Numerical Study for Open-channel Flow over Rows of Hemispheres

Iatan, Elena Luisa; Iliescu, Marius; Bode, Florin; Năstase, Ilinca; Damian, Radu Mircea; Sandu, Mihnea

doi:10.1016/j.egypro.2015.12.242

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…[9] The model of the studied geometry is presented in Figure 3, and the affected areas in Figure 4. Wall shear stress is an important parameter when studying material deposition on the bottom of the waste water treatment well or sewage pipes [10,11].…”

Section: Simulation Model and Methodsmentioning

confidence: 99%

Solutions for increasing the quality of hydro-technical building elements obtained by numerical simulation

et al. 2019

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Sewage treatment remains a delicate subject and requires technical improvements to increase the efficiency of the systems responsible for the treatment. Numerical simulations are also a very useful tool, especially if they are used during the design phase. Thus, the paper aims to present the results obtained by CFD numerical simulations in the case of an important element within an existing wastewater treatment plant, namely the waste water treatment well, thus obtaining constructive solutions of a better functionally to the designed version. Through these, the work demonstrates the necessity of analyzes with CFD methods during design of the main elements of hydrotechnical constructions, but also the necessity of adjusting the numerical models with results obtained from experiments, measurements. The results show that the modifications described in the paper would bring significant improvements in waste disposal.

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Section: Simulation Model and Methodsmentioning

confidence: 99%

Solutions for increasing the quality of hydro-technical building elements obtained by numerical simulation

et al. 2019

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“…Several investigators have worked with numerical methods, simulating the flow through a wind tunnel, and solving the governing equations. Thus, Iatan et al [4] studied the flow of water over a coarse bottom in an open channel. They ensured the coarseness by using rows of hemispheric obstacles and used the DNS and LES method to solve the equations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Three-Dimensional Flow around a Surface-Mounted Rib and the Onset of Unsteadiness

et al. 2023

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The incompressible laminar isothermal flow of a Newtonian fluid at steady state around a surface-mounted rib is studied in a three-dimensional (3D) numerical experiment. The dimensionless Navier–Stokes equations are solved numerically using the Galerkin finite element method for Reynolds numbers 1 to 800. The expansion ratio of the problem is 1:9.6, while the aspect ratio is 1:20. The transition from the steady to the unsteady state and the identification of the critical Reynolds number are investigated in this paper. Numerical results of the skin-friction lines at the bottom and streamlines throughout the computational field are presented. A comparison between the 2D and 3D flow is made to show the effect of the walls on the flow, which reaches the plane of symmetry and affects the flow there; hence, also affecting the stability of the flow. It is concluded that the flow is three-dimensional even for a Reynolds number equal to 10. The critical Reynolds number is 600, and the steady-state equations can be used for any calculations up to this value.

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“…Utilizing non-intrusive techniques, such as PIV measuring techniques, the heat exchange parameters for these types of interfaces might be characterized. There have already been research [14,15] employing PIV experimental studies or numerical approaches [16] concerning the flow pattern across rough surfaces in open channels with applicability to the turbulence raising techniques that can be utilized to improve the heat flux over an interface.…”

Section: Introductionmentioning

confidence: 99%

Advanced solutions to improve heat recovery from wastewater in a double heat exchanger

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Bayati

Năstase

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Reducing energy consumption and CO2 footprint in existing buildings without requiring extensive construction work is one of the biggest challenges facing the globe today. Although heating contributes for the majority of energy use in buildings, residential hot water demand is also relatively high, particularly when daily usage is high and especially for certain applications. The use of technologies that recover energy from sources other than fossil fuels to heat water has grown crucial, and one such technology involves recovering thermal energy from wastewater. Typically, heat recovery from wastewater is made to collect any remaining energy from the hot drainage water, and this energy is then applied to heat pumps or to warm up incoming cold water. The paper presents numerical simulations using a SST k-ω turbulence model in order to compare a regular geometry of heat exchanger with a helicoidal one. The second one provides a more turbulent flow that allows an intensification of the outer flow, thus allowing the enhancement of the heat transfer from the inner heated flow to the outer flow.

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Numerical Study for Open-channel Flow over Rows of Hemispheres

Cited by 10 publications

References 5 publications

Solutions for increasing the quality of hydro-technical building elements obtained by numerical simulation

Solutions for increasing the quality of hydro-technical building elements obtained by numerical simulation

Numerical Investigation of the Three-Dimensional Flow around a Surface-Mounted Rib and the Onset of Unsteadiness

Advanced solutions to improve heat recovery from wastewater in a double heat exchanger

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