A Preliminary Numerical Approach for the Study of Compressed Air Injection in Inverted Siphons

Diogo, A. Freire; Oliveira, Maria Clara

doi:10.1061/(asce)hy.1943-7900.0000702

Cited by 7 publications

(2 citation statements)

References 29 publications

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“…As future work, real testing in the WWTP plant will be conducted to further validate the performance of the proposed solution. Another issue to take into consideration is the application of the proposed methodology for aerobic conditions maintenance in sewer networks [22].…”

Section: Discussionmentioning

confidence: 99%

Economic Reliability-Aware MPC for Operational Management of Flow-Based Networks using Bayesian Networks

Pedrosa

Puig

Nejjari

2022

2022 30th Mediterranean Conference on Control and Automation (MED)

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Section: Discussionmentioning

confidence: 99%

Economic Reliability-Aware MPC for Operational Management of Flow-Based Networks using Bayesian Networks

Pedrosa

Puig

Nejjari

2022

2022 30th Mediterranean Conference on Control and Automation (MED)

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“…Sulfide control may be particularly important in large systems and/or hot climates. For more information, we highly encourage the readers to refer to [48,49]. It worth mentioning that the proposed model for sewage collection systems design in [15] included suitable pumping systems or lift stations and that the costs associated with WWTPs is deterministic, efficient, and very fast, at least when the hydraulic simulations in unsteady flow are not considered or coupled with the design hydraulic model in steady uniform flow.…”

mentioning

confidence: 99%

Integrating Structural Resilience in the Design of Urban Drainage Networks in Flat Areas Using a Simplified Multi-Objective Optimization Framework

Bakhshipour

Hespen

Haghighi

et al. 2021

Water

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Structural resilience describes urban drainage systems’ (UDSs) ability to minimize the frequency and magnitude of failure due to common structural issues such as pipe clogging and cracking or pump failure. Structural resilience is often neglected in the design of UDSs. The current literature supports structural decentralization as a way to introduce structural resilience into UDSs. Although there are promising methods in the literature for generating and optimizing decentralized separate stormwater collection systems, incorporating hydraulic simulations in unsteady flow, these approaches sometimes require high computational effort, especially for flat areas. This may hamper their integration into ordinary commercially designed UDS software due to their predominantly scientific purposes. As a response, this paper introduces simplified cost and structural resilience indices that can be used as heuristic parameters for optimizing the UDS layout. These indices only use graph connectivity information, which is computationally much less expensive than hydraulic simulation. The use of simplified objective functions significantly simplifies the feasible search space and reduces blind searches by optimization. To demonstrate the application and advantages of the proposed model, a real case study in the southwest city of Ahvaz, Iran was explored. The proposed framework was proven to be promising for reducing the computational effort and for delivering realistic cost-wise and resilient UDSs.

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Self-cleansing velocity in upward three-phase steady pipe-flow

Diogo¹,

Moura²

2023

Environ Fluid Mech

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The solids transport and the conditions required to begin the transport of granular particles, or to avoid their deposition, in three-phase turbulent flows of mixtures of gas–liquid–solids, in upward inclined pipes, are complex phenomena whose governing equations and corresponding solutions can be approximated via experimental investigation and numerical computation. An experimental installation for establishing steady flow conditions of air–water-solids in an upward transparent acrylic pipe of 84 mm was built and prepared to allow the measurement of the transported flow rates of air, water, sand and fine gravel, with particle diameters between 0.425 and 7.20 mm. Two full set of experiments with water-solids, and air–water-solids, under comparable conditions, were performed in Laboratory, in order to analyse the influence of the gas phase. Three pipe angles between 30° and 58°, and four solid particle ranges with intermediate sizes forming a bed were tested. The average water superficial velocity demonstrates to be the most relevant variable for the solids transport beginning, and the presence of air has a positive influence, even without the mobilisation of the water flow rate increase due to air-lift pumping. A model relating a modified Shields parameter (Shmixc) with a modified Reynolds number of the particles (Remixc), both defined for the critical average flow rates of three-phase mixtures under steady flow, for which a residual mass of solid particles begins to be transported, is proposed. The resulting equation follows a power law of the generic type Shmixc = a Remixc−b, where a and b are positive constants experimentally obtained for the different angles of inclination of the upward pipe, with coefficients of determination well above 90%. The mathematical model proposed in this work allows the explicit computation of the self-cleansing velocity required for two-phase flows. The critical average air superficial velocity and subsequent average velocity of the mixture required for the solids transport in steady three-phase flows, when the average water superficial velocity is below the two-phase self-cleansing velocity, are computed using the proposed model by numerical iterative processes.

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A Preliminary Numerical Approach for the Study of Compressed Air Injection in Inverted Siphons

Cited by 7 publications

References 29 publications

Economic Reliability-Aware MPC for Operational Management of Flow-Based Networks using Bayesian Networks

Economic Reliability-Aware MPC for Operational Management of Flow-Based Networks using Bayesian Networks

Integrating Structural Resilience in the Design of Urban Drainage Networks in Flat Areas Using a Simplified Multi-Objective Optimization Framework

Self-cleansing velocity in upward three-phase steady pipe-flow

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