Oil–water two-phase flow-induced vibration of a cylindrical cyclone with vortex finder

Hu, Chen; Liu, Shuo; Zhang, Jian; Xu, Jing-yu

doi:10.1063/5.0140066

Cited by 8 publications

(1 citation statement)

References 37 publications

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“…Theoretical investigations were carried out for impact of superficial velocities and film thickness on pressure drop in two-phase flow [13]. However, these studies did not focus their investigation on elbows as U-bend consists of two 90° elbows.…”

Section: Introductionmentioning

confidence: 99%

Two-phase Upward Flow-Induced Vibrations in U-bend under Different Orientations

Muhammad Sohail,

William Pao,

Huzaifa Azam

et al. 2024

ARFMTS

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U-bends are frequently employed in industries to change the direction of fluid flow. Flow Induced Vibrations (FIV) are very prominent due to internal two-phase flow and vary with U-bend orientation. Potential possibilities of spatial orientations of a U-bend make it impractical to predict these vibrations using an experimental approach. This study investigates the two-phase flow-induced vibrations for 0°, 30°, 60° and 90° upward flow in a U-bend using CFD. In-plane and out-of-plane directional vibrational data was gathered for these four orientations of U-bend. For constant superficial velocities with void fraction of 0.5, impact of orientation on slug frequencies was observed with Fast Fourier Transformation. In-plane (x-axis) forces applied at the outlet bend significantly increase 39% compared to the corresponding forces at the inlet bend. Forces at the outlet bend along the y-axis (out-of-plane) were reduced by 26%, but the forces along the z-axis show a more moderate decrease of 7%. This study provides significant data essential to forming a correlation of two-phase flow-induced vibrations with multiple upward flow U-bend orientations.

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Section: Introductionmentioning

confidence: 99%

Two-phase Upward Flow-Induced Vibrations in U-bend under Different Orientations

Muhammad Sohail,

William Pao,

Huzaifa Azam

et al. 2024

ARFMTS

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A novel one-step simplified lattice Boltzmann method and its application to multiphase flows with large density ratio

2023

Physics of Fluids

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Recently, a one-step simplified lattice Boltzmann method abandoning the original predictor–corrector scheme has been proposed for single-phase flows. In this method, the information of non-equilibrium distribution function (DF) is implicitly included in the difference of two equilibrium DFs at two different locations and time levels. Due to this treatment, the one-step method faces challenges such as extra virtual memory cost and additional boundary treatments. To overcome these drawbacks, a novel one-step simplified lattice Boltzmann method (NOSLBM) is developed by directly constructing the non-equilibrium DF with macroscopic variables. The NOSLBM preserves the merits of high computational efficiency and simple code programming in the original one-step method. Moreover, the present method is extended to multiphase flows. One NOSLBM for the solution of the Cahn–Hilliard equation is employed to capture the interface. Another one is adopted to solve the Navier–Stokes equations for the hydrodynamic fields. Numerical tests about interface capturing and single-phase flows indicate that the present method has a better performance on computational efficiency than that of the simplified multiphase lattice Boltzmann method (SMLBM), in which the predictor–corrector scheme is applied. Numerical tests about binary fluids with large density ratio imply the great accuracy and numerical stability of the present method.

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Modeling and simulation of gas vortex flow dynamics to understand the nature of mass transfer enhancement

2023

Physics of Fluids

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Vortex flow has been demonstrated to be an effective way of process intensification for interphase mass transfer. However, the underlying principles of this phenomenon are not yet fully known. To understand the nature of gas vortex flow in improving process intensification from a fluid flow perspective, this work conducts an experimental investigation and numerical simulations to compare the differences in energy loss, static pressure, main velocity, and turbulent kinetic energy between the vortex and the axial gas flow inside a countercurrent contactor operated at a flow rate of 50–250 L/min. The results indicate that the energy loss increases with increasing gas flow rate, while the Euler number remains stable at 2.49 ± 0.17, which is 21.05% higher than the conventional axial flow. The vortex flow displays higher values and gradients in the distribution of static pressure, tangential, axial velocity, and turbulent kinetic energy, which is directly linked to the enhanced interphase contact, mixing, and mass transfer processes. Additionally, the tangential velocity of vortex flow exhibits a decaying behavior, but it also has an extra tangential dimension, which was a critical factor for process enhancement compared to conventional axial flow. Moreover, semi-empirical models are developed to characterize the parameters of the maximum tangential velocity and its radial position for the vortex flow with R2 = 0.892 and 0.919, respectively. The results may provide a positive reference for the design, optimization, and operation of countercurrent vortex contactors.

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Oil–water two-phase flow-induced vibration of a cylindrical cyclone with vortex finder

Cited by 8 publications

References 37 publications

Two-phase Upward Flow-Induced Vibrations in U-bend under Different Orientations

Two-phase Upward Flow-Induced Vibrations in U-bend under Different Orientations

A novel one-step simplified lattice Boltzmann method and its application to multiphase flows with large density ratio

Modeling and simulation of gas vortex flow dynamics to understand the nature of mass transfer enhancement

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