Abstract
As two important parameters, the velocity of disturbance wave and the wall shear stress in annular flow are very important to solve the closed equations of the mechanical model for annular flow. In this study, the disturbance wave velocity and wall shear stress of annular flow in a vertical narrow rectangular channel with a cross section of 70 mm × 2 mm were studied. According to the experimental results, it is found that the wave velocity and wall shear stress of disturbance wave increase with increasing gas phase velocity and liquid phase velocity. Also, existing correlations for predicting the velocity of disturbance wave were summarized and evaluated using the current experimental data. A new correlation for wall shear stress based on the disturbance wave velocity has been proposed. Compared with the existing correlation for predicting wall shear stress, this new correlation can well predict the current experimental data and MAPE is only 7.32%.
Highlights
As an important gas-liquid two-phase flow pattern, annular flow is common in modern industrial production processes.e annular flow is mainly composed of liquid film close to the tube wall, gas core, and liquid droplets in the gas core.e gas-liquid interface is not smooth and there are waves of different sizes
Disturbance Wave Velocity. rough high-speed photography, it can be seen that the appearance of disturbance wave is accompanied by the change of liquid color
It can be seen from the figure that the new correlation can well predict the wall shear stress, all data are within the error band of ±18%, and MAPE is only 7.32%
Summary
As an important gas-liquid two-phase flow pattern, annular flow is common in modern industrial production processes. Azzopardi [1] measured the disturbance wave velocity of annular flow in a vertical tube with an inner diameter of 31.8 mm by using the conductivity method. Wang et al [6] proposed an improved disturbance wave velocity correlation in their work, which takes into account the influence of pressure. Lin et al [8] studied the disturbance wave behavior of annular flow in a vertical circular pipe with an inner diameter of 20 mm by Science and Technology of Nuclear Installations using high-speed camera and image processing technology. The disturbance wave velocity was measured and analyzed under the condition of normal temperature and atmospheric pressure
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