Laminar Pipeline Flow of Wastewater Sludge: Computational Fluid Dynamics Approach

Bechtel, Tom B.

doi:10.1061/(asce)0733-9429(2003)129:2(153)

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…The model are solved using the Crank‐Nicolson implicit finite difference method as described by Bechtel (2003) for the laminar flow case. At each axial grid point, the finite difference equations are solved implicitly for the unknown velocities at each radial grid point using values of the system variables at the previous grid points.…”

Section: Methodsmentioning

confidence: 99%

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A Computational Technique for Turbulent Flow of Wastewater Sludge

Bechtel¹

2005

Water Environment Research

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A computational fluid dynamics (CFD) technique applied to the turbulent flow of wastewater sludge in horizontal, smooth-wall, circular pipes is presented. The technique uses the Crank2Nicolson finite difference method in conjunction with the variable secant method, an algorithm for determining the pressure gradient of the flow. A simple algebraic turbulence model is used. A Bingham-plastic rheological model is used to describe the shear stress/shear rate relationship for the wastewater sludge. The method computes velocity gradient and head loss, given a fixed volumetric flow, pipe size, and solids concentration. Solids concentrations ranging from 3 to 10% (by weight) and nominal pipe sizes from 0.15 m (6 in.) to 0.36 m (14 in.) are studied. Comparison of the CFD results for water to established values serves to validate the numerical method. The head loss results are presented in terms of a head loss ratio, R hl , which is the ratio of sludge head loss to water head loss. An empirical equation relating R hl to pipe velocity and solids concentration, derived from the results of the CFD calculations, is presented. The results are compared with published values of R hl for solids concentrations of 3 and 6%. A new expression for the Fanning friction factor for wastewater sludge flow is also presented. Water Environ. Res., 77, 417 (2005).

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Section: Methodsmentioning

confidence: 99%

“… Bechtel (2003) has applied computational fluid dynamics (CFD) to laminar pipeline flow of wastewater sludge. Maeda (1988) , Maeda and Matsunaga (1989) , Malin (1997) , Savvas et al (1994) , and Hammad (2000) have applied CFD to Bingham‐plastic fluids and other non‐Newtonians for pipeline flow.…”

Section: Introductionmentioning

confidence: 99%

A Computational Technique for Turbulent Flow of Wastewater Sludge

Bechtel¹

2005

Water Environment Research

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“…It provides the possibility and commercial application value of sludge mixing in MSW incinerator.Computational fluid dynamics (CFD) is widely used in the design and operation optimization of large-scale combustion equipment, including waste incinerator and coal-fired boiler [8,9]. The CFD technique has unique advantages over the analytical calculations, including ease of use, time efficiency, and the ability to readily change [10][11][12][13]. In brief, the research of scholars shows that the coincineration of sludge and garbage has a perspective future.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of co-incineration of sewage sludge and municipal solid waste in municipal solid waste incinerator

Wang

Liao

et al. 2020

E3S Web Conf.

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Incineration is widely used as an important method of sludge and garbage utilization and harmless treatment. The simulations of co-incineration of sludge and municipal solid waste are conducted by computational fluid dynamics method(CFD) in a MSW incinerator. The study focuses on the effect of mixing proportion, moisture content of sludge, excess air coefficient and primary and secondary air distribution ratio on the combustion progress. Simulation results indicate that the combustion temperature of furnace decreases rapidly with the increase of the mixing proportion and moisture content of sludge, which is mainly because the moisture content of sludge is higher than that of MSW as well as its low calorific value. As a result, it is recommended that the water content and mixing ratio of sludge would be controlled below 40% and 7% respectively. Therefore, the fresh sludge should be dried before entering the furnace.

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Case Study: Refinement of Hydraulic Operation of a Complex CSO Storage/Treatment Facility by Numerical and Physical Modeling

Maršálek

Rochfort

et al. 2006

J. Hydraul. Eng.

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Laminar Pipeline Flow of Wastewater Sludge: Computational Fluid Dynamics Approach

Cited by 5 publications

References 13 publications

A Computational Technique for Turbulent Flow of Wastewater Sludge

A Computational Technique for Turbulent Flow of Wastewater Sludge

Numerical simulation of co-incineration of sewage sludge and municipal solid waste in municipal solid waste incinerator

Case Study: Refinement of Hydraulic Operation of a Complex CSO Storage/Treatment Facility by Numerical and Physical Modeling

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