Gas–liquid pressure drop in vertical internally wavy 90° bend

Benbella, Shannak; Al-Shannag, Mohammad; Al-Anber, Zaid Ahmed

doi:10.1016/j.expthermflusci.2008.10.004

Cited by 26 publications

(13 citation statements)

References 12 publications

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“…Chisholm [6] presented another model for prediction of two phase pressure drop in bends, based on Φ2LA, for all pipe diameters, bend radius ratios (R/d) and different flow rates. Shannak Benbella [7] reported that total pressure drops in internally wavy pipe bends are approximately 2 -5 times higher than those in smooth bends.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis of Single and Multiphase Flow Characteristics in Elbow

Mazumder

2012

ENG

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Computational fluid dynamics (CFD) analysis of single- phase and two-phase flow was performed in a 90 degree horizontal to vertical elbow with 12.7 mm inside diameter. Characteristic flow behavior was investigated at six different upstream and downstream locations of the elbow. To evaluate the effects of different phases, three different air veloci-ties and three different water velocities were used during this study. Commercial CFD code FLUENT was used to perform analysis of both single and multiphase flows. Pressure and velocity profiles at six locations showed an increase in pressure at the elbow geometry with decreasing pressure as fluid leaves from the elbow. Pressure drop behavior observed to be similar for single-phase and multiphase flows. Comparison of CFD results with available empirical models showed reasonably good agreement

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Section: Introductionmentioning

confidence: 99%

CFD Analysis of Single and Multiphase Flow Characteristics in Elbow

Mazumder

2012

ENG

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“…phase pressure drop in bends, based on Φ 2 LA , for all pipe diameters, bend radius ratios (R/d) and different flow rates. Shannak Benbella reported that total pressure drops in internally wavy pipe bends are approximately 2-5 times higher than those in smooth bends.…”

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confidence: 99%

CFD Analysis of Two-Phase Flow Characteristics in a 90 Degree Elbow

Mazumder

Siddique

2011

The Journal of Computational Multiphase Flows

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Computational fluid dynamics (CFD) analysis was performed for a two-phase air-water flow through a horizontal to vertical 90 0 elbow with a 12.7 mm pipe diameter. Three different air velocities of 15.24, 30.48, and 45.72 m/sec along with three different water velocities of 0.1, 1.0, and 10.0 m/sec were used in this study. To analyze the flow behavior in the elbow, pressure and velocity profiles at six different upstream and downstream locations of the elbow were compared. Computational fluid dynamics (CFD) analysis was performed for 9 different cases using FLUENT commercial code. A mixture model was used to account for different gas and liquid velocities to solve continuity, momentum and energy equations. CFD analysis results showed a decrease in pressure as fluid leaves the elbow in addition to a larger pressure drop at higher air velocities. No significant change in pressure was observed when water velocity was increased from 0.1 to 1.0 m/sec compared to water velocity change from 1.0 to 10.0 m/sec. The normalized pressure drop was larger at lower air velocities compared to higher water velocities. CFD analysis results were compared with available experimental data showing a reasonably good agreement. 1. INTRODUCTION Two-phase flow phenomenon occurs in various industrial applications such as aerospace, automotive, nuclear, oil and gas applications, etc. Due to the unavailability of classical equations to determine the complex flow behaviors associated with two-phase flow, it is important to predict the characteristic behavior of these types of flows. The complexity increases when flow direction changes due to varying interfacial stresses and unstable phase distributions in the flow domain. Among different applications, curved pipes or elbows are commonly used in heating and refrigeration system to transfer heat from one fluid to another. The pressure and velocity distributions at different spatial locations of the piping system are critical for effective heat transfer, mixing and circulation. Single-phase pressure drop can be predicted with reasonable accuracy for curved pipes [1]. Prediction of two-phase pressure drop in curved pipes and bends is quite complex, due to differences in fluid densities, viscosities, phase transformations and their interactions with the surrounding wall. Two-phase flow is a special type of multiphase flow, where fundamental principles of fluid mechanics can be used by adding characteristic equations. The frictional pressure drop in the bend is primarily due to the resistance to flow imposed by the walls of the tubes on the respective phases and the interaction between the phases. Often, one or more of these parameters are not known, due to the difficulty in fully describing the respective flow mechanisms at the different operating conditions [2]. The work presented here will use the computational fluid dynamics (CFD) approach to simulate the pressure drop and velocity distributions in a 90 degree elbow for air-water two phase flow. Detailed studies of two-phase pressure drop have l...

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“…Reference [19]- [21] proposed empirical equation for flow parameters of non-circular duct. The effect of different internal waviness in the vicinity of a 90 o bend for different curvature radius had been studied previously [22]. Empirical correlation has been proposed by the authors for flow characteristics of an internally wavy bend.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Flexible Hose for Reducing Flow Maldistribution in Manifolds

2019

IJRTE

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Coolant Distribution Systems (CDS) are required to be optimally designed to ensure predefined mass flow rate in all parallel channels between exit and collecting manifolds, while maintaining low-pressure drop across them. Even small change in the pressure drop at component level will result in maldistribution of flow rate and increase in overall pressure drop of CDS. Numerical and experimental study had been carried out in the work proposed for change in pressure drop due to deformation of end connector’s bend cross section, in a flexible hose. The methodology for optimum modelling of the problem on CFD tool using sub-structuring method is also suggested. In sub-structuring method a part of complete hose (henceforth referred as sub-structured model), has been used instead of complete model of flexible hose. Results of sub-structuring model were compared with that of a complete model of a flexible hose. Numerical values obtained from simulation were validated with experimental results. Optimum bend cross section for avoiding maldistribution in parallel channels and increase in pressure drop of CDS were calculated. Substantial reduction in computation cost was achieved with negligible loss of accuracy in pressure drop values.

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Gas–liquid pressure drop in vertical internally wavy 90° bend

Cited by 26 publications

References 12 publications

CFD Analysis of Single and Multiphase Flow Characteristics in Elbow

CFD Analysis of Single and Multiphase Flow Characteristics in Elbow

CFD Analysis of Two-Phase Flow Characteristics in a 90 Degree Elbow

Optimization of Flexible Hose for Reducing Flow Maldistribution in Manifolds

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