An Experimental Approach Regarding the Sewage Self-Cleansing Conditions

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

doi:10.1016/j.egypro.2015.12.244

Cited by 7 publications

(5 citation statements)

References 3 publications

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“…The water is pumped from the tank (1) towards the tank (5). This one is a free surface tank and from here we obtain a free surface flow through the main poly acrylate pipe from the tank (5) towards the tank (1). The flow rate is determined with an ultrasonic flow meter (6) and it may be varied using a regulation valve.…”

Section: Methodsmentioning

confidence: 99%

“…Studies of our colleagues [1,2] regarded for instance the flow characteristics of artificially roughened channels simulating deposits on sewer pipes. Other studies where interested on the flow around bodies immersed near the free surface of the channel [3].…”

Section: Introductionmentioning

confidence: 99%

“…In these two examples is impossible to insure illumination through the bottom of the channel. During an experimental campaign related to an extension of the analysis performed in [1,2], we wanted to check the influence of the illumination on the velocity fields distribution, through the bottom of the channel or through the free surface, on a very simple flow on a plane plate placed on the bottom of a circular channel (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Influence of illumination and tracers on Particle Image Velocimetry measurements on open flow channels

Năstase¹,

Mihnea²,

Iliescu³

et al. 2021

RRIC/RJCE

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Within the study of free surface flows, measurements in the vertical planes of the flow are desired. Using Particle Image Velocimetry, usually measurements are performed with the laser sheet through the bottom of the channel in order to avoid the optical perturbations on the laser light sheet, generating light scattering and measurement artefacts. There are however a number of cases where this is not possible since the transparence of the bottom cannot be ensured. In the present study we wanted to check the influence of the illumination on the velocity fields distribution, through the bottom of the channel or through the free surface, on a very simple flow on a plane plate placed on the bottom of a circular channel. We also checked the influence on using conventional silver hollow glass spheres and fluorescent particles. The results allowed us to conclude that in the cases where the study is focused on the boundary layer close to the solid surface and the observed perturbations of the free surface are not important, top illumination of the open channel might be considered as an option if perturbations of the free surface are not observed.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of illumination and tracers on Particle Image Velocimetry measurements on open flow channels

Năstase¹,

Mihnea²,

Iliescu³

et al. 2021

RRIC/RJCE

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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

Dancă

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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“…The deflection remarked in the existing assessment methods can be assigned to the subjective decision and not considering the influence of parameters on the output from the plant. [4] Iliescu et al [5] also focused on self-cleansing conditions which have to be satisfied in order to ensure the good exploitation of sewage system. They specified that the minimum velocity 0.7 ms -1 have to be ensured in order to maintain sewage self-cleansing, no matter the pipe diameter and material.…”

Section: Introductionmentioning

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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An Experimental Approach Regarding the Sewage Self-Cleansing Conditions

Cited by 7 publications

References 3 publications

Influence of illumination and tracers on Particle Image Velocimetry measurements on open flow channels

Influence of illumination and tracers on Particle Image Velocimetry measurements on open flow channels

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

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

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