Effect of Bubble Size and Angle of Tapering Upriser Pipe on the Performance of Airlift Pumps

Hanafizadeh, Pedram; Saidi, Mohammad Hassan; Karimi, Ali; Zamiri, A.

doi:10.1080/02726351.2010.496300

Cited by 22 publications

(21 citation statements)

References 14 publications

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“…The study concluded that the flow pattern for the highest airlift pump performance was mainly slug flow. In another study, Hanafizadeh et al (2010) made a numerical investigation on the effect of tapering angle (ranging from 0 to 3 degrees) of the riser on the performance of an airlift pump for different submergence ratios and different diameters. It was found that 3 degrees of tapering produced the highest efficiency.…”

Section: Introductionmentioning

confidence: 99%

Air injection methods: The key to a better performance of airlift pumps

Ahmed

Aman

Badr

et al. 2016

Experimental Thermal and Fluid Science

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Section: Introductionmentioning

confidence: 99%

Air injection methods: The key to a better performance of airlift pumps

Ahmed

Aman

Badr

et al. 2016

Experimental Thermal and Fluid Science

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“…Therefore, the improved frictional pressure drop model consists of Equations (7)-(9) and Equation (16).…”

Section: Frictional Pressure Drop Of Vertical Risermentioning

confidence: 99%

“…Computational Fluid Dynamics (CFD) method is a powerful tool to predict the behavior of gas-liquid two-phase flow and is found in a number of engineering applications, for example, porous materials [7,8], petroleum industry [9,10], aerospace industry [11][12][13], and IC systems [14,15]. Hanafizadeh et al [16] used the Eulerian-Eulerian model to study the effect of bubble diameter and tapering angle on performance of airlift pump. The results showed that the liquid mass flow rate increased with the decrease of bubble diameter.…”

Section: Introductionmentioning

confidence: 99%

CFD Study of Gas Holdup and Frictional Pressure Drop of Vertical Riser Inside IC Reactor

et al. 2019

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The internal circulation system in Internal Circulation (IC) reactor plays an important role in increasing volumetric loading rate and promoting the mixing between sludge and wastewater. In order to design the internal circulation system, the flow behaviors of gas-liquid inside vertical riser should be studied in detail. In the present study, the Multiple Flow Regimes model is adopted to capture the phase interface for different flow conditions. The flow patterns, internal circulation flow rate, gas holdup, and frictional pressure drop of vertical riser are investigated. The results show that the bubble flow inside a vertical riser is in a stable flow condition. There exists a maximum value for internal circulation flow rate with the increasing superficial gas velocity. The parameters of Martinelli models for gas holdup and frictional pressure drop are improved based on Computational Fluid Dynamics (CFD) results. The deviations between the calculated gas holdup and frictional pressure drop by improved model and experimental value are reduced to 14% and 13.2%, respectively. The improved gas holdup and frictional pressure drop model can be used for the optimal design of internal circulation system.

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“…where g is the acceleration due to gravity, τ q is the phase stress-strain tensor, F q is an external body force, F lif t,q is the lift force, F vm,q is a virtual mass force, p is the pressure shared by all phases, R pq is the interphase force, and v pq is the interphase velocity. Comprehensive details and empirical correlations for these terms are beyond the scope this work; readers are referred to Hanafizadeh et al (2010) for more information. Because of the continuous motion of the gas phase in the liquid phase and instantaneous mixing of the phases in two-phase flow, turbulence is present in all Re, despite the single-phase flow case.…”

Section: Numerical Approachmentioning

confidence: 99%

Void Fraction and Wake Analysis of a Gas-Liquid Two-Phase Cross-Flow

et al. 2014

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Two-phase cross-flow takes place in a wide range of industrial equipment, including heat exchangers and measurement devices. The aim of this paper is to establish a numerical model and experimental methodology for comprehensive study and visualization of void fraction and wake region in gas-liquid cross-flow over immersed bodies with various cross-section geometries. Conservation of mass and momentum for both-phase free streams, along with constitutive relationships, were used for modeling turbulence. The input parameters for the numerical simulations were two-phase Reynolds number, free-stream void fraction, bubble size in the inlet, and cross-section geometry of prisms inserted in the two-phase flow path. Because the wake region and phase distribution around an immersed object are time-dependent, we report time average values of drag, lift, and pressure coefficients. The results show that drag and lift coefficients are strongly dependent on the two-phase Reynolds number; this dependency is a more moderate function of void fraction. The results are in good agreement with available empirical correlations and experimental work. Furthermore, experiments were conducted to visualize phase distribution and wake region in two-phase cross-flow. Comparison of the experimental and numerical results verifies the developed numerical model.

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Effect of Bubble Size and Angle of Tapering Upriser Pipe on the Performance of Airlift Pumps

Cited by 22 publications

References 14 publications

Air injection methods: The key to a better performance of airlift pumps

Air injection methods: The key to a better performance of airlift pumps

CFD Study of Gas Holdup and Frictional Pressure Drop of Vertical Riser Inside IC Reactor

Void Fraction and Wake Analysis of a Gas-Liquid Two-Phase Cross-Flow

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