Computational Fluid Dynamics Simulation Approach for Scrubber Wash Water pH Modelling

Ristea, Marian; Popa, Adrian; Scurtu, Ionuţ Cristian

doi:10.3390/en15145140

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…The k-ε model was used to simulate the water flow through the self-excited pulse head. This model was used to simulate turbulent flows [33,34,35] and can be used to confirm the formation of vortices [36, 37, 38, 39]. Its basic assumption is isotropic turbulent viscosity.…”

Section: Flow Simulation Methodsmentioning

confidence: 99%

Assessment of the effectiveness of high-pressure water jet machining generated using self-excited pulsating heads

Szada-Borzyszkowska,

Kacalak,

Banaszek

et al. 2024

Preprint

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The article provides a analysis of pulsating water jets, utilizing three distinct head models. It research the impact of tool geometry on water velocity and pressure scientifically. The emergence of vortices due to increased flow through additional holes is identified as the primary cause of the observed pulsations. Laboratory tests contributed measured impulses at various pressures, revealing a direct correlation between longer impulses (ranging from 15 mm to 60 mm) and increased erosion potential. Notably, at 35 MPa, longer impulses exhibited a minor decrease in force deviation by 0.068. Additionally, the research indicates that pressure variations affect impulse frequencies: 0.55 ms at 15 MPa and approximately 1 ms at higher pressures, highlighting the dynamic nature of water streams based on applied pressures. The study emphasizes the exploitable aspects of self-excited pulsating heads, meticulously examining their design, parameter variations, and their impact on impulse generation. Such comprehensive research serves as a fundamental for enhancing the efficiency of surface pulsating water jet.

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Section: Flow Simulation Methodsmentioning

confidence: 99%

Assessment of the effectiveness of high-pressure water jet machining generated using self-excited pulsating heads

Szada-Borzyszkowska,

Kacalak,

Banaszek

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…For overboard discharge points, qualification can be done in two ways: (i) by sampling and measurement or (ii) by using a numerical hydrodynamic model (e.g., computational fluid dynamics). The checks require predetermined test conditions, such as the highest engine load, maximum sulfur fuel oil, and different washwater flows . Moreover, the alkalinity of the reference water for the test should be 2200 μmol/L or pH 8.2 .…”

Section: Scrubber Emissionsmentioning

confidence: 99%

“…The checks require predetermined test conditions, such as the highest engine load, maximum sulfur fuel oil, and different washwater flows. 141 Moreover, the alkalinity of the reference water for the test should be 2200 μmol/L or pH 8.2. 140 The disruptive effect of scrubber discharge on water alkalinity in harbors is now proven.…”

Section: Separation Technologies Suitable Formentioning

confidence: 99%

Mitigation of Ship Emissions: Overview of Recent Trends

Sarbanha

Larachi

Taghavi

et al. 2023

Ind. Eng. Chem. Res.

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The urgency of reducing flue gas pollution in maritime transport makes it necessary to take a holistic view of its sustainability and environmental impacts. Among the approaches to reducing ship exhaust emissions, marinized gas scrubbers, given their ability to be retrofitted to existing ships, are a central element in the tradeoff against the use of expensive low-sulfur fuels. However, compounding this issue, the priority of reducing greenhouse gas (GHG) emissions in the coming decades poses new challenges to emissions compliance. The use of exhaust gas cleaning systems to remove SO X , NO X , and particulate matter (PM) emissions will be enhanced in the short to medium term by GHG reductions. In this study, the different types of scrubbers for seaborne operation and the potential risks associated with their secondary emissions will be critically reviewed. In addition, NO X reduction systems and recent efforts to reduce CO 2 through onboard carbon capture systems or alternative fuel combustion will also be covered.

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Assessment of the effectiveness of high-pressure water jet machining generated using self-excited pulsating heads

Szada-Borzyszkowska,

Kacalak,

Banaszek

et al. 2024

Int J Adv Manuf Technol

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The article presents the research findings on the process of machining with a pulsating water jet. The study determined the influence of water velocity and pressure, providing insights into the dynamics of pulsating water jets. An evaluation of the generation process of pulsating water jets was conducted for various models of self-excited pulsating heads. The aim was to determine the impact of geometric parameters of the self-excited pulsating head and hydrodynamic working conditions on the performance of such a head, the dynamic characteristics of the water jet it produces, and its technological suitability for material erosion. In the first stage, simulation studies were carried out for three models of self-excited pulsating heads. Based on these studies, a solution with appropriate geometry was selected. Subsequently, experimental studies were conducted using the self-excited head and dedicated research setups. For the selected solution of the self-excited pulsating head, pulse durations, jet thrust forces, and frequency variations for different working pressure values were determined. The analysis showed a correlation between the geometric parameters of the head, pressure changes, and the characteristics of the generated pulses in the pulsed water jets. Pulse generation was made possible by increasing the water flow through side openings. Pulses with greater water volume exhibited increased erosive potential, particularly noticeable at higher pressures. It was found that pressure changes also affect the pulse frequency, with shorter intervals observed at lower pressures and longer intervals at higher pressures. The results presented in the paper highlight the importance of tool geometry and changes in water pressure at the inlet to the self-excited pulsating heads and the dynamics of the pulsed water jet. Research on the pulse generation mechanism and the assessment of erosive potential can form the basis for optimizing the design and operation of pulsating water jets in surface machining. This comprehensive understanding underpins the enhancement of efficiency and effectiveness of pulsating water jet applications in various industrial and manufacturing processes.

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Computational Fluid Dynamics Simulation Approach for Scrubber Wash Water pH Modelling

Cited by 3 publications

References 10 publications

Assessment of the effectiveness of high-pressure water jet machining generated using self-excited pulsating heads

Assessment of the effectiveness of high-pressure water jet machining generated using self-excited pulsating heads

Mitigation of Ship Emissions: Overview of Recent Trends

Assessment of the effectiveness of high-pressure water jet machining generated using self-excited pulsating heads

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