development of more well-defined flow patterns in gas–liquid two-phase flow and allows for multi-technique verification of the results. Taken from experimental measurements, a model is proposed to predict ε(L) for high and low situations. The correlations are a function of the hydrodynamic dimensionless quantities which provide hydrodynamic similarity. Regarding different pipe orientations, ε(L) predictions are comparable to ε(L) from experimental measurements with accepted accuracy: 88% of the predictions are within ±5–15% and 98% are below ±20%. The correlations also were validated by reported results and against correlations available in the literature and show higher prediction accuracy. It is confirmed that the kinematic similarity which is achieved by the gas–liquid velocity ratios and the inertial forces influence the flow pattern and the liquid holdup.
Highlights
The Multiphase flow can be defined as the simultaneous existence of dynamic flow in several phases [1]
The two main forces operating on a gas–liquid multiphase flow system are the inertial at high velocities
Examination of two-phase gas/liquid flow was performed at three pipe inclinations in an Examination of two-phase gas/liquid flow was performed at three pipe inclinations in an experimental flow rig, using an eight-electrode capacitance sensor, an high-speed camera images (HSCI) and two fast-closing valves (TFCV) to measure ε(L)
Summary
The Multiphase flow can be defined as the simultaneous existence of dynamic flow in several phases [1]. Slug flow patterns are characterized oil phases for horizontal pipe of for the cited correlations depend on the inertial combined effect of by proposed by (1984), Hamersma and. Reynold relation number between two forces are number and electric tomography), tothese ε(L)and by means oforientation twointechniques ε with high accuracy as a function of the hydrodynamics non-dimensional prop techniques sensors), and (iii) to develop an empirical correlation that predicts conditions. A multiphase flow rig with adjustable pipe orientations is capable of generating a wide model is proposed which is based on in the this relation work between a model the is proposed liquid which is based on the relation between the liquid and ECT sensors), and (iii) to develop an empirical correlation that predicts ε(L) with high accuracy as εa(L)function with high asof a function of the hydrodynamics non-dimensional properties of phases.
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